Figure 4 depicts the main ObjectTypes of the base device model and their relationship. The drawing is not intended to be complete. For the sake of simplicity only a few components and relations were captured to give a rough idea of the overall structure.

Figure 4 – Device model overview

The boxes in this drawing show the ObjectTypes used in this specification as well as some elements from other specifications that help understand some modelling decisions. The upper grey box shows the OPC UA core ObjectTypes from which the TopologyElementType is derived. The grey box in the second level shows the main ObjectTypes that the device model introduces. The components of those ObjectTypes are illustrated only in an abstract way in this overall picture.

The grey box in the third level shows real-world examples as they will be used in products and plants. In general, such subtypes are defined by other organizations.

The TopologyElementType is the base ObjectType for elements in a device topology. Its most essential aspect is the functional grouping concept.

The ComponentType ObjectType provides a generic definition for a Device or parts of a Device where parts include mechanics and/or software. DeviceType is commonly used to represent field Devices.

Modular Devices are introduced to support subdevices and Block Devices to support Blocks. Blocks are typically used by field communication foundations as means to organise the functionality within a Device. Specific types of Blocks will therefore be specified by these foundations.

The ConfigurableObjectType is used as a general means to create modular topology units. If needed an instance of this type will be added to the head object of the modular unit. Modular Devices, for example, will use this ObjectType to organise their modules. Block-oriented Devices use it to expose and organise their Blocks.

Annex C describes guidelines for the usage of the device model as base for creating companion specifications as well as guidelines on how to combine different aspects of the same device – defined in different companion specifications - in one OPC UA application.

This ObjectType defines a generic model for elements in a device or component topology. Among others, it introduces FunctionalGroups, ParameterSet, and MethodSet. Figure 5 shows the TopologyElementType. It is formally defined in Table 8.

Figure 5 – Components of the TopologyElementType

Table 8 – TopologyElementType definition

Attribute	Value
BrowseName	TopologyElementType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseObjectType defined in OPC 10000-5
HasSubtype	ObjectType	ComponentType	Defined in 5.6
HasSubtype	ObjectType	BlockType	Defined in 5.11
HasSubtype	ObjectType	ConnectionPointType	Defined in 6.4
HasComponent	Object	<GroupIdentifier>		FunctionalGroupType	OptionalPlaceholder
HasComponent	Object	Identification		FunctionalGroupType	Optional
HasComponent	Object	Lock		LockingServicesType	Optional
HasComponent	Object	ParameterSet		BaseObjectType	Optional
HasComponent	Object	MethodSet		BaseObjectType	Optional

The TopologyElementType is abstract. There will be no instances of a TopologyElementType itself, but there will be instances of subtypes of this type. In this specification, the term TopologyElement generically refers to an instance of any ObjectType derived from the TopologyElementType.

FunctionalGroups are an essential aspect introduced by the TopologyElementType. FunctionalGroups are used to structure Nodes like Properties, Parameters and Methods according to their application such as configuration, diagnostics, asset management, condition monitoring and others.

FunctionalGroups are specified in 5.4.

A FunctionalGroup called Identification can be used to organise identification information of this TopologyElement (see 5.4.2). Identification information typically includes the Properties defined by the VendorNameplate or TagNameplate Interfaces and additional application specific information.

TopologyElements may also support LockingServices (defined in 8.3.3).

ParameterSet and MethodSet are defined as standard containers for systems that have a flat list of Parameters or Methods with unique names. In such cases, the Parameters are components of the “ParameterSet” as a flat list of Parameters. The Methods are kept the same way in the “MethodSet”. The “ParameterSet” Object is formally defined in Table 9.

Table 9 – ParameterSet definition

Attribute	Value
BrowseName	ParameterSet
References	NodeClass	BrowseName	TypeDefinition	ModellingRule
HasTypeDefinition	ObjectType	BaseObjectType
HasComponent	Variable	<ParameterIdentifier>	BaseDataVariableType	MandatoryPlaceholder

The “MethodSet” Object is formally defined in Table 10.

Table 10 – MethodSet definition

Attribute	Value
BrowseName	MethodSet
References	NodeClass	BrowseName	TypeDefinition	ModellingRule
HasTypeDefinition	ObjectType	BaseObjectType
HasComponent	Method	<MethodIdentifier>		MandatoryPlaceholder

This subtype of the OPC UA FolderType is used to structure Nodes like Properties, Parameters and Methods according to their application (e.g. maintenance, diagnostics, condition monitoring). Organizes References should be used when the elements are components in other parts of the TopologyElement that the FunctionalGroup belongs to. This includes Properties, Variables, and Methods of the TopologyElement or in Objects that are components of the TopologyElement either directly or via a subcomponent. The same Property, Parameter or Method might be useful in different application scenarios and therefore referenced from more than one FunctionalGroup.

FunctionalGroups can be nested.

FunctionalGroups can directly be instantiated. In this case, the BrowseName of a FunctionalGroup should indicate its purpose. A list of recommended BrowseNames is in 5.4.2.

Figure 6 shows the FunctionalGroupType components. It is formally defined in Table 11.

Figure 6 – FunctionalGroupType

Table 11 – FunctionalGroupType definition

Attribute	Value
BrowseName	FunctionalGroupType
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the FolderType defined in OPC 10000-5
HasComponent	Object	<GroupIdentifier>		FunctionalGroupType	OptionalPlaceholder
HasComponent	Variable	UIElement	BaseDataType	UIElementType	Optional

All BrowseNames for Nodes referenced by a FunctionalGroup with an Organizes Reference shall be unique.

The Organizes References may be present only at the instance, not the type. Depending on the current state of the TopologyElement the Server may decide to hide or unhide certain FunctionalGroups or (part of) their References. If a FunctionalGroup may be hidden on an instance the TypeDefinition shall use an appropriate ModellingRule like “Optional”.

If desirable, Nodes can be also children of FunctionalGroups. If such Nodes are defined, it is recommended to define a subtype of the FunctionalGroupType.

UIElement is the user interface element for this FunctionalGroup. See 5.4.3 for the definition of UIElements.

Examples in Annex B.1 illustrate the use of FunctionalGroups.

Table 12 includes a list of FunctionalGroups with name and purpose. If Servers expose a FunctionalGroup that corresponds to the described purpose, they should use the recommended BrowseName with the Namespace of this specification.

Table 12 – Recommended FunctionalGroup BrowseNames

BrowseName	Purpose
Configuration	Parameters representing the configuration items of the TopologyElement. If the CurrentWrite bit is set in the AccessLevel Attribute they can be modified by Clients.
Tuning	Parameters and Methods to optimize the behavior of the TopologyElement.
Maintenance	Parameters and Methods useful for maintenance operations.
Diagnostics	Parameters and Methods for diagnostics.
Statistics	Parameters and Methods for statistics.
Status	Parameters which describe the general health of the TopologyElement. This can include diagnostic Parameters.
Operational	Parameters and Methods useful for during normal operation, like process data.
Identification	The Properties of the VendorNameplate Interface, like Manufacturer, SerialNumber or Properties of the TagNameplate will usually be sufficient as identification. If other Parameters or even Methods are required, all elements needed shall be organised in a FunctionalGroup called Identification. See Annex B.1 for an example.

Servers can expose UIElements providing user interfaces in the context of their FunctionalGroup container. Clients can load such a user interface and display it on the Client side. The hierarchy of FunctionalGroups represents the tree of user interface elements.

The UIElementType is abstract and is mainly used as filter when browsing a FunctionalGroup. Only subtypes can be used for instances. No concrete UIElements are defined in this specification. FDI (Field Device Integration, see IEC 62769) specifies two concrete subtypes

• UIDs (UI Descriptions), descriptive user interface elements, and
• UIPs (UI Plug-Ins), programmed user interface elements.

The UIElementType is specified in Table 13.

Table 13 – UIElementType definition

Attribute	Value
BrowseName	UIElementType
IsAbstract	True
DataType	BaseDataType
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in OPC 10000-5.

The Value attribute of the UIElement contains the user interface element. Subtypes have to define the DataType (e.g. XmlElement or ByteString).

This clause describes Interfaces with specific functionality that may be applied to multiple types at arbitrary positions in the type hierarchy.

Interfaces are defined in OPC 10001-7.

Figure 7 shows the Interfaces described in this specification.

Figure 7 – Overview of Interfaces for Devices and Device components

IVendorNameplateType includes Properties that are commonly used to describe a TopologyElement from a manufacturer point of view. They can be used as part of the identification. The Values of these Properties are typically provided by the component vendor.

The VendorNameplate Interface is illustrated in Figure 8 and formally defined in Table 14.

Figure 8 – VendorNameplate Interface

Table 14 – IVendorNameplateType definition

Attribute	Value
BrowseName	IVendorNameplateType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseInterfaceType defined in OPC 10001-7
Product-specific Properties
HasProperty	Variable	Manufacturer	LocalizedText	PropertyType	Optional
HasProperty	Variable	ManufacturerUri	String	PropertyType	Optional
HasProperty	Variable	Model	LocalizedText	PropertyType	Optional
HasProperty	Variable	ProductCode	String	PropertyType	Optional
HasProperty	Variable	HardwareRevision	String	PropertyType	Optional
HasProperty	Variable	SoftwareRevision	String	PropertyType	Optional
HasProperty	Variable	DeviceRevision	String	PropertyType	Optional
HasProperty	Variable	DeviceManual	String	PropertyType	Optional
HasProperty	Variable	DeviceClass	String	PropertyType	Optional
Product instance-specific Properties
HasProperty	Variable	SerialNumber	String	PropertyType	Optional
HasProperty	Variable	ProductInstanceUri	String	PropertyType	Optional
HasProperty	Variable	RevisionCounter	Int32	PropertyType	Optional

Product type specific Properties:

Manufacturer provides the name of the company that manufactured the item this Interface is applied to. ManufacturerUri provides a unique identifier for this company. This identifier should be a fully qualified domain name; however, it may be a GUID or similar construct that ensures global uniqueness.

Model provides the name of the product.

ProductCode provides a unique combination of numbers and letters used to identify the product. It may be the order information displayed on type shields or in ERP systems.

HardwareRevision provides the revision level of the hardware.

SoftwareRevision provides the version or revision level of the software component, the software/firmware of a hardware component, or the software/firmware of the Device.

DeviceRevision provides the overall revision level of a hardware component or the Device. As an example, this Property can be used in ERP systems together with the ProductCode Property.

DeviceManual allows specifying an address of the user manual. It may be a pathname in the file system or a URL (Web address).

DeviceClass indicates in which domain or for what purpose a certain item for which the Interface is applied is used. Examples are “ProgrammableController”, “RemoteIO”, and “TemperatureSensor”. This standard does not predefine any DeviceClass names. More specific standards that utilize this Interface will likely introduce such classifications (e.g. IEC 62769, OPC 30000, or OPC 10020).

Product instance specific Properties:

SerialNumber is a unique production number provided by the manufacturer. This is often stamped on the outside of a physical component and may be used for traceability and warranty purposes.

ProductInstanceUri is a globally unique resource identifier provided by the manufacturer. This is often stamped on the outside of a physical component and may be used for traceability and warranty purposes. The maximum length is 255 characters. The recommended syntax of the ProductInstanceUri is: <ManufacturerUri>/<any string> where <any string> is unique among all instances using the same ManufacturerUri.

Examples: “some-company.com/5ff40f78-9210-494f-8206-c2c082f0609c”, “some-company.com/snr-16273849” or “some-company.com/model-xyz/snr-16273849”.

RevisionCounter is an incremental counter indicating the number of times the configuration data has been modified. An example would be a temperature sensor where the change of the unit would increment the RevisionCounter but a change of the measurement value would not affect the RevisionCounter.

Companion specifications may specify additional semantics for the contents of these Properties.

Table 15 specifies the mapping of these Properties to the International Registration Data Identifiers (IRDI) defined in ISO/ICE 11179-6. They should be used if a Server wants to expose a dictionary reference as defined in OPC 10001-5.

Table 15 – VendorNameplate Mapping to IRDIs

Property	IRDI
Manufacturer	0112/2///61987#ABA565 - manufacturer
ManufacturerUri	-
Model	0112/2///61987#ABA567 - name of product
SerialNumber	0112/2///61987#ABA951 - serial number
HardwareRevision	0112/2///61987#ABA926 - hardware version
SoftwareRevision	0112/2///61987#ABA601 - software version
DeviceRevision	-
RevisionCounter	-
ProductCode	0112/2///61987#ABA300 – code of product
ProductInstanceUri	-
DeviceManual	-
DeviceClass	0112/2///61987#ABA566 - type of product

ITagNameplateType includes Properties that are commonly used to describe a TopologyElement from a user point of view.

The TagNameplate Interface is illustrated in Figure 9 and formally defined in Table 16.

Figure 9 – TagNameplate Interface

Table 16 – ITagNameplateType definition

Attribute	Value
BrowseName	ITagNameplateType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseInterfaceType defined in OPC 10001-7
HasProperty	Variable	AssetId	String	PropertyType	Optional
HasProperty	Variable	ComponentName	LocalizedText	PropertyType	Optional

AssetId is a user writable alphanumeric character sequence uniquely identifying a component. The ID is provided by the integrator or user of the device. It contains typically an identifier in a branch, use case or user specific naming scheme. This could be for example a reference to an electric scheme.

ComponentName is a user writable name provided by the integrator or user of the component.

Table 17 specifies the mapping of these Properties to the International Registration Data Identifiers (IRDI) defined in ISO/ICE 11179-6. They should be used if a Server wants to expose a dictionary reference as defined in OPC 10001-5.

Table 17 – TagNameplate Mapping to IRDIs

Property	IRDI
AssetId	0112/2///61987#ABA038 - identification code of device
ComponentName	0112/2///61987#ABA251 - designation of device

The DeviceHealth Interface includes Properties and Alarms that are commonly used to expose the health status of a Device. It is illustrated in Figure 10 and formally defined in Table 18.

Figure 10 – DeviceHealth Interface

Table 18 – IDeviceHealthType definition

Attribute	Value
BrowseName	IDeviceHealthType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseInterfaceType defined in OPC 10001-7
HasComponent	Variable	DeviceHealth	DeviceHealthEnumeration	BaseDataVariableType	Optional
HasComponent	Object	DeviceHealthAlarms		FolderType	Optional

DeviceHealth indicates the status as defined by NAMUR Recommendation NE107. Clients can read or monitor this Variable to determine the device condition.

The DeviceHealthEnumeration DataType is an enumeration that defines the device condition. Its values are defined in Table 19.

Table 19 – DeviceHealthEnumeration values

Name	Value	Description
NORMAL	0	The Device functions normally.
FAILURE	1	Malfunction of the Device or any of its peripherals. Typically caused device-internal or is process related.
CHECK_FUNCTION	2	Functional checks are currently performed. Examples: Change of configuration, local operation, and substitute value entered.
OFF_SPEC	3	"Off-spec" means that the Device is operating outside its specified range (e.g. measuring or temperature range) or that internal diagnoses indicate deviations from measured or set values due to internal problems in the Device or process characteristics.
MAINTENANCE_REQUIRED	4	Although the output signal is valid, the wear reserve is nearly exhausted or a function will soon be restricted due to operational conditions e.g. build-up of deposits

DeviceHealthAlarms shall be used for instances of the DeviceHealth Alarm Types specified in 5.12.

The SupportInfo Interface defines a number of additional data that a commonly exposed for Devices and their components. These include mainly images, documents, or protocol-specific data. The various types of information is organised into different folders. Each information element is represented by a read-only Variable. The information can be retrieved by reading the Variable value.

Figure 11 Illustrates the SupportInfo Interface. It is formally defined in Table 20.

Figure 11 –Support information Interface

Table 20 – ISupportInfoType definition

Attribute	Value
BrowseName	ISupportInfoType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseInterfaceType defined in OPC 10001-7
HasComponent	Object	DeviceTypeImage		FolderType	Optional
HasComponent	Object	Documentation		FolderType	Optional
HasComponent	Object	ProtocolSupport		FolderType	Optional
HasComponent	Object	ImageSet		FolderType	Optional

Clients need to be aware that the contents that these Variables represent may be large. Reading large values with a single Read operation may not be possible due to configured limits in either the Client or the Server stack. The default maximum size for an array of bytes is 1 megabyte. It is recommended that Clients use the IndexRange in the OPC UA Read Service (see OPC 10000-4) to read these Variables in chunks, for example, one-megabyte chunks. It is up to the Client whether it starts without an index and repeats with an IndexRange only after an error or whether it always uses an IndexRange.

The different types of support information are specified in 5.5.5.2 to 5.5.5.5.

Pictures can be exposed as Variables organised in the DeviceTypeImage folder. There may be multiple images of different resolutions. Each image is a separate Variable. The “DeviceTypeImage” Folder is formally defined in Table 21.

Table 21 – DeviceTypeImage definition

Attribute	Value
BrowseName	DeviceTypeImage
References	NodeClass	BrowseName	TypeDefinition	DataType	ModellingRule
HasTypeDefinition	ObjectType	FolderType (defined in OPC 10000-5.)
HasComponent	Variable	<ImageIdentifier>	BaseDataVariableType	Image	MandatoryPlaceholder

All images are transferred as a ByteString. The DataType of the Variable specifies the image format. OPC UA defines BMP, GIF, JPG and PNG (see OPC 10000-3).

Documents are exposed as Variables organized in the Documentation folder. In most cases they will represent a product manual, which can exist as a set of individual documents. The “Documentation” Folder is formally defined in Table 22.

Table 22 – Documentation definition

Attribute	Value
BrowseName	Documentation
References	NodeClass	BrowseName	TypeDefinition	DataType	ModellingRule
HasTypeDefinition	ObjectType	FolderType (defined in OPC 10000-5.)
HasComponent	Variable	<DocumentIdentifier>	BaseDataVariableType	ByteString	MandatoryPlaceholder

All documents are transferred as a ByteString. The BrowseName of each Variable will consist of the filename including the extension that can be used to identify the document type. Typical extensions are “.pdf” or “.txt”.

Protocol support files are exposed as Variables organised in the ProtocolSupport folder. They may represent various types of information as defined by a protocol. Examples are a GSD or a CFF file. The “ProtocolSupport” Folder is formally defined in Table 23.

Table 23 – ProtocolSupport definition

Attribute	Value
BrowseName	ProtocolSupport
References	NodeClass	BrowseName	TypeDefinition	DataType	ModellingRule
HasTypeDefinition	ObjectType	FolderType (defined in OPC 10000-5)
HasComponent	Variable	<ProtocolSupportIdentifier>	BaseDataVariableType	ByteString	MandatoryPlaceholder

All protocol support files are transferred as a ByteString. The BrowseName of each Variable shall consist of the complete filename including the extension that can be used to identify the type of information.

Images that are used within UIElements are exposed as separate Variables rather than embedding them in the element. All image Variables will be aggregated by the ImageSet folder. The UIElement shall specify an image by its name that is also the BrowseName of the image Variable. Clients can cache images so they don't have to be transferred more than once. The “ImageSet” Folder is formally defined in Table 24.

Table 24 – ImageSet definition

Attribute	Value
BrowseName	ImageSet
References	NodeClass	BrowseName	TypeDefinition	DataType	ModellingRule
HasTypeDefinition	ObjectType	FolderType (defined in OPC 10000-5.)
HasComponent	Variable	<ImageIdentifier>	BaseDataVariableType	Image	MandatoryPlaceholder

The DataType of the Variable specifies the image format. OPC UA defines BMP, GIF, JPG and PNG (see OPC 10000-3).

Compared to DeviceType the ComponentType is more universal. It includes the same components but does not mandate any Properties. This makes it usable for representation of a Device or parts of a Device. Parts include both mechanical and software parts.

The ComponentType applies the VendorNameplate and the TagNameplate Interface. Figure 12 Illustrates the ComponentType. It is formally defined in Table 25.

Figure 12 – ComponentType

Table 25 – ComponentType definition

Attribute	Value
BrowseName	ComponentType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the TopologyElementType defined in 5.3.
HasSubtype	ObjectType	DeviceType	Defined in 5.7.
HasSubtype	ObjectType	SoftwareType	Defined in 5.8.
HasInterface	ObjectType	IVendorNameplateType	Defined in 5.5.2.
HasInterface	ObjectType	ITagNameplateType	Defined in 5.5.3.
Applied from IVendorNameplateType
HasProperty	Variable	Manufacturer	LocalizedText	PropertyType	Optional
HasProperty	Variable	ManufacturerUri	String	PropertyType	Optional
HasProperty	Variable	Model	LocalizedText	PropertyType	Optional
HasProperty	Variable	ProductCode	String	PropertyType	Optional
HasProperty	Variable	HardwareRevision	String	PropertyType	Optional
HasProperty	Variable	SoftwareRevision	String	PropertyType	Optional
HasProperty	Variable	DeviceRevision	String	PropertyType	Optional
HasProperty	Variable	DeviceManual	String	PropertyType	Optional
HasProperty	Variable	DeviceClass	String	PropertyType	Optional
HasProperty	Variable	SerialNumber	String	PropertyType	Optional
HasProperty	Variable	ProductInstanceUri	String	PropertyType	Optional
HasProperty	Variable	RevisionCounter	Int32	PropertyType	Optional
Applied from ITagNameplateType
HasProperty	Variable	AssetId	String	PropertyType	Optional
HasProperty	Variable	ComponentName	LocalizedText	PropertyType	Optional

The ComponentType is abstract. DeviceType and SoftwareType are subtypes of ComponentType. There will be no instances of a ComponentType itself, only of concrete subtypes.

IVendorNameplateType and its members are described in 5.5.2.

ITagNameplateType and its members are described in 5.5.3.

This ObjectType can be used to define the structure of a Device. Figure 13 shows the DeviceType. It is formally defined in Table 26.

Figure 13 – DeviceType

Table 26 – DeviceType definition

Attribute	Value
BrowseName	DeviceType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ComponentType defined in 5.6
HasInterface	ObjectType	ISupportInfoType		Defined in 5.5.3.
HasInterface	ObjectType	IDeviceHealthType		Defined in 5.5.3.
HasComponent	Object	<CPIdentifier>		ConnectionPointType	OptionalPlaceholder
HasProperty	Variable	SerialNumber	String	PropertyType	Mandatory
HasProperty	Variable	RevisionCounter	Int32	PropertyType	Mandatory
HasProperty	Variable	Manufacturer	LocalizedText	PropertyType	Mandatory
HasProperty	Variable	Model	LocalizedText	PropertyType	Mandatory
HasProperty	Variable	DeviceManual	String	PropertyType	Mandatory
HasProperty	Variable	DeviceRevision	String	PropertyType	Mandatory
HasProperty	Variable	SoftwareRevision	String	PropertyType	Mandatory
HasProperty	Variable	HardwareRevision	String	PropertyType	Mandatory
HasProperty	Variable	DeviceClass	String	PropertyType	Optional
HasProperty	Variable	ManufacturerUri	String	PropertyType	Optional
HasProperty	Variable	ProductCode	String	PropertyType	Optional
HasProperty	Variable	ProductInstanceUri	String	PropertyType	Optional
Applied from IDeviceHealthType
HasComponent	Variable	DeviceHealth	DeviceHealthEnumeration	BaseDataVariableType	Optional
HasComponent	Object	DeviceHealthAlarms		FolderType	Optional
Applied from ISupportInfoType
HasComponent	Object	DeviceTypeImage		FolderType	Optional
HasComponent	Object	Documentation		FolderType	Optional
HasComponent	Object	ProtocolSupport		FolderType	Optional
HasComponent	Object	ImageSet		FolderType	Optional

DeviceType is a subtype of ComponentType which means it inherits all InstanceDeclarations.

The DeviceType ObjectType is abstract. There will be no instances of a DeviceType itself, only of concrete subtypes.

ConnectionPoints (see 6.4) represent the interface (interface card) of a DeviceType instance to a Network. Multiple ConnectionPoints may exist if multiple protocols and/or multiple Communication Profiles are supported.

The Interfaces and their members are described in 5.5. Some of the Properties inherited from the ComponentType are declared mandatory for backward compatibility.

Although mandatory, some of the Properties may not be supported for certain types of Devices. In this case vendors shall provide the following defaults:

• Properties with DataType String: empty string
• Properties with DataType LocalizedText: empty text field
• RevisionCounter Property: - 1

Clients can ignore the Properties when they have these defaults.

When Properties are not supported, Servers should initialize the corresponding Property declaration on the DeviceType with the default value. Relevant Browse Service requests can then return a Reference to this Property on the type definition. That way, no extra Nodes are needed.

This ObjectType can be used for software modules of a Device or a part of a Device. SoftwareType is a concrete subtype of ComponentType and can be used directly.

Figure 14 Illustrates the SoftwareType. It is formally defined in Table 27.

Figure 14 – SoftwareType

Table 27 – SoftwareType definition

Attribute	Value
BrowseName	SoftwareType
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ComponentType defined in 5.6.
HasProperty	Variable	Manufacturer	LocalizedText	PropertyType	Mandatory
HasProperty	Variable	Model	LocalizedText	PropertyType	Mandatory
HasProperty	Variable	SoftwareRevision	String	PropertyType	Mandatory

SoftwareType is a subtype of ComponentType which means it inherits all InstanceDeclarations.

The Properties Manufacturer, Model, and SoftwareRevision inherited from ComponentType are declared mandatory for SoftwareType instances.

The DeviceSet Object is the starting point to locate Devices. It shall either directly or indirectly reference all instances of a subtype of ComponentType with a Hierarchical Reference. For complex Devices that are composed of various components that are also Devices, only the root instance shall be referenced from the DeviceSet Object. The components of such complex Devices shall be locatable by following Hierarchical References from the root instance. An example is the Modular Device defined in 9.4 and also illustrated in Figure 15.

Examples:

• UA Server represents a monolithic or modular Device: DeviceSet only contains one instance
• UA Server represents a host system that has access to a number of Devices that it manages: DeviceSet contains several instances that the host provides access to.
• UA Server represents a gateway Device that acts as representative for Devices that it has access to: DeviceSet contains the gateway Device instance and instances for the Devices that it represents.
• UA Server represents a robotic system consisting of mechanics and controls. DeviceSet only contains the instance for the root of the robotic system. The mechanics and controls are represented by ComponentType instances which are organised as sub-components of the root instance.

Figure 15 shows the AddressSpace organisation with this standard entry point and examples.

Figure 15 – Standard entry point for Devices

The DeviceSet Node is formally defined in Table 28.

Table 28 – DeviceSet definition

Attribute	Value
BrowseName	DeviceSet
References	NodeClass	BrowseName	TypeDefinition
OrganizedBy by the Objects Folder defined in OPC 10000-5
HasTypeDefinition	ObjectType	BaseObjectType

The DeviceFeatures Object can be used to organise other functional entities that are related to the Devices referenced by the DeviceSet. Companion specifications may standardize such instances and their BrowseNames. Figure 16 shows the AddressSpace organisation with this standard entry point.

Figure 16 – Standard entry point for DeviceFeatures

The DeviceFeatures Node is formally defined in Table 29.

Table 29 – DeviceFeatures definition

Attribute	Value
BrowseName	DeviceFeatures
References	NodeClass	BrowseName	TypeDefinition
OrganizedBy by the DeviceSet Object defined in 5.9
HasTypeDefinition	ObjectType	BaseObjectType

This ObjectType defines the structure of a Block Object. Figure 17 depicts the BlockType hierarchy. It is formally defined in Table 30.

Figure 17 – BlockType hierarchy

FFBlockType and PROFIBlockType are examples. They are not further defined in this specification. It is expected that industry groups will standardize general purpose BlockTypes.

Table 30 – BlockType definition

Attribute	Value
BrowseName	BlockType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the TopologyElementType defined in 5.2
HasProperty	Variable	RevisionCounter	Int32	PropertyType	Optional
HasProperty	Variable	ActualMode	LocalizedText	PropertyType	Optional
HasProperty	Variable	PermittedMode	LocalizedText[]	PropertyType	Optional
HasProperty	Variable	NormalMode	LocalizedText[]	PropertyType	Optional
HasProperty	Variable	TargetMode	LocalizedText[]	PropertyType	Optional

BlockType is a subtype of TopologyElementType and inherits the elements for Parameters, Methods and FunctionalGroups.

The BlockType is abstract. There will be no instances of a BlockType itself, but there will be instances of subtypes of this Type. In this specification, the term Block generically refers to an instance of any subtype of the BlockType.

The RevisionCounter is an incremental counter indicating the number of times the static data within the Block has been modified. A value of -1 indicates that no revision information is available.

The following Properties refer to the Block Mode (e.g. “Manual”, “Out of Service”).

The ActualMode Property reflects the current mode of operation.

The PermittedMode defines the modes of operation that are allowed for the Block based on application requirements.

The NormalMode is the mode the Block should be set to during normal operating conditions. Depending on the Block configuration, multiple modes may exist.

The TargetMode indicates the mode of operation that is desired for the Block. Depending on the Block configuration, multiple modes may exist.

The DeviceHealth Property defined in 5.5.4 provides a basic way to expose the health state of a device based on NAMUR NE 107.

This section defines AlarmTypes that can be used to indicate an abnormal device condition together with diagnostic information text as defined by NAMUR NE 107 as well as additional manufacturer specific information.

Figure 18 informally describes the AlarmTypes for DeviceHealth.

Figure 18 – Device Health Alarm type hierarchy

The DeviceHealthDiagnosticAlarmType is a specialization of the InstrumentDiagnosticAlarmType intended to represent abnormal device conditions as defined by NAMUR NE 107. This type can be used in filters for monitored items. Only subtypes of this type will be used in actual implementations. The Alarm becomes active when the device condition is abnormal. It is formally defined in Table 31.

Table 31 – DeviceHealthDiagnosticAlarmType definition

Attribute	Value
BrowseName	DeviceHealthDiagnosticAlarmType
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the InstrumentDiagnosticAlarmType defined in OPC 10000-9.
HasSubtype	ObjectType	FailureAlarmType	Defined in clause 5.12.3
HasSubtype	ObjectType	CheckFunctionAlarmType	Defined in clause 5.12.4
HasSubtype	ObjectType	OffSpecAlarmType	Defined in clause 5.12.5
HasSubtype	ObjectType	MaintenanceRequiredAlarmType	Defined in clause 5.12.6

Conditions of subtypes of DeviceHealthDiagnosticAlarmType become active when the device enters the corresponding abnormal state.

The Message field in the Event notification shall be used for additional information associated with the health status (e.g. the possible cause of the abnormal state and suggested actions to return to normal).

A Device may be in more than one abnormal state at a time in which case multiple Conditions will be active.

The FailureAlarmType is formally defined in Table 32.

Table 32 – FailureAlarmType definition

Attribute	Value
BrowseName	FailureAlarmType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the DeviceHealthDiagnosticAlarmType defined in 5.12.2.

The CheckFunctionAlarmType is formally defined in Table 33.

Table 33 – CheckFunctionAlarmType definition

Attribute	Value
BrowseName	CheckFunctionAlarmType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the DeviceHealthDiagnosticAlarmType defined in 5.12.2.

The OffSpecAlarmType is formally defined in Table 34.

Table 34 – OffSpecAlarmType definition

Attribute	Value
BrowseName	OffSpecAlarmType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the DeviceHealthDiagnosticAlarmType defined in 5.12.2.

The MaintenanceRequiredAlarmType is formally defined in Table 35.

Table 35 – MaintenanceRequiredAlarmType definition

Attribute	Value
BrowseName	MaintenanceRequiredAlarmType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the DeviceHealthDiagnosticAlarmType defined in 5.12.2.