This ObjectType defines the super type for all OPC UA ObjectTypes representing BACnet object types in an OPC UA Address Space. It introduces two properties common for all BACnet object types. Figure 10 shows an overview for the BACnetObjectType with its Properties and related ObjectTypes. It is formally defined in Table 8.

Figure 10 – BACnetObjectType overview

The BACnetObjectType is formally defined in Table 8.

Table 8 – BACnetObjectType Definition

Attribute	Value
BrowseName	BACnetObjectType
IsAbstract	True
References		NodeClass	BrowseName	DataType	TypeDefinition	Other
Subtype of the BaseObjectType defined in OPC 10000-5
0:HasProperty		Variable	Object_Identifier	BACnetObjectIdentifier	0:PropertyType	M
0:HasProperty		Variable	Profile_Name	0:String	0:PropertyType	O

The BACnetObjectType is an abstract type and cannot be used directly.

The following BACnet properties are mapped to existing OPC UA Object Attributes.

• Object_Name is mapped to the BrowseName of the OPC UA Object
• Object_Type is mapped to the type definition of the OPC UA Object
• Description is mapped to the OPC UA Attribute Description of the OPC UA Object

This OPC UA Property represents the BACnet property Object_Identifier.

It is the unique address within the BACnet device. It consists of a BACnet object type and instance number. The BACnetObjectIdentifier DataType is defined in 10.2.1.

This OPC UA Property represents the BACnet property Profile_Name.

A profile defines a set of additional properties, behavior, and/or requirements for this object beyond those specified by BACnet.

This ObjectType is used to represent object types not covered by this specification (standard or proprietary object types).

The BACnetObjectTypeUnknown is formally defined in Table 9.

Table 9 – BACnetObjectTypeUnknown Definition

Attribute	Value
BrowseName	BACnetObjectTypeUnknown
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1
0:HasComponent	Variable	Object_Type	BACnetObjectTypeEnum	0:BaseDataVariableType	M

This OPC UA Property, of DataType BACnetObjectTypeEnum, represents the BACnet property Object_Type. The BACnetObjectTypeEnum DataType is defined in 10.4.21.

The property is an enumeration that describes the BACnet object type of the type not covered by this specification. This information is contained in the OPC UA type definition NodeId for the BACnet object types mapped in this specification.

This OPC UA ObjectType represents a BACnet Device object type. There is exactly one BACnetDeviceType in each BACnet Device. The Object_Identifier property of the BACnetDeviceType identifies the device and is unique throughout the BACnet internetwork. This ObjectType exposes standard BACnet services through OPC UA methods. These methods may be invoked to manage the configuration of the BACnet Device.

Figure 11 shows an overview for the BACnetDeviceType with its Properties and related ObjectTypes. It is formally defined in Table 10.

Figure 11 – BACnetDeviceType overview

The BACnetDeviceType is formally defined in Table 10.

Table 10 – BACnetDeviceType Definition

Attribute			Value
BrowseName			BACnetDeviceType
IsAbstract			False
References	Node Class	BrowseName		DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1
0:HasComponent	Object	Object_List			BaseObjectType	M
0:HasComponent	Object	Structured_Object_List			BaseObjectType	O
0:HasComponent	Object	TimeManagement			BACnetTimeManagementType	O
0:HasComponent	Object	BackupRestore			BACnetBackup RestoreType	O
0:HasComponent	Object	MstpMaster			BACnetMstp MasterType	O
0:HasComponent	Object	DeviceRestart			BACnetDevice RestartType	O
0:HasNotifier	Object	<Notifier_Object_Name>			BACnetNotifier Type	OP
0:HasProperty	Variable	System_Status		BACnetDeviceStatus	0:PropertyType	M
0:HasProperty	Variable	Vendor_Name		0:String	0:PropertyType	M
0:HasProperty	Variable	Vendor_Identifier		0:UInt16	0:PropertyType	M
0:HasProperty	Variable	Model_Name		0:String	0:PropertyType	M
0:HasProperty	Variable	Serial_Number		0:String	0:PropertyType	M
0:HasProperty	Variable	Firmware_Revision		0:String	0:PropertyType	M
0:HasProperty	Variable	Application_Software_Version		0:String	0:PropertyType	M
0:HasProperty	Variable	Location		0:String	0:PropertyType	O
0:HasProperty	Variable	Protocol_Version		0:UInteger	0:PropertyType	M
0:HasProperty	Variable	Protocol_Revision		0:UInteger	0:PropertyType	M
0:HasProperty	Variable	Protocol_Services_Supported		BACnetServices SupportedBits	0:PropertyType	M
0:HasProperty	Variable	Protocol_Object_Types_Supported		BACnetObjectType SupportedBits	0:PropertyType	M
0:HasProperty	Variable	Max_APDU_Length_Accepted		0:UInteger	0:PropertyType	M
0:HasProperty	Variable	Segmentation_Supported		BACnetSegmentation	0:PropertyType	M
0:HasProperty	Variable	Max_Segments_Accepted		0:UInteger	0:PropertyType	O
0:HasProperty	Variable	APDU_Segment_Timeout		0:UInteger	0:PropertyType	O
0:HasProperty	Variable	APDU_Timeout		0:UInteger	0:PropertyType	M
0:HasProperty	Variable	Number_Of_APDU_Retries		0:UInteger	0:PropertyType	M
0:HasProperty	Variable	Device_Address_Binding		BACnetAddressBinding[]	0:PropertyType	M
0:HasProperty	Variable	Database_Revision		0:UInteger	0:PropertyType	M
0:HasProperty	Variable	Active_COV_Subscriptions		BACnetCOV Subscription[]	0:PropertyType	O
0:HasComponent	Method	CreateObject				O
0:HasComponent	Method	DeleteObject				O
0:HasComponent	Method	ReinitializeDevice				O
0:HasComponent	Method	DeviceCommunicationControl				O
0:HasComponent	Method	TextMessage				O
0:HasComponent	Method	AddDeviceAddressBindings				O
0:HasComponent	Method	RemoveDeviceAddressBindings				O
0:GeneratesEvent	ObjectType	BACnetNotificationType

The BACnetDeviceType ObjectType is a concrete type and can be used directly.

The components of the BACnetDeviceType have additional subcomponents which are defined in Table 11.

Table 11 – BACnetDeviceType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
Object_List	0:HasProperty	Variable	Object_List	BACnetObjectIdentifier []	0:PropertyType	M
Object_List	0:HasComponent	Object	<BACnetObjectName>		BACnetObjectType	OP
Structured_Object_List	0:HasProperty	Variable	Structured_Object_List	BACnetObjectIdentifier []	0:PropertyType	M
Structured_Object_List	0:HasComponent	Object	<BACnetStructuredView Name>		BACnetStructuredViewType	OP

If the BACnet device object contains BACnet notification class objects, the SubscribeToEvents flag is set in the EventNotifier OPC UA Attribute.

Object_List gathers the references to BACnet objects of the BACnet device provided through the BACnet property Object_List.

The OPC UA Property Object_List on the Object_List object, of DataType BACnetObjectIdentifier[], represents the BACnet property Object_List. The BACnetObjectIdentifier DataType is defined in 10.2.1. It contains a list of BACnet objects within the device.

The list of BACnetObjectTypes on the Object_List object contains the list of BACnet objects within the device. The list may be limited through configuration of the BACnetUaMapper.

Structured_Object_List gathers the references to all BACnet structured view objects of the BACnet device provided through the BACnet property Structured_Object_List.

The OPC UA Property Structured_Object_List on the Structured_Object_List object, of DataType BACnetObjectIdentifier[], represents the BACnet property Structured_Object_List. The BACnetObjectIdentifier DataType is defined in 10.2.1. It contains a list of BACnet structured view objects within the device.

The list of BACnetStructuredViewTypes on the Structured_Object_List object contains the list of BACnet structured view objects within the device. The list may be limited through configuration of the BACnetUaMapper.

This optional OPC UA Object, of type BACnetTimeManagementType, provides localized time and date information to consumers of the device object.

If an automatic time synchronization master is available, the special subtype BACnetAutomaticTimeSynchronizationMasterType is used.

This optional OPC UA Object, of type BACnetBackupRestoreType, provides backup and restore status to consumers of the device object. This status provides information about the last restore time, backup failures, preparation and completion times, and so on.

This optional OPC UA Object, of type BACnetMstpMasterType, describes paramters that are relevant if the device objects functions as a master on an MS/TP network.

This optional OPC UA Object, of type BACnetDeviceRestartType, provides information related to restarting the device. The last restart time and the set of devices that are notified when the device is restarted are provided by this object.

OPC UA Objects that have the EventNotifier Attribute set to SubscribeToEvents are so called event notifiers. They can be used by OPC UA Clients to subscribe for Events from the OPC UA Server. The OPC UA ReferenceType HasNotifier is used to build an event notifier tree starting from the Server Object.

BACnetNotifierType Objects like instances of BACnetNotificationClassTypes are used together with instances of the BACnetDeviceType to represent the OPC UA event notifier hierarchy starting from the Server object.

Figure 12 shows an example of BACnet objects referencing each other with BACnetObjectIdentifiers and the representation with OPC UA Objects and References. The example contains a BACnet Device object, one Analog Input object that creates alarms and therefore references a Notification Class object.

Figure 12 – Event notifiers in BACnet and OPC UA

This OPC UA Property, of DataType BACnetDeviceStatus, represents the BACnet property System_Status. The BACnetDeviceStatus DataType is defined in 10.4.9.

The property is an enumeration that describes the current operating state of the device. Some example states are “operational”, “non-operational”, “backup in progress”, and so forth.

This OPC UA Property, of DataType String, represents the BACnet property Vendor_Name.

This property identifies the manufacturer of the BACnet device.

This OPC UA Property, of DataType UInt16, represents the BACnet property Vendor_Identifier.

This property represents a unique identification code, assigned by ASHRAE. The code is used to identify proprietary extensions to the protocol.

This OPC UA Property, of DataType String, represents the BACnet property Model_Name.

This property identifies the model name of the BACnet device.

This OPC UA Property, of DataType String, represents the BACnet property Serial_Number.

This property identifies the serial number of the BACnet device.

This OPC UA Property, of DataType String, represents the BACnet property Firmware_Revision.

This property identifies the firmware installed in the BACnet device.

This OPC UA Property, of DataType String, represents the BACnet property Application_Software_Version.

This property identifies the application software version installed in the BACnet device.

This optional OPC UA Property, of DataType String, represents the BACnet property Location.

This property identifies the physical location of the BACnet device.

This OPC UA Property, of DataType UInteger, represents the BACnet property Protocol_Version.

This property identifies the major version of the BACnet protocol supported by this device.

This OPC UA Property, of DataType UInteger, represents the BACnet property Protocol_Revision.

This OPC UA Property, of DataType BACnetServicesSupportedBits, represents the BACnet property Protocol_Services_Supported. The BACnetServicesSupportedBits DataType is defined in 10.3.6.

The BACnetServicesSupportedBits identifies the standardized protocol services that are executed by the implementation of the protocol on this device. See the BACnet specification for minimum supported service requirements.

This OPC UA Property, of DataType BACnetObjectTypeSupportedBits, represents the BACnet property Protocol_Object_Types_Supported. The BACnetObjectTypeSupportedBits DataType is defined in 10.3.5.

This property identifies the standardized BACnet object types (like analog inputs, binary outputs, calendars, and so on) that can be represented by this device’s implementation of the BACnet protocol. The minimum set of supported objects shall be at least Analog Input, Analog Output, Analog Value, Binary Input, Binary Output, and Binary Value.

This OPC UA Property, of DataType UInteger, represents the BACnet property Max_APDU_Length_Accepted.

This property describes the maxium number of octets that may be packaged into a single application layer protocol data unit. The data type of this variable is an unsigned integer and its value shall be greater than or equal to 50.

This OPC UA Property, of DataType BACnetSegmentation, represents the BACnet property Segmentation_Supported. The BACnetSegmentation DataType is defined in 10.4.30.

The BACnetSegmentation is an enumeration that indicates whether the BACnet device supports message segmentation and, if so, whether it supports segmented transmission, reception, or both.

This optional OPC UA Property, of DataType UInteger, represents the BACnet property Max_Segments_Accepted.

The Max_Segments_Accepted property indicates the maximum number of segments of an APDU that the device will accept.

This optional OPC UA Property, of DataType UInteger, represents the BACnet property APDU_Segment_Timeout.

The APDU_Segment_Timeout property indicates the amount of time (in milliseconds) between retransmission of an APDU segment. See the BACnet specification for recommended default values and best practices.

This OPC UA Property, of DataType UInteger, represents the BACnet property APDU_Timeout.

The APDU_Timeout property indicates the amount of time (in milliseconds) between retransmissions of an APDU that requires acknowledgement, but for which no acknowledgement has been received. See the BACnet specification for recommended default values and best practices.

This OPC UA Property, of DataType UInteger, represents the BACnet property Number_Of_APDU_Retries.

The Number_Of_APDU_Retries property indicates the maximum number of times that an ADPU is retransmitted. See the BACnet specification for recommended default values and best practices.

This OPC UA Property, containing an array of DataType BACnetAddressBinding, represents the BACnet property Device_Address_Binding. The BACnetAddressBinding DataType is defined in 10.5.3.

The BACnetAddressBinding data type identify the actual device address that will be used when the remote device must be accessed using a BACnet service request. See the BACnet specification for rules related to zero network-number addresses and empty lists.

This OPC UA Property, of DataType UInteger, represents the BACnet property Database_Revision.

The Database_Revision property describes a logical revision number for the device database. The revision is incremented when an object is created, an object is deleted, an object’s name is changed, an object’s Object_Identifier property is changed, or a restore is performed. See the BACnet specification for exceptions.

This OPC UA Property, containing an array of DataType BACnetCOVSubscription, represents the BACnet property Active_COV_Subscriptions. The BACnetCOVSubscription DataType is defined in 10.5.4.

The BACnetCOVSubscription value provides a network-visible indication of those COV subscriptions that are active at any given time. When a COV subscription is created using the BACnet COV subscription services, a ew entry is added to the Active_COV_Subscriptions list. The entry is removed when the subscription is terminated.

This method represents the BACnet service CreateObject. It is used to create a new instance of an object. The BACnet properties of standard objects created with this Method may be initialized in two ways: initial values may be provided as part of the CreateObject Method call or values may be written to the newly created object using OPC UA Write.

Signature

CreateObject (

[in]BACnetObjectIdentifier ObjectSpecifier

[in]0:KeyValuePair[] ListOfInitialValues

);

Argument	Description
ObjectSpecifier	Provides the information about the BACnet object type to be created or the BACnet object identifier if the object to be created. The instance information shall be undefined if only the object type is passed in. The BACnetObjectIdentifier DataType is defined in 10.2.1.
ListOfInitialValues	A list of initial values that shall be used to initialize the values of the specified properties of the newly created object.

Method Result Codes

ResultCode	Description
BadOutOfMemory	This status is returned for the BACnet error code NO_SPACE_FOR_OBJECT
BadNotSupported	This status is returned for the BACnet error code DYNAMIC_CREATION_NOT_SUPPORTED
BadTypeDefinitionInvalid	This status is returned for the BACnet error code UNSUPPORTED_OBJECT_TYPE
BadNodeIdInvalid	This status is returned for the BACnet error code OBJECT_IDENTIFIER_ALREADY_EXISTS
BadTypeMismatch	This status is returned for the BACnet error code INVALID_DATATYPE
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNodeIdInvalid	This status is returned for the BACnet error code UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error code CHARACTER_SET_NOT_SUPPORTED
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadTypeMismatch	This status is returned for the BACnet error code DATATYPE_NOT_SUPPORTED

This method represents the BACnet service DeleteObject. It can be used to delete objects that may be created and deleted dynamically.

Signature

DeleteObject (

[in]BACnetObjectIdentifier ObjectIdentifier

);

Argument	Description
ObjectIdentifier	Specifies the BACnet object to be deleted. The BACnetObjectIdentifier DataType is defined in 10.2.1.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error code UNKNOWN_OBJECT
BadUserAccessDenied	This status is returned for the BACnet error code OBJECT_DELETION_NOT_PERMITTED

This method represents the BACnet service ReinitializeDevice. It is used to instruct a remote device to reboot itself (cold start), reset itself to some predefined initial state (warm start), or to control the backup or restore procedure. Resetting or rebooting a device is primarily initiated by a human operator for diagnostic purposes.

Remark: Since the method contains the Password, this method should only be available if the connection is encrypted.

Signature

ReinitializeDevice (

[in]BACnetReinitializedStateofDevice ReinitializedStateofDevice

[in]0:String Password

);

Argument	Description
ReinitializedStateofDevice	This parameter allows the caller to specify the desired state of the device after its reinitialization. The BACnetReinitializedStateofDevice DataType is defined in 10.4.27.
Password	password parameter.

Method Result Codes

ResultCode	Description
BadInvalidState	This status is returned for the BACnet error code CONFIGURATION_IN_PROGRESS
BadUserAccessDenied	This status is returned for the BACnet error code PASSWORD_FAILURE
BadNoCommunication	This status is returned for the BACnet error code COMMUNICATION_DISABLED

This method represents the BACnet service DeviceCommunicationControl. It is used to instruct a remote device to stop initiating communication and optionally stop responding to communication for a specified duration of time.

Remark: Since the method contains the Password, this method should only be available if the connection is encrypted.

Signature

DeviceCommunicationControl (

[in]0:UInt16 TimeDurationInMinutes

[in]BACnetDeviceCommunicationEnabledEnableDisable

[in]0:String Password

);

Argument	Description
TimeDurationInMinutes	This optional parameter of DataType 0:UInt16 indicates the number of minutes that the remote device shall stop communication. If the parameter is not specified, 0 shall be passed in as value.
EnableDisable	This parameter is an enumeration that may take on the values ENABLE, DISABLE, or DISABLE_INITIATION. It is used to indicate whether the device should enable all, disable initiation, or disable all communications on the network interface. The BACnetDeviceCommunicationEnabled DataType is defined in 10.4.8.
Password	password parameter.

Method Result Codes

ResultCode	Description
BadUserAccessDenied	This status is returned for the BACnet error code PASSWORD_FAILURE
BadNotSupported	This status is returned for the BACnet error code O_FUNCTIONALITY_NOT_SUPPORTED

This method represents the BACnet services ConfirmedTextMessage and UnconfirmedTextMessage.

The UnconfirmedTextMessage service is used by a client BACnet-user to send a text message to one or more BACnet devices. This service may be broadcast, multicast, or addressed to a single recipient. This service may be used in cases where confirmation that the text message was received is not required. Messages may be prioritized into normal or urgent categories. In addition, a given text message may optionally be classified by a numeric class code or class identification string. This classification may be used by receiving BACnet devices to determine how to handle the text message. For example, the message class might indicate a particular output device on which to print text or a set of actions to take when the text message is received. In any case, the interpretation of the class is a local matter.

The ConfirmedTextMessage service is used by a client BACnet-user to send a text message to another BACnet device. This service is not a broadcast or multicast service. This service may be used in cases when confirmation that the text message was received is required. The confirmation does not guarantee that a human operator has seen the message. Messages may be prioritized into normal or urgent categories. In addition, a given text message may be optionally classified by a numeric class code or class identification string. This classification may be used by the receiving BACnet device to determine how to handle the text message. For example, the message class might indicate a particular output device on which to print text or a set of actions to take when the text is received. In any case, the interpretation of the class is a local matter.

Signature

TextMessage (

[in]0:Boolean SendUnconfirmed

[in]BACnetObjectIdentifier TextMessageSourceDevice

[in]BACnetMessageClass MessageClass

[in]BACnetMessagePriority MessagePriority

[in]0:String Message

);

Argument	Description
SendUnconfirmed	Flag indicating if the BACnet service UnconfirmedTextMessage (TRUE) or ConfirmedTextMessage (FALSE) is used.
TextMessageSourceDevice	This parameter, of type BACnetObjectIdentifier, shall convey the value of the Object_Identifier property of the Device object of the device that initiated this text message.
MessageClass	This parameter, if present, shall indicate the classification of the received message. The datatype of this parameter shall be a choice of Unsigned or CharacterString. The interpretation of the meaning of any particular value for this parameter shall be a local matter.
MessagePriority	This parameter, of type ENUMERATED, shall indicate the priority for message handling: {NORMAL, URGENT}
Message	This parameter, of type CharacterString, shall be used to convey the text message.

Method Result Codes

ResultCode	Description
BadUserAccessDenied	This status is returned for the BACnet error code PASSWORD_FAILURE
BadNotSupported	This status is returned for the BACnet error code O_FUNCTIONALITY_NOT_SUPPORTED

This Method adds entries to the BACnet property Device_Address_Binding.

Signature

AddDeviceAddressBindings (

[in]BACnetAddressBinding [] AddressBindings

[out]0:UInt32 FirstFailedElementNumber

);

Argument	Description
AddressBindings	Array of address bindings to add to the entries in the BACnet property Device_Address_Binding. The BACnetAddressBinding DataType is defined in 10.5.3.
FirstFailedElementNumber	The numerical position, starting at 1, of the failed element in the AddressBindings. If the call succeeds or fails for other reasons, the returned value shall be 0.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE and DATATYPE_NOT_SUPPORTED
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadOutOfMemory	This status is returned for the BACnet error code NO_SPACE_TO_ADD_LIST_ELEMENT

This Method removes entries from the BACnet property Device_Address_Binding.

Signature

RemoveDeviceAddressBindings (

[in]BACnetAddressBinding[] AddressBindings

[out]0:UInt32 FirstFailedElementNumber

);

Argument	Description
AddressBindings	Array of address bindings to remove from the entries in the BACnet property Device_Address_Binding. The BACnetAddressBinding DataType is defined in 10.5.3.
FirstFailedElementNumber	The numerical position, starting at 1, of the failed element in the AddressBindings. If the call succeeds or fails for other reasons, the returned value shall be 0.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadNotFound	This status is returned for the BACnet error code LIST_ELEMENT_NOT_FOUND

This OPC UA ObjectType defines the super type for all OPC UA ObjectTypes that represent BACnet Analog object types in an OPC UA Address Space.

Figure 13 shows an overview for the BACnetAnalogType with its Properties and related ObjectTypes. It is formally defined in Table 12.

Figure 13 – BACnetAnalogType overview

The BACnetAnalogType is formally defined in Table 12.

Table 12 – BACnetAnalogType Definition

Attribute		Value
BrowseName		BACnetAnalogType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1
0:HasComponent	Variable		Present_Value	0:Float	0:AnalogUnitType	M
0:HasProperty	Variable		Out_Of_Service	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasProperty	Variable		Resolution	0:Float	0:PropertyType	O
0:HasProperty	Variable		COV_Increment	0:Float	0:PropertyType	O
0:HasComponent	Object		EventReporting		BACnetEventReportingType	O
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluationType	O

The BACnetAnalogType is an abstract type and cannot be used directly.

The components of the BACnetAnalogType have additional subcomponents which are defined in Table 13.

Table 13 – BACnetAnalogType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetOutOfRangeAlgorithmType	M

This OPC UA Variable, of DataType Float, indicates the current value, in engineering units, of the input being measured. The Present_Value Variable shall be writable when Out_Of_Service is true.

This OPC UA AnalogItemType Variable represents the BACnet properties Present_Value, Min_Pres_Value, Max_Pres_Value, Units and Update_Interval. The OPC UA VariableType AnalogItemType is defined in OPC 10000-8. It defines the OPC UA Properties EURange, EngineeringUnits and InstrumentRange.

The following list provides the BACnet property and the mapping to the corresponding data member in the OPC UA AnalogItem.

• Present_Value represented by Value Attribute of the Variable.
• Min_Pres_Value represented by Low part of EURange Property of the Variable. If the optional BACnet property Min_Pres_Value is not present, the EURange Property should not be provided.
• Max_Pres_Value represented by the High part of EURange Property of the Variable. If the optional BACnet property Max_Pres_Value is not present, the EURange Property should not be provided.
• Units represented by the EngineeringUnits Property of the Variable. The mapping of BACnet units to OPC UA units is defined in 11.
• Update_Interval represented by MinSamplingInterval Attribute of the Variable.

This OPC UA Property, of DataType Boolean, represents the BACnet property Out_Of_Service.

It is an indication of whether or not the physical input that the object represents is not in service. While Out_Of_Service is True, Present_Value and Reliability may be changed to any value as a means of simulation and/or testing.

This OPC UA Property, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four Boolean flags that represent the general health of a BACnetAnalogType. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

This OPC UA Property, of type Float, represents the BACnet property COV_Increment.

It shall specify the minimum change in the BACnet property Present_Value that will cause a Change of Value notification to be issued to BACnet clients that have subscribed to Change of Value events.

This OPC UA Property, of DataType Float, represents the BACnet property Resolution.

It indicates the smallest recognizable change in Present_Value in engineering units.

The EventReporting Object contains status and configuration information for the event reporting of BACnetAnalogTypes and their subtypes. The BACnetEventReportingType is defined in 8.8. The Object is optional and is not present if event generation is not activated for the BACnet object.

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetOutOfRangeAlgorithmType and ModellingRule Mandatory if used in the BACnetAnalogType or one of its subtypes. The BACnetOutOfRangeAlgorithmType is defined in 8.9.3.

On the EventAlgorithm instance of the BACnetOutOfRangeAlgorithmType the BACnet property High_Limit is mapped to pHighLimit, the BACnet property Low_Limit is mapped to LowLimit, the BACnet property Deadband is mapped to pDeadband and the BACnet property Limit_Enable is mapped to LimitEnable.

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetAnalogType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

This OPC UA ObjectType represents the BACnet object type Analog Input. An analog input converts a continuously variable input signal into a discrete value that can be processed by a computer system.

Figure 14 shows an overview for the BACnetAnalogInputType with its Properties and related ObjectTypes. It is formally defined in Table 14.

Figure 14 – BACnetAnalogInputType overview

The BACnetAnalogInputType ObjectType is formally defined in Table 14.

Table 14 – BACnetAnalogInputType Definition

Attribute		Value
BrowseName		BACnetAnalogInputType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetAnalogType
0:HasProperty	Variable		Device_Type	0:String	0:PropertyType	O

The BACnetAnalogInputType ObjectType is a concrete type and can be used directly.

This OPC UA Property, of DataType String, represents the BACnet property Device_Type.

It is a text description of the physical device connected to the analog input.

This OPC UA ObjectType represents the BACnet object type Analog Output. An analog output converts a discrete value into a continuously variable output signal.

Figure 15 shows an overview for the BACnetAnalogOutput with its Properties and related ObjectTypes. It is formally defined in Table 15.

Figure 15 – BACnetAnalogOutputType overview

The BACnetAnalogOutput ObjectType is formally defined in Table 15.

Table 15 – BACnetAnalogOutputType Definition

Attribute		Value
BrowseName		BACnetAnalogOutputType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetAnalogType
0:HasProperty	Variable		Device_Type	0:String	0:PropertyType	O
0:HasProperty	Variable		Priority_Array	BACnetPriorityValue [16]	0:PropertyType	M
0:HasProperty	Variable		Relinquish_Default	0:Float	0:PropertyType	M

The BACnetAnalogOutput ObjectType is a concrete type and can be used directly.

This OPC UA Property, of DataType String, represents the BACnet property Device_Type.

It is a text description of the physical device connected to the analog output.

This OPC UA Property, of DataType BACnetPriorityValue [16], represents the BACnet property Priority_Array. The BACnetPriorityValue DataType is defined in 10.6.4.

It is an array that contains prioritized values that are in effect for this object. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType Float, represents the BACnet property Relinquish_Default.

It is the default value to be used for the Present_Value when all command priority values in the Priority_Array have a NULL value. See 3.2.1 for details on command prioritization.

This OPC UA ObjectType represents the BACnet object type Analog Value. This is a control system parameter that resides in the memory of the BACnet Device.

Figure 16 shows an overview for the BACnetAnalogValueType with its Properties and related ObjectTypes. It is formally defined in Table 16.

Figure 16 – BACnetAnalogValueType overview

The BACnetAnalogValueType ObjectType is formally defined in Table 16.

Table 16 – BACnetAnalogValueType Definition

Attribute		Value
BrowseName		BACnetAnalogValueType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetAnalogType
0:HasProperty	Variable		Priority_Array	BACnetPriorityValue [16]	0:PropertyType	O
0:HasProperty	Variable		Relinquish_Default	0:Float	0:PropertyType	O

The BACnetAnalogValueType ObjectType is a concrete type and can be used directly.

This OPC UA Property, of DataType BACnetPriorityValue [16], represents the BACnet property Priority_Array. The BACnetPriorityValue DataType is defined in 10.6.4.

It is an array that contains prioritized commands that are in effect for this object. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType 0:Float, represents the BACnet property Relinquish_Default.

It is the default value to be used for the Present_Value when all command priority values in the Priority_Array have a NULL value. See 3.2.1 for details on command prioritization.

This OPC UA ObjectType defines the super type for all OPC UA ObjectTypes that represent BACnet Binary object types in an OPC UA Address Space.

Figure 17 shows an overview for the BACnetBinaryType with its Properties and related ObjectTypes. It is formally defined in Table 17.

Figure 17 – BACnetBinaryType overview

The BACnetBinaryType ObjectType is formally defined in Table 17.

Table 17 – BACnetBinaryType Definition

Attribute		Value
BrowseName		BACnetBinaryType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasComponent	Variable		Present_Value	0:Boolean	TwoStateDiscreteType	M
0:HasProperty	Variable		Out_Of_Service	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasComponent	Object		ChangeOfState		BACnetChangeOfStateCountType	O
0:HasComponent	Object		ElapsedActive Time		BACnetElapsedActiveTimeType	O
0:HasComponent	Object		EventReporting		BACnetEventReportingType	O
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluationType	O

The BACnetBinaryType ObjectType is an abstract type and cannot be used directly.

This OPC UA Variable, of DataType 0:Boolean, represents the logical state of the BACnet Binary Input object. The logical state of the Input shall be either Inactive or Active.

This OPC UA TwoStateDiscreteType Variable represents the BACnet properties Present_Value, Inactive_Text and Active_Text. The OPC UA VariableType TwoStateDiscreteType is defined in OPC 10000-8. It defines the OPC UA Properties TrueState and FalseState.

The following list provides the BACnet property and the mapping to the corresponding data member in the OPC UA TwoStateDiscrete item.

• Present_Value represented by Value Attribute of the Variable.
• Active_Text represented by the TrueState Property of the Variable.
• Inactive_Text represented by the FalseState Property of the Variable.

This OPC UA Property, of DataType 0:Boolean, represents the BACnet property Out_Of_Service.

It is an indication of whether or not the physical input that the object represents is not in service. While the Out_Of_Service property is True, the Present_Value and Reliability properties may be changed to any value as a means of simulation and/or testing.

This OPC UA Property, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four 0:Boolean flags that represent the general health of an analog input. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

The ChangeOfState Object contains BACnet properties related to counting the change of state of BACnetBinaryType Objects. The BACnetChangeOfStateCountType is defined in 8.1. The Object is optional and is not present if change of state counting is not activated for the BACnet object.

The ElapsedActiveTime Object contains BACnet properties related to the elapsed active time of BACnetBinaryType Objects. The BACnetElapsedActiveTimeType is defined in 8.7. The Object is optional and is not present if this feature is not available for the BACnet object.

The EventReporting Object contains status and configuration information for the event reporting of BACnetBinaryType Objects. The BACnetEventReportingType is defined in 8.8. The Object is optional and is not present if event generation is not activated for the BACnet object.

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetBinaryType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

This OPC UA ObjectType represents the BACnet object type Binary Input. A binary input converts one or more discrete input signals into a value that can be processed by a computer system.

Figure 18 shows an overview for the BACnetBinaryInputType with its Properties and related ObjectTypes. It is formally defined in Table 18.

Figure 18 – BACnetBinaryInputType overview

The BACnetBinaryInputType ObjectType is formally defined in Table 18.

Table 18 – BACnetBinaryInputType Definition

Attribute		Value
BrowseName		BACnetBinaryInputType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetBinaryType defined in 7.8.
0:HasComponent	Object		EventReporting		BACnetEventReportingType	O
0:HasProperty	Variable		Device_Type	0:String	0:PropertyType	O
0:HasProperty	Variable		Polarity	BACnetPolarity	0:PropertyType	M

The BACnetBinaryInputType ObjectType is a concrete type and can be used directly.

The components of the BACnetBinaryInputType have additional subcomponents which are defined in Table 19.

Table 19 – BACnetBinaryInputType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetChangeOfStateAlgorithmType	M
EventReporting EventAlgorithm	0:HasProperty	Variable	AlarmValues	0:Boolean	0:PropertyType	M

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetChangeOfStateAlgorithmType and ModellingRule Mandatory if used in the BACnetBinaryInputType. The BACnetChangeOfStateAlgorithmType is defined in 8.10.

On the EventAlgorithm instance of the BACnetChangeOfStateAlgorithmType, the DataType of the Alarm_Values Property is changed to 0:Boolean.

The BACnet property Alarm_Value of the BACnet object type Binary Input is mapped to the AlarmValues Property of the BACnetChangeOfStateAlgorithmType.

This OPC UA Property, of DataType String, represents the BACnet property Device_Type.

It is a text description of the physical device connected to the binary input.

This OPC UA Property, of DataType BACnetPolarity, represents the BACnet property Polarity. The BACnetPolarity DataType is defined in 10.4.22.

It indicates the relationship between the physical state of the Input and the logical state represented by the Present_Value property.

This OPC UA ObjectType represents the BACnet object type Binary Output. A binary output converts a value into one or more discrete output signals.

Figure 19 shows an overview for the BACnetBinaryOutputType with its Properties and related ObjectTypes. It is formally defined in Table 20.

Figure 19 – BACnetBinaryOutputType overview

The BACnetBinaryOutputType ObjectType is formally defined in Table 20.

Table 20 – BACnetBinaryOutputType Definition

Attribute		Value
BrowseName		BACnetBinaryOutputType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetBinaryType defined in 7.8.
0:HasComponent	Object		EventReporting		BACnetEvent ReportingType	O
0:HasProperty	Variable		Device_Type	0:String	0:PropertyType	O
0:HasProperty	Variable		Polarity	BACnetPolarity	0:PropertyType	M
0:HasProperty	Variable		Priority_Array	BACnetPriorityValue [16]	0:PropertyType	M
0:HasProperty	Variable		Relinquish_Default	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Minimum_Off_Time	0:UInt32	0:PropertyType	O
0:HasProperty	Variable		Minimum_On_Time	0:UInt32	0:PropertyType	O
0:HasProperty	Variable		Feedback_Value	0:Boolean	0:PropertyType	O

The BACnetBinaryOutputType ObjectType is a concrete type and can be used directly.

The components of the BACnetBinaryOutputType have additional subcomponents which are defined in Table 21.

Table 21 – BACnetBinaryOutputType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetCommandFailureAlgorithmType	M

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetCommandFailureAlgorithmType and ModellingRule Mandatory if used in the BACnetBinaryOutputType. The BACnetCommandFailureAlgorithmType is defined in 8.10.

This OPC UA Property, of DataType String, represents the BACnet property Device_Type.

It is a text description of the physical device connected to the binary output.

This OPC UA Property, of DataType BACnetPolarity, represents the BACnet property Polarity. The BACnetPolarity DataType is defined in 10.4.22.

It indicates the relationship between the physical state of the Ouput and the logical state represented by the Present_Value property.

This OPC UA Property, of DataType BACnetPriorityValue [16], represents the BACnet property Priority_Array. The BACnetPriorityValue DataType is defined in 10.6.4.

It is an array that contains prioritized commands that are in effect for this object. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType 0:Boolean, represents the BACnet property Relinquish_Default.

It is the default value to be used for the Present_Value when all command priority values in the Priority_Array have a NULL value. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType UInt32, represents the BACnet property Minimum_Off_Time.

It represents the minimum number of seconds that the Present_Value shall remain in the Inactive state after a write to the Present_Value property causes that property to assume the Inactive state.

This OPC UA Property, of DataType UInt32, represents the BACnet property Minimum_On_Time.

It represents the minimum number of seconds that the Present_Value shall remain in the Active state after a write to the Present_Value property causes the property to assume the Active state.

This OPC UA Property, of type 0:Boolean, is an indication of the actual value of the entity controlled by Present_Value.

This OPC UA ObjectType represents a BACnet Binary Value object type. A binary value is a control system parameter that resides in the memory of the BACnet Device and may be one of only two states.

Figure 20 shows an overview for the BACnetBinaryValueType with its Properties and related ObjectTypes. It is formally defined in Table 22.

Figure 20 – BACnetBinaryValueType overview

The BACnetBinaryValueType ObjectType is formally defined in Table 22.

Table 22 – BACnetBinaryValueType Definition

Attribute		Value
BrowseName		BACnetBinaryValueType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetBinaryType defined in 7.8.
0:HasComponent	Object		EventReporting		BACnetEvent ReportingType	O
0:HasProperty	Variable		Priority_Array	BACnetPriorityValue [16]	0:PropertyType	O
0:HasProperty	Variable		Relinquish_Default	0:Boolean	0:PropertyType	O
0:HasProperty	Variable		Minimum_Off_Time	0:UInt32	0:PropertyType	O
0:HasProperty	Variable		Minimum_On_Time	0:UInt32	0:PropertyType	O

The BACnetBinaryValueType ObjectType is a concrete type and can be used directly.

The components of the BACnetBinaryValueType have additional subcomponents which are defined in Table 23.

Table 23 – BACnetBinaryValueType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetChangeOfStateAlgorithmType	M
EventReporting EventAlgorithm	0:HasProperty	Variable	AlarmValues	0:Boolean	0:PropertyType	M

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetChangeOfStateAlgorithmType and ModellingRule Mandatory if used in the BACnetBinaryValueType. The BACnetChangeOfStateAlgorithmType is defined in 8.10.

On the EventAlgorithm instance of the BACnetChangeOfStateAlgorithmType, the DataType of the Alarm_Values Property is changed to 0:Boolean.

The BACnet property Alarm_Value of the BACnet object type Binary Value is mapped to the AlarmValues Property of the BACnetChangeOfStateAlgorithmType.

This OPC UA Property, of DataType BACnetPriorityValue [16], represents the BACnet property Priority_Array. The BACnetPriorityValue DataType is defined in 10.6.4.

It is an array that contains prioritized commands that are in effect for this object. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType 0:Boolean, represents the BACnet property Relinquish_Default.

It is the default value to be used for the Present_Value when all command priority values in the Priority_Array have a NULL value. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType UInt32, represents the BACnet property Minimum_Off_Time.

It represents the minimum number of seconds that the Present_Value shall remain in the Inactive state after a write to the Present_Value property causes that property to assume the Inactive state.

This OPC UA Property, of DataType UInt32, represents the BACnet property Minimum_On_Time.

It represents the minimum number of seconds that the Present_Value shall remain in the Active state after a write to the Present_Value property causes the property to assume the Active state.

This OPC UA ObjectType defines the super type for all OPC UA ObjectTypes that represent BACnet MultiState object types in an OPC UA Address Space.

Figure 21 shows an overview for the BACnetMultiStateType with its Properties and related ObjectTypes. It is formally defined in Table 24.

Figure 21 – BACnetMultiStateType overview

The BACnetMultiStateType ObjectType is formally defined in Table 24.

Table 24 – BACnetMultiStateType Definition

Attribute		Value
BrowseName		BACnetMultiStateType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasComponent	Variable		Present_Value	0:UInteger	MultiStateDiscreteType	M
0:HasProperty	Variable		Out_Of_Service	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasComponent	Object		EventReporting		BACnetEventReportingType	O
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluationType	O

The BACnetMultiStateType ObjectType is an abstract type and cannot be used directly.

This OPC UA Property, of DataType 0:UInteger, reflects the logical state of the input.

This OPC UA MultiStateDiscreteType Variable represents the BACnet properties Present_Value, State_Text and Number_Of_States. The OPC UA VariableType MultiStateDiscreteType is defined in OPC 10000-8. It defines the OPC UA Property EnumStrings.

The following list provides the BACnet property and the mapping to the corresponding data member in the OPC UA multistate discrete item.

• Present_Value represented by Value Attribute of the Variable.
• State_Text and Number_Of_States represented by the EnumStrings Property of the Variable. If the optional BACnet property State_Text is not present, the EnumStrings property is filled with State_1 to State_N strings where the N and the number of strings are defined by Number_Of_States.

This OPC UA Property, of DataType 0:Boolean, represents the BACnet property Out_Of_Service.

It is an indication of whether or not the physical input that the object represents is not in service. While the Out_Of_Service property is True, the Present_Value and Reliability properties may be changed to any value as a means of simulation and/or testing.

This OPC UA Property, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four 0:Boolean flags that represent the general health of a BACnetMultiStateType. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

The EventReporting Object contains status and configuration information for the event reporting of BACnetMultiStateType Objects. The BACnetEventReportingType is defined in 0. The Object is optional and is not present if event generation is not activated for the BACnet object.

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetMultiStateType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

This OPC UA ObjectType represents the BACnet object type MultiState Input. A multi-state input includes a Present_Value variable whose value represents a state set by a locally defined algorithm.

Figure 22 shows an overview for the BACnetMultiStateInputType with its Properties and related ObjectTypes. It is formally defined in Table 25.

Figure 22 – BACnetMultiStateInputType overview

The BACnetMultiStateInputType ObjectType is formally defined in Table 25.

Table 25 – BACnetMultiStateInputType Definition

Attribute		Value
BrowseName		BACnetMultiStateInputType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetMultiStateType defined in 7.12.
0:HasComponent	Object		EventReporting		BACnetEventReportingType	O
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluationType	O
0:HasProperty	Variable		Device_Type	0:String	0:PropertyType	O

The BACnetMultiStateInputType ObjectType is a concrete type and can be used directly.

The components of the BACnetMultiStateInputType have additional subcomponents which are defined in Table 26.

Table 26 – BACnetMultiStateInputType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetChangeOfStateAlgorithmType	M
EventReporting EventAlgorithm	0:HasProperty	Variable	AlarmValues	0:UInteger [ ]	0:PropertyType	M
FaultEvaluation	0:HasComponent	Object	FaultAlgorithm		BACnetFaultStateAlgorithmType	O
FaultEvaluation FaultAlgorithm	0:HasProperty	Variable	FaultValues	0:UInteger [ ]	0:PropertyType	M

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetChangeOfStateAlgorithmType and ModellingRule Mandatory if used in the BACnetMultiStateInputType. The BACnetChangeOfStateAlgorithmType is defined in 8.10.

On the EventAlgorithm instance of the BACnetChangeOfStateAlgorithmType, the DataType of the Alarm_Values Property is changed to 0:UInteger array.

The BACnet property Alarm_Values of the BACnet object type Multi State Input is mapped to the AlarmValues Property of the BACnetChangeOfStateAlgorithmType.

The instance declaration Object FaultEvaluation overrides definitions of the BACnetFaultEvaluationType.

The FaultAlgorithm component is changed to TypeDefinition BACnetFaultStateAlgorithmType if used in the BACnetMultiStateInputType. The BACnetFaultStateAlgorithmType is defined in 8.25.

On the FaultAlgorithm instance of the BACnetFaultStateAlgorithmType, DataType of the Fault_Values Property is changed to 0:UInteger array.

This OPC UA Property, of DataType String, represents the BACnet property Device_Type.

It provides a text description of the physical device connected to the multi-state input.

This OPC UA ObjectType represents the BACnet object type MultiState Output. A multi-state output includes a Present_Value variable whose value represents the desired state of a physical output. The states and algorithms used to generate them are locally defined.

Figure 23 shows an overview for the BACnetMultiStateOutputType with its Properties and related ObjectTypes. It is formally defined in Table 27.

Figure 23 – BACnetMultiStateOutputType overview

The BACnetMultiStateOutputType ObjectType is formally defined in Table 27.

Table 27 – BACnetMultiStateOutputType Definition

Attribute		Value
BrowseName		BACnetMultiStateOutputType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetMultiStateType defined in 7.12.
0:HasComponent	Object		EventReporting		BACnetEvent ReportingType	O
0:HasProperty	Variable		Device_Type	String	0:PropertyType	O
0:HasProperty	Variable		Priority_Array	BACnetPriorityValue [16]	0:PropertyType	M
0:HasProperty	Variable		Relinquish_Default	0:UInteger	0:PropertyType	M
0:HasProperty	Variable		Feedback_Value	0:UInteger	0:PropertyType	O

The BACnetMultiStateOutputType ObjectType is a concrete type and can be used directly.

The components of the BACnetMultiStateOutputType have additional subcomponents which are defined in Table 28.

Table 28 – BACnetMultiStateOutputType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetCommandFailureAlgorithmType	M

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetCommandFailureAlgorithmType and ModellingRule Mandatory if used in the BACnetMultiStateOutputType. The BACnetCommandFailureAlgorithmType is defined in 8.10.

This OPC UA Property, of DataType String, represents the BACnet property Device_Type.

It is a text description of the physical device connected to the multi-state output.

This OPC UA Property, of DataType BACnetPriorityValue [16], represents the BACnet property Priority_Array. The BACnetPriorityValue DataType is defined in 10.6.4.

It is an array that contains prioritized commands that are in effect for this object. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType 0:UInteger, represents the BACnet property Relinquish_Default.

It is the default value to be used for the Present_Value when all command priority values in the Priority_Array have a NULL value. See 3.2.1 for details on command prioritization.

This OPC UA Property, of type 0:UInteger, is an indication of the actual value of the entity controlled by Present_Value.

This OPC UA ObjectType represents a BACnet Multi-state Value object type. A multi-state value is a control system parameter that resides in the memory of the BACnet Device and includes a Present_Value variable whose value represents the object state. The states and algorithms used to generate them are locally defined.

Figure 24 shows an overview for the BACnetMultiStateValueType with its Properties and related ObjectTypes. It is formally defined in Table 29.

Figure 24 – BACnetMultiStateValueType overview

The BACnetMultiStateValueType ObjectType is formally defined in Table 29.

Table 29 – BACnetMultiStateValueType Definition

Attribute		Value
BrowseName		BACnetMultiStateValueType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetMultiStateType defined in 7.12.
0:HasComponent	Object		EventReporting		BACnetEvent ReportingType	O
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluationType	O
0:HasProperty	Variable		Priority_Array	BACnetPriorityValue [16]	0:PropertyType	O
0:HasProperty	Variable		Relinquish_Default	0:UInteger	0:PropertyType	O

The BACnetMultiStateValueType ObjectType is a concrete type and can be used directly.

The components of the BACnetMultiStateValueType have additional subcomponents which are defined in Table 30.

Table 30 – BACnetMultiStateValueType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetChangeOfStateAlgorithmType	M
EventReporting EventAlgorithm	0:HasProperty	Variable	AlarmValues	0:UInteger [ ]	0:PropertyType	M
FaultEvaluation	0:HasComponent	Object	FaultAlgorithm		BACnetFaultStateAlgorithmType	O
FaultEvaluation FaultAlgorithm	0:HasProperty	Variable	FaultValues	0:UInteger [ ]	0:PropertyType	M

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetChangeOfStateAlgorithmType and ModellingRule Mandatory if used in the BACnetMultiStateValueType. The BACnetChangeOfStateAlgorithmType is defined in 8.10.

On the EventAlgorithm instance of the BACnetChangeOfStateAlgorithmType, the DataType of the Alarm_Values Property is changed to 0:UInteger array.

The BACnet property Alarm_Values of the BACnet object type Multi State Value is mapped to the AlarmValues Property of the BACnetChangeOfStateAlgorithmType.

The instance declaration Object FaultEvaluation overrides definitions of the BACnetFaultEvaluationType.

The FaultAlgorithm component is changed to TypeDefinition BACnetFaultStateAlgorithmType if used in the BACnetMultiStateValueType. The BACnetFaultStateAlgorithmType is defined in 8.25.

On the FaultAlgorithm instance of the BACnetFaultStateAlgorithmType, DataType of the Fault_Values Property is changed to 0:UInteger array.

This OPC UA Property, of DataType BACnetPriorityValue [16], represents the BACnet property Priority_Array. The BACnetPriorityValue DataType is defined in 10.6.4.

It is an array that contains prioritized commands that are in effect for this object. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType UInteger, represents the BACnet property Relinquish_Default.

It is the default value to be used for the Present_Value when all command priority values in the Priority_Array have a NULL value. See 3.2.1 for details on command prioritization.

This OPC UA Property, of DataType UInteger [], represents the BACnet property Fault_Values.

The Fault_Values provide the values used by the fault state algorithm to determine whether the monitored value is in a fault state.

This OPC UA ObjectType represents a BACnet Calendar object type. A calendar is used to describe a list of calendar dates. Each entry in the list describes a specific date or date pattern, range of dates, or month/week-of-month/day-of-week specification.

Figure 25 shows an overview for the BACnetCalendarType with its Properties and related ObjectTypes. It is formally defined in Table 31.

Figure 25 – BACnetCalendarType overview

The BACnetCalendarType ObjectType is formally defined in Table 31.

Table 31 – BACnetCalendarType Definition

Attribute		Value
BrowseName		BACnetCalendarType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasComponent	Variable		Present_Value	0:Boolean	0:BaseDataVariableType	M
0:HasProperty	Variable		Date_List	BACnetCalendarEntry [ ]	0:PropertyType	M
0:HasComponent	Method		AddDateListElements			M
0:HasComponent	Method		RemoveDateListElements			M

The BACnetCalendarType ObjectType is a concrete type and can be used directly.

This OPC UA Variable, of DataType Boolean, represents the BACnet property Present_Value.

It indicates the current value of the calendar: True if the current date is in the Date_List and False if it is not.

This OPC UA Property, of DataType BACnetCalendarEntry [], represents the BACnet property Date_List. The BACnetCalendarEntry DataType is defined in 10.6.2.

It is an array of elements of which each is either a specific date or date pattern (BACnetDate see 10.5.6), range of dates (BACnetDateRange see 10.5.7), or month/week-of-month/day-of-week specification (BACnetWeekNDay see 10.5.35).

This Method adds entries to the BACnet property Date_List.

Signature

AddDateListElements (

[in]BACnetCalendarEntry[] CalendarEntries

[out]0:UInt32 FirstFailedElementNumber

);

Argument	Description
CalendarEntries	Array of calendar entries to add to the entries in the BACnet property Date_List. The BACnetCalenderEntry DataType is defined in 10.6.2.
FirstFailedElementNumber	The numerical position, starting at 1, of the failed element in the CalendarEntries. If the call succeeds or fails for other reasons, the returned value shall be 0.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE and DATATYPE_NOT_SUPPORTED
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadOutOfMemory	This status is returned for the BACnet error code NO_SPACE_TO_ADD_LIST_ELEMENT

This Method removes entries from the BACnet property Date_List.

Signature

RemoveDateListElements (

[in]BACnetCalendarEntry [] CalendarEntries

[out]0:UInt32 FirstFailedElementNumber

);

Argument	Description
CalendarEntries	Array of calendar entries to remove from the entries in the BACnet property Date_List. The BACnetCalenderEntry DataType is defined in 10.6.2.
FirstFailedElementNumber	The numerical position, starting at 1, of the failed element in the CalendarEntries. If the call succeeds or fails for other reasons, the returned value shall be 0.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadNotFound	This status is returned for the BACnet error code LIST_ELEMENT_NOT_FOUND

This OPC UA ObjectType represents a BACnet Schedule object type. This type defines a periodic schedule that can recur over a range of dates. The schedule may have optional exceptions at arbitrary times or dates. The basic unit of a schedule is days, which are divided into two types: normal days within a week and exception days. A priority mechanism defines which scheduled event is currently valid. The schedule includes a Present_Value variable whose value describes the current state of the schedule, including a default value when no schedules are in effect.

Figure 26 shows an overview for the BACnetScheduleType with its Properties and related ObjectTypes. It is formally defined in Table 32.

Figure 26 – BACnetScheduleType overview

The BACnetScheduleType ObjectType is formally defined in Table 32.

Table 32 – BACnetScheduleType Definition

Attribute		Value
BrowseName		BACnetScheduleType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasComponent	Variable		Present_Value	0:BaseDataType	0:BaseDataVariableType	M
0:HasComponent	Variable		Schedule_Default	0:BaseDataType	0:BaseDataVariableType	M
0:HasProperty	Variable		Exception_Schedule	BACnetSpecialEvent []	0:PropertyType	O
0:HasProperty	Variable		Weekly_Schedule	BACnetDailySchedule[7]	0:PropertyType	O
0:HasProperty	Variable		List_Of_Object_Property_References	BACnetDeviceObject PropertyReference[]	0:PropertyType	M
0:HasComponent	Method		AddObjectProperty References			M
0:HasComponent	Method		RemoveObject PropertyReferences			M
0:HasProperty	Variable		Priority_For_Writing	0:Byte	0:PropertyType	M
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluation Type	O
0:HasProperty	Variable		Out_Of_Service	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasProperty	Variable		Effective_Period	BACnetDateRange	0:PropertyType	M
0:HasComponent	Object		EventReporting		BACnetEvent ReportingType	O

The BACnetScheduleType ObjectType is a concrete type and can be used directly.

This OPC UA Variable, of DataType BaseDataType, represents the BACnet property Present_Value.

It indicates the current value of the schedule. Most analog, binary, and enumerated values may be scheduled using this abstract DataType.

This OPC UA Variable, of DataType BaseDataType, represents the BACnet property Schedule_Default.

It represents a default value to be used for the Present_Value property when no other scheduled value is in effect.

This OPC UA Property, of DataType BACnetSpecialEvent [], represents the BACnet property Exception_Schedule. The BACnetSpecialEvent DataType is defined in 10.5.31.

Each BACnetSpecialEvent describes a sequence of schedule actions that take precedence over a normal day’s behaviour on a special day or days.

At least one of the two BACnet properties Exception_Schedule and Weekly_Schedule must be present.

This OPC UA Property, of DataType BACnetDailySchedule [7], represents the BACnet property Weekly_Schedule. The BACnetDailySchedule DataType is defined in 10.5.5.

The Weekly_Schedule property contains exactly 7 elements, one for each day of the week. Each element describes a sequence of time/value pairs that provides a sequence of schedule actions on one day of the week when no Exception_Schedule is in effect.

At least one of the two BACnet properties Exception_Schedule and Weekly_Schedule must be present.

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference, represents the BACnet property List_Of_Object_Property_References.

The BACnetDeviceObjectPropertyReference DataType is defined in 10.5.9.

It specifies the Device_Identifiers, Object_Identifiers, and Property_Identifiers of the properties to be written with specific values at specific times on specific days.

This Method adds entries to the BACnet property List_Of_Object_Property_References.

Signature

AddObjectPropertyReferences (

[in]BACnetDeviceObjectPropertyReference []

DeviceObjectPropertyReferences

[out]0:UInt32FirstFailedElementNumber

);

Argument	Description
DeviceObjectProperty References	Array of device object references to add to the entries in the BACnet property List_Of_Object_Property_References. The BACnetDeviceObjectPropertyReference DataType is defined in 10.5.9.
FirstFailedElementNumber	The numerical position, starting at 1, of the failed element in the CalendarEntries. If the call succeeds or fails for other reasons, the returned value shall be 0.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE and DATATYPE_NOT_SUPPORTED
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadOutOfMemory	This status is returned for the BACnet error code NO_SPACE_TO_ADD_LIST_ELEMENT

This Method removes entries from the BACnet property List_Of_Object_Property_References.

Signature

RemoveObjectPropertyReferences (

[in]BACnetDeviceObjectPropertyReference []

DeviceObjectPropertyReferences

[out]0:UInt32FirstFailedElementNumber

);

Argument	Description
DeviceObjectProperty References	Array of device object references to add to the entries in the BACnet property List_Of_Object_Property_References. The BACnetDeviceObjectPropertyReference DataType is defined in 10.5.9.
FirstFailedElementNumber	The numerical position, starting at 1, of the failed element in the CalendarEntries. If the call succeeds or fails for other reasons, the returned value shall be 0.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED
BadNotFound	This status is returned for the BACnet error code LIST_ELEMENT_NOT_FOUND

This OPC UA Property, of DataType Byte, represents the BACnet property Priority_For_Writing.

It defines the priority at which the referenced properties are commanded. Valid values are in the range 1-16, with 1 being considered the highest priority and 16 the lowest. See 3.2.1 for details on command prioritization.

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetScheduleType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

This OPC UA Property, of DataType Boolean, represents the BACnet property Out_Of_Service.

It is an indication of whether or not the internal calculations of the schedule object are used to determine the value of the Present_Value property. Other functions that depend on the state of the Present_Value shall respond to changes made to that property while Out_Of_Service is True, as if those changes had occurred by internal calculations.

This OPC UA Property, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four boolean flags that represent the general health of an analog input. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

This OPC UA Property, of DataType BACnetDateRange, represents the BACnet property Status_Flags. The BACnetDateRange DataType is defined in 10.5.7.

It specifies the range of dates within which the Schedule object is active. Upon entering its effective period, the object shall calculate its Present_Value.

BACnet schedule objects may optionally support event reporting to facilitate the reporting of fault conditions. The BACnetEventReportingType is defined in 8.8.

This OPC UA ObjectType represents a BACnet Loop object type. This type defines the externally visible characteristics of a feedback control loop.

Figure 27 shows an overview for the BACnetLoopType with its Properties and related ObjectTypes. It is formally defined in Table 33.

Figure 27 – BACnetLoopType overview (example PID loop)

The BACnetLoopType ObjectType is formally defined in Table 33.

Table 33 – BACnetLoopType Definition

Attribute		Value
BrowseName		BACnetLoopType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasComponent	Variable		Present_Value	0:Float	0:AnalogUnitType	M
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluation Type	O
0:HasProperty	Variable		Out_Of_Service	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Manipulated_Variable_Reference	BACnetDeviceObject PropertyReference	0:PropertyType	M
0:HasProperty	Variable		Controlled_Variable_Reference	BACnetDeviceObject PropertyReference	0:PropertyType	M
0:HasComponent	Variable		Controlled_Variable_Value	0:Float	0:AnalogUnitType	M
0:HasProperty	Variable		Setpoint_Reference	BACnetDeviceObject PropertyReference	0:PropertyType	M
0:HasComponent	Variable		Setpoint	0:Float	0:AnalogUnitType	M
0:HasProperty	Variable		Action	BACnetAction	0:PropertyType	M
0:HasComponent	Variable		Proportional_Constant	0:Float	0:AnalogUnitType	O
0:HasComponent	Variable		Integral_Constant	0:Float	0:AnalogUnitType	O
0:HasComponent	Variable		Derivative_Constant	0:Float	0:AnalogUnitType	O
0:HasComponent	Variable		Bias	0:Float	0:AnalogUnitType	O
0:HasProperty	Variable		Priority_For_Writing	0:Byte	0:PropertyType	O
0:HasProperty	Variable		COV_Increment	0:Float	0:PropertyType	O
0:HasComponent	Object		EventReporting		BACnetEventReportingType	O

The BACnetLoopType ObjectType is a concrete type and can be used directly.

The components of the BACnetLoopType have additional subcomponents which are defined in Table 34.

Table 34 – BACnetLoopType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetFloatingLimitAlgorithmType	M

This OPC UA Variable, of DataType Float, represents the BACnet property Present_Value. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Output_Units.

The Present_Value of the BACnetLoopType indicates the current output value of the loop algorithm and describes the engineering units of the value. If the object supports event reporting, then the Present_Value is the monitored value for the object’s event algorithm. See the BACnet specification for information on the BACnet event enrolment model.

This OPC UA AnalogItemType Variable represents the BACnet properties Present_Value, Minimum_Output, Maximum_Output, Output_Units and Update_Interval. The OPC UA VariableType AnalogItemType is defined in OPC 10000-8. It defines the OPC UA Properties EURange, EngineeringUnits and InstrumentRange.

The following list provides the BACnet property and the mapping to the corresponding data member in the OPC UA AnalogItem.

• Present_Value represented by Value Attribute of the Variable.
• Minimum_Output represented by Low part of EURange Property of the Variable. If the optional BACnet property Minimum_Output is not present, the EURange Property should not be provided.
• Maximum_Output represented by the High part of EURange Property of the Variable. If the optional BACnet property Maximum_Output is not present, the EURange Property should not be provided.
• Output_Units represented by the EngineeringUnits Property of the Variable. The mapping of BACnet units to OPC UA units is defined in 11.
• Update_Interval represented by MinSamplingInterval Attribute of the Variable.

This OPC UA Property, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four Boolean flags that represent the general health of a BACnetLoopType. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetLoopType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

This OPC UA Property, of DataType Boolean, represents the BACnet property Out_Of_Service.

It is an indication of whether or not the physical input that the object represents is not in service. While Out_Of_Service is True, Present_Value and Reliability may be changed to any value as a means of simulation and/or testing.

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference, represents the BACnet property Manipulated_Variable_Reference. The BACnetDeviceObjectProperty Reference DataType is defined in 10.5.9.

This property indicates an object and property that the output (Present_Value) of the control loop is written to. Generally this is a BACnet Analog Output object used to position a device, but it could also be another object or property. See the BACnet specification for additional examples.

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference, represents the BACnet property Controlled_Variable_Reference. The BACnetDeviceObjectProperty Reference DataType is defined in 10.5.9.

This property identifies the property used to set the Controlled_Variable_Value property of the Loop object. Normally this is the Present_Value of an Analog Input object that is used to measure a process variable (for example, temperature) but it could also be another object. See the BACnet specification for additional examples.

This OPC UA Variable, of DataType Float, represents the BACnet property Controlled_Variable_Value. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Controlled_Variable_Units.

This property indicates the value of the property (and its engineering units) of the object that is referenced by the Controlled_Variable_Reference property. The control loop compares this value with the Setpoint to calculate the error.

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference, represents the BACnet property Setpoint_Reference. The BACnetDeviceObjectProperty Reference DataType is defined in 10.5.9. The value 4194303 is used as objectIdentifier to indicate that the property is not initialized.

This property represents either zero or one reference. If the reference is zero, then the setpoint for this control loop is fixed and is contained in the Setpoint property. The presence of a reference indicates that the property of another object contains the setpoint value used for the Loop object and the reference specifies that property.

This OPC UA Variable, of DataType Float, represents the BACnet property Setpoint. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Output_Units.

The Setpoint of the BACnetLoopType is the value of the loop setpoint or the property of the object referenced by the Setpoint_Reference (in engineering units described by the Controlled_Variable_Value property).

This OPC UA Property, of DataType BACnetAction, represents the BACnet property Action. The DataType BACnetAction is defined in 10.4.2.

This property indicates whether the loop is “direct” or “reverse”.

This OPC UA Variable, of DataType Float, represents the BACnet property Proportional_Constant. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Proportional_Constant_Units.

This property indicates the value and engineering unit of the proportional gain parameter that is used by the loop algorithm. It is used to represent the various forms of gain for the proportional control mode (overall gain, throttling range, or proportional band).

This OPC UA Variable, of DataType 0:Float, represents the BACnet property Integral_Constant. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Integral_Constant_Units.

This property indicates the value and engineering units of the integral gain parameter that is used by the loop algorithm. It may be used to represent any of the various forms of gain for the integral control mode (reset time or rate).

This OPC UA Variable, of DataType 0:Float, represents the BACnet property Derivative_Constant. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Derivative_Constant_Units.

This property indicates the value and engineering units of the derivative gain parameter used by the loop algorithm. It may be used to represent any of the various forms of gain for the derivative control mode (derivative time or rate time).

This OPC UA Variable, of DataType 0:Float, represents the BACnet property Bias. The OPC UA EngineeringUnits Property of the Variable represents the BACnet property Output_Units.

This property indicates the bias value that is used by the loop algorithm.

This OPC UA Variable, of DataType Byte, represents the BACnet property Priority_For_Writing.

This property provides a priority to be used by the command prioritization mechanism. This allows loop objects to be used to control the commandable property of an object. In particular, it identifies the particular priority slot in the Priority_Array of the Manipulated_Variable_Reference that is controlled by this loop. See the BACnet specification for the specific range of allowed values.

This OPC UA Variable, of DataType 0:Float, represents the BACnet property COV_Increment.

This property specifies the minimum change in Present_Value that will cause a COV Notification to be issued to COV clients. This property is required if COV reporting is supported by this object.

The EventReporting Object contains status and configuration information for the event reporting of BACnetLoopType. The BACnetEventReportingType is defined in 8.8. The Object is optional and is not present if event generation is not activated for the BACnet object.

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetFloatingLimitAlgorithmType and ModellingRule Mandatory if used in the BACnetLoopType. The BACnetFloatingLimitAlgorithmType is defined in 8.12.

On the EventAlgorithm instance of the BACnetFloatingLimitAlgorithmType the BACnet property Error_Limit is mapped to both LowDiffLimit and HighDiffLimit. The BACnet property Deadband is mapped to pDeadband. The parameter SetpointReference contains the reference to the BACnet property Setpoint of this object.

This OPC UA ObjectType represents a status, error, and event reporting configuration for a BACnet device.

Figure 28 shows an overview for the BACnetEventEnrollmentType with its Properties and related ObjectTypes. It is formally defined in Table 35.

Figure 28 – BACnetEventEnrollmentType overview

The BACnetEventEnrollmentType ObjectType is formally defined in Table 35.

Table 35 – BACnetEventEnrollmentType Definition

Attribute		Value
BrowseName		BACnetEventEnrollmentType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasProperty	Variable		Event_State	BACnetEventState	0:PropertyType	M
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasProperty	Variable		Event_Type	BACnetEventType	0:PropertyType	M
0:HasComponent	Method		SetEventAlgorithm			M
0:HasProperty	Variable		Object_Property_Reference	BACnetDeviceObjectPropertyReference	0:PropertyType	M
0:HasProperty	Variable		Fault_Type	BACnetFaultType	0:PropertyType	M
0:HasComponent	Method		SetFaultAlgorithm			O
0:HasComponent	Object		FaultEvaluation		BACnetFaultEvaluation Type	M
0:HasComponent	Object		EventReporting		BACnetEventReportingType	M

The BACnetEventEnrollmentType ObjectType is a concrete type and can be used directly.

This OPC UA Variable, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four 0:Boolean flags that represent the general health of an analog input. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

This OPC UA Property, of DataType BACnetEventType, represents the BACnet property Event_Type. The BACnetEventType DataType is defined in 10.4.12.

The value of this Variable is an enumeration that indicates the type of event algorithm that is to be used to detect the occurance of events and the event value notification parameters that are conveyed in event notifications.

This Method sets the event algorithm for the EventReporting Object.

Signature

SetEventAlgorithm (

[in]BACnetEventParameter EventParameters

);

Argument	Description
EventParameters	The new event algorithm. The BACnetEventParameter DataType is defined in 10.6.4.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE and DATATYPE_NOT_SUPPORTED
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference, represents the BACnet property Object_Property_Reference. The BACnetDeviceObjectProperty Reference DataType is defined in 10.5.9.

It indicates the object and property that is referenced by the event enrollement object. The event algorithm specified by the Event_Type property is applied to the referenced property in order to determine the Event_State of the event.

This OPC UA Property, of DataType BACnetFaultType, represents the BACnet property Fault_Type. The BACnetFaultType DataType is defined in 10.4.13.

It is an enumeration (NONE, FAULT_CHARACTERSTRING, FAULT_EXTENDED, and so on) that indicates the type of fault algorithm that is applied by the event enrollment object.

This Method sets the fault algorithm for the FaultEvaluation Object.

Signature

SetFaultAlgorithm (

[in]BACnetFaultParameter FaultParameters

);

Argument	Description
FaultParameters	The new event algorithm. The BACnetFaultParameter DataType is defined in 10.6.4.

Method Result Codes

ResultCode	Description
BadNodeIdUnknown	This status is returned for the BACnet error codes UNKNOWN_OBJECT and UNKNOWN_PROPERTY
BadTypeMismatch	This status is returned for the BACnet error codes INVALID_DATATYPE and DATATYPE_NOT_SUPPORTED
BadOutOfRange	This status is returned for the BACnet error code VALUE_OUT_OF_RANGE
BadNotWritable	This status is returned for the BACnet error code WRITE_ACCESS_DENIED

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetEventEnrollmentType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

The EventReporting Object contains status and configuration information for the event reporting of BACnetEventEnrollmentType Objects. The BACnetEventReportingType is defined in 0. The Object is optional and is not present if event generation is not activated for the BACnet object.

This OPC UA ObjectType represents an object which monitors a property of a referenced object and serializes the timestamp as local time and value of the property into an internal buffer when a pre-defined condition is met. The serialization may be invoked on a periodic basis, using a trigger or upon a change of value.

Figure 29 shows an overview for the BACnetLogType with its Properties and related ObjectTypes. It is formally defined in Table 36.

Figure 29 – BACnetLogType overview

The BACnetLogType ObjectType is formally defined in Table 36.

Table 36 – BACnetLogType Definition

Attribute		Value
BrowseName		BACnetLogType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasProperty	Variable		Status_Flags	BACnetStatusFlags	0:PropertyType	M
0:HasProperty	Variable		Enable	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Start_Time	BACnetDateTime	0:PropertyType	O
0:HasProperty	Variable		Stop_Time	BACnetDateTime	0:PropertyType	O
0:HasProperty	Variable		Stop_When_Full	0:Boolean	0:PropertyType	M
0:HasProperty	Variable		Buffer_Size	0:UInt32	0:PropertyType	M
0:HasProperty	Variable		Record_Count	0:UInt32	0:PropertyType	M
0:HasProperty	Variable		Total_Record_Count	0:UInt32	0:PropertyType	M
0:HasProperty	Variable		Records_Since_Notification	0:UInt32	0:PropertyType	O
0:HasComponent	Object		FaultEvaluation		BACnetFault Evaluation Type	M
0:HasComponent	Object		EventReporting		BACnetEvent ReportingType	M

The BACnetLogType ObjectType is an abstract type and cannot be used directly.

The components of the BACnetLogType have additional subcomponents which are defined in Table 37.

Table 37 – BACnetLogType Additional Subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
EventReporting	0:HasComponent	Object	EventAlgorithm		BACnetBufferReadyAlgorithmType	M

This OPC UA Variable, of DataType BACnetStatusFlags, represents the BACnet property Status_Flags. The BACnetStatusFlags DataType is defined in 10.3.7.

It represents four 0:Boolean flags that represent the general health of an analog input. The flags are IN_ALARM, FAULT, OVERRIDDEN, and OUT_OF_SERVICE.

This OPC UA Property, of DataType Boolean, represents the BACnet property Enable.

When the Enable value is true, logging is enabled. When the Enable variable value is false, logging is not enabled. Logging occurs if and only if the Enable variable value is true and the device Local_Time.

This OPC UA Property, of DataType BACnetDateTime, represents the BACnet property Start_Time. The BACnetDateTime DataType is defined in 10.5.8.

The Start_Time value indicates the date and time at or after which logging shall be enabled by this variable. The variable is O, and if unspecified is ignored for the purpose of determining whether or not logging is enabled. If Start_Time specifies a time and date that is equal to or later than the Stop_Time then logging shall be disabled.

This OPC UA Property, of DataType BACnetDateTime, represents the BACnet property Stop_Time. The BACnetDateTime DataType is defined in 10.5.8.

The Stop_Time value indicates the date and time at or after which logging shall be disabled by this variable. The variable is O, and if unspecified is ignored for the purpose of determining whether or not logging is disabled. If Stop_Time indicates a date and time that is earlier than the Start_Time, then logging is disabled.

This OPC UA Property, of DataType Boolean, represents the BACnet property Stop_When_Full.

When the Stop_When_Full value is true, logging shall cease when the serialization buffer is full. When logging ceases because the next event would fill the buffer, an event indicating that the buffer is full is logged and the Enable variable shall be set false.

This OPC UA Property, of DataType UInt32, represents the BACnet property Buffer_Size.

The Buffer_Size value indicates the number of records that may be contained by the buffer.

This OPC UA Property, of DataType UInt32, represents the BACnet property Record_Count.

The Record_Count value indicates the number of records that are currently present in the buffer. When a value of zero is written to this variable, all records in the buffer shall be deleted and the Records_Since_Notification variable value shall be reset to zero.

This OPC UA Property, of DataType UInt32, represents the BACnet property Total_Record_Count.

The Total_Record_Count value indicates the total number of records that have been logged since the object was created. When the count is incremented past the maximum 32-bit integer value, the next value of the variable shall be 1.

This OPC UA Property, of DataType UInt32, represents the BACnet property Records_Since_Notification.

The Records_Since_Notification indicates the number of records that have been logged since the buffer was last cleared (notification), or since the beginning of the logging process if no notification has been delivered.

The FaultEvaluation Object contains status and configuration information for the fault evaluation of the BACnetLoopType. The BACnetFaultEvaluationType is defined in 8.23. The Object is optional and is not present if fault evaluation is not activated for the BACnet object.

The EventReporting Object contains status and configuration information for the event reporting of BACnetTrendLogType. The BACnetEventReportingType is defined in 8.8. The Object is optional and is not present if event generation is not activated for the BACnet object.

The instance declaration Object EventReporting overrides definitions of the BACnetEventReportingType.

The EventAlgorithm component is changed to TypeDefinition BACnetFloatingLimitAlgorithmType and ModellingRule Mandatory if used in the BACnetLoopType. The BACnetBufferReadyAlgorithmType is defined in 8.14.

The Properties TimeDelay and TimeDelayNormal are set to 0 and shall be read only since they do not exist on a BACnet Trend Log object.

On the EventAlgorithm instance of the BACnetBufferReadyAlgorithmType the BACnet property Notification_Threshold is mapped to Threshold. The BACnet property Last_Notify_Record is mapped to PreviousCount.

This OPC UA ObjectType represents the intrinsic configuration paremeters of a trend log. This primarily represents the basis upon which logging is performed: periodic, “triggered”, or based upon a change of value.

Figure 30 shows an overview for the BACnetTrendLogBaseType with its Properties and related ObjectTypes. It is formally defined in Table 38.

Figure 30 – BACnetTrendLogBaseType overview

The BACnetTrendLogBaseType ObjectType is formally defined in Table 38.

Table 38 – BACnetTrendLogBaseType Definition

Attribute		Value
BrowseName		BACnetTrendLogBaseType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetLogType defined in 7.20.
0:HasProperty	Variable		Logging_Type	BACnetLoggingType	0:PropertyType	O
0:HasProperty	Variable		Log_Interval	0:UInteger	0:PropertyType	O
0:HasProperty	Variable		Align_Intervals	0:Boolean	0:PropertyType	O
0:HasProperty	Variable		Interval_Offset	0:UInteger	0:PropertyType	O
0:HasProperty	Variable		Trigger	0:Boolean	0:PropertyType	O

The BACnetTrendLogBaseType ObjectType is an abstract type and cannot be used directly.

This OPC UA Property, of DataType BACnetLoggingType, represents the BACnet property Logging_Type. The BACnetLoggingType DataType is defined in 10.4.16.

The Logging_Type value specifies whether the trend log collects record periodically, by change of value, or via “triggered” acquisition.

This OPC UA Property, of DataType UInteger, represents the BACnet property Log_Interval.

The Log_Interval value specifies a periodic value, in hundredths of a second, that the referenced property is logged when the Logging_Type variable value is POLLED. The variable value shall be zero and ignored when the Logging_Type variable value is anything other than POLLED.

This OPC UA Property, of DataType Boolean, represents the BACnet property Align_Intervals.

The Align_Intervals indicates whether clock-aligned periodic logging shall be enabled. When clock-aligned periodic logging is enabled, and the Log_Interval is a factor of a second, minute, hour, or day, then the beginning of the priod shall coincide with the next clock second, minute, hour, or day.

This OPC UA Property, of DataType UInteger, represents the BACnet property Interval_Offset.

The Interval_Offset value indicates an offset in hundredths of seconds from the beginning of the specified logging period until logging shall actually begin. The offset shall be interpreted as the Interval_Offset modulo the Log_Interval. For example, if the Log_Interval is 30 and the Interval_Offset is 31, then the offset shall be 1.

This OPC UA Property, of DataType Boolean, represents the BACnet property Trigger.

When the Trigger variable value transitions from true to false and the Logging_Type is TRIGGERED then the trend log shall serialize the referenced property. The Trigger variable value is reset to false when data acquisition is completed.

This OPC UA ObjectType represents an object that monitors a single property of a referenced object and logs its value and timestamp into an internal buffer when a set of pre-defined conditions are met.

Figure 31 shows an overview for the BACnetTrendLogType with its Properties and related ObjectTypes. It is formally defined in Table 39.

Figure 31 – BACnetTrendLogType overview

The BACnetTrendLogType ObjectType is formally defined in Table 39.

Table 39 – BACnetTrendLogType Definition

Attribute		Value
BrowseName		BACnetTrendLogType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetTrendLogBaseType defined in 7.20.3.10.
0:HasProperty	Variable		COV_Resubscription_Interval	0:UInteger	0:PropertyType	O
0:HasProperty	Variable		Client_COV_Increment	BACnetClientCOV	0:PropertyType	O
0:HasProperty	Variable		Log_DeviceObjectProperty	BACnetDeviceObject PropertyReference	0:PropertyType	O
0:HasComponent	Variable		Log_Buffer	BaseDataType	0:BaseData VariableType	M

The BACnetTrendLogType ObjectType is a concrete type and can be used directly.

This OPC UA Property, of DataType UInteger, represents the BACnet property COV_Resubscription_Interval.

The COV_Resubscription_Interval specifies the time in seconds between COV resubscriptions. The first COV subscription is issued when the trend log begins operations or when the Enable variable value becomes true.

This OPC UA Property, of DataType BACnetClientCOV, represents the BACnet property Client_COV_Increment. The BACnetClientCOV DataType is defined in 10.6.3.

The Client_COV_Increment value indicates the increment that is used to determine whether a change of value has occurred.

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference [], represents the BACnet property Log_DeviceObjectProperty. The BACnetDeviceObjectPropertyReference DataType is defined in 10.5.9.

The Log_DeviceObjectProperty variable specifies the Device Identifier, Object Identifier, and Property Identifier of the property to be trend logged.

This OPC UA Variable represents the BACnet property Log_Buffer. It represents a list of logged values and can only be accessed with with the BACnet service ReadRange. Therefore, the OPC UA representation requires the AccessLevel HistoryReadable to allow access of the logged values through OPC UA Service HistoryRead (see Table 40).

The current value is not readable since it is not provided through BACnet directly. The BACnetUaMapper may provide the current value by reading the referenced BACnet property that is logged by the BACnet Trend Log object. In this case the AccessLevel can also have the Readable flag set.

Table 40 – Log_Buffer Attribute definition

OPC UA Attribute	Value
BrowseName	Log_Buffer
AccessLevel	HistoryReadable
Historizing	True if BACnet property Enable is True and the current time is between the BACnet property values Start_Time and Stop_Time

This OPC UA ObjectType represents an object that monitors one or more properties of one or more referenced objects and logs the values and timestamps into an internal buffer when a set of pre-defined conditions are met.

Figure 32 shows an overview for the BACnetTrendLogMultipleType with its Properties and related ObjectTypes. It is formally defined in Table 41.

Figure 32 – BACnetTrendLogMultipleType overview

The BACnetTrendLogMultipleType ObjectType is formally defined in Table 41.

Table 41 – BACnetTrendLogMultipleType Definition

Attribute		Value
BrowseName		BACnetTrendLogMultipleType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetTrendLogBaseType defined in 7.20.3.10.
0:HasProperty	Variable		Log_DeviceObjectProperty	BACnetDeviceObjectPropertyReference [ ]	0:PropertyType	O
0:HasComponent	Variable		Log_Buffer	BaseDataType[]	0:BaseDataVariableType	M

The BACnetTrendLogMultipleType ObjectType is a concrete type and can be used directly.

This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference [], represents the BACnet property Log_DeviceObjectProperty. The BACnetDeviceObjectPropertyReference DataType is defined in 10.5.9.

The Log_DeviceObjectProperty array houses the set of properties that will be monitored and subsequently logged. When an element of the array has an object or device instance number equal to 4194303, this indicates that the element is uninitialized. For uninitialized elements, an indication that no property was specified shall be written to the corresponding entry in each log record.

This OPC UA Property, of DataType BACnetLogMultipleRecord, represents the BACnet property Log_Buffer.

This OPC UA ObjectType represents an object that records event notifications with timestamps and other pertinent data into an internal buffer for subsequent retrieval.

Figure 33 shows an overview for the BACnetEventLogType with its Properties and related ObjectTypes. It is formally defined in Table 42.

Figure 33 – BACnetEventLogType overview

The BACnetEventLogType ObjectType is formally defined in Table 42.

Table 42 – BACnetEventLogType Definition

Attribute		Value
BrowseName		BACnetEventLogType
IsAbstract		False
EventNotifier		HistoryRead
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetLogType defined in 7.20.

The BACnetEventLogType ObjectType is a concrete type and can be used directly.

This OPC UA ObjectType represents an object that provides a hierarchical view to the BACnet objects contained in a BACnet device. It is formally defined in Table 43.

The BACnetStructuredViewType ObjectType is formally defined in Table 43.

Table 43 – BACnetStructuredViewType Definition

Attribute		Value
BrowseName		BACnetStructuredViewType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasComponent	Object		<BACnetStructuredView>		BACnetStructuredViewType	OP
0:HasComponent	Object		<BACnetObject>		BACnetObjectType	OP
0:HasProperty	Variable		Node_Type	BACnetNodeType	0:PropertyType	M
0:HasProperty	Variable		Node_Subtype	0:String	0:PropertyType	O
0:HasProperty	Variable		Subordinate_List	BACnetDeviceObjectPropertyReference[]	0:PropertyType	M
0:HasProperty	Variable		Subordinate_Annotations	0:String[]	0:PropertyType	O

The BACnetStructuredViewType ObjectType is an abstract type and cannot be used directly.

All BACnetStructureViews of the Subordinate_List shall be referenced with a 0:HasComponent Reference.

All BACnetObjects of the Subordinate_List shall be referenced with a 0:HasComponent Reference.

This Property represents the type of BACnet node.

This Property is a string of printable characters whose content is not restricted. It provides a more specific classification of the object in the hierarchy of objects, providing a short description of the item represented by the node.

This property is an array of BACnetDeviceObjectPropertyReference that defines the members of the current Structured View.

By including references to 'child' Structured View objects, multilevel hierarchies may be created.

If the optional device identifier is not present for a particular Subordinate_List member, then that object must reside in the same device that maintains the Structured View object. To avoid recursion, it is suggested that a single Structured View object should be referenced only once in the hierarchy. If the size of the Subordinate_List array is changed, the size of the Subordinate_Annotations array, if present, shall also be changed to the same size.

This property, an array of String, shall be used to define a text string description for each member of the Subordinate_List. The content of these strings is not restricted. If the size of this array is changed, the size of the Subordinate_List array shall also be changed to the same size.

The BACnetNotifierType is formally defined in Table 44.

Table 44 – BACnetNotifierType Definition

Attribute		Value
BrowseName		BACnetNotifierType
IsAbstract		True
EventNotifier		SubscribeToEvents
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetObjectType defined in 7.1.
0:HasProperty	Variable		Recipient_List	BACnetDestination	0:PropertyType	M

The BACnetNotifierType ObjectType is an abstract type and cannot be used directly.

This OPC UA Property, of DataType BACnetDestination, represents the BACnet property Recipient_List. The BACnetDestination DataType is defined in 10.5.9.

The BACnetNotificationClass is formally defined in Table 45.

Table 45 – BACnetNotificationClassType Definition

Attribute		Value
BrowseName		BACnetNotificationClassType
IsAbstract		False
EventNotifier		SubscribeToEvents
References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the BACnetNotifierType defined in 7.26.
0:HasProperty	Variable		Notification_Class	0:UInt32	0:PropertyType	M
0:HasProperty	Variable		Priority	0:Byte[3]	0:PropertyType	M
0:HasProperty	Variable		Ack_Required	BACnetEventTransitionBits	0:PropertyType	M

The BACnetNotificationClass ObjectType is a concrete type and can be used directly.

Instances of this ObjectType are used as event notifiers and have the EventNotifier attribute always set to SubscribeToEvents.

This OPC UA Property, of type UInt32, indicates the numeric value of the BACnet Notification Class object used in event initiating objects to refere to the BACnet Notification Class object.

This Property, of type Byte[3], shall convey the priority to be used for event notifications for TO_OFFNORMAL, TO_FAULT, and TO_NORMAL events, respectively. Priorities shall range from 0 - 255 inclusive. A lower number indicates a higher priority.

This OPC UA Property, of DataType BACnetEventTransitionBits, represents the BACnet property Ack_Required. The BACnetEventTransitionBits DataType is defined in 10.3.3.