UA Part 5: Information Model - 7 Standard VariableTypes

Typically, the components of a complex VariableType are fixed and can be extended by subtyping. However, because each Variable of a VariableType can be extended with additional components this standard allows the extension of the standard VariableTypes defined in this document with additional components. This allows the expression of additional information in the type definition that would be contained in each Variable anyway. However, it is not allowed to restrict the components of the standard VariableTypes defined in this International Standard. An example of extending VariableTypes would be putting the standard Property NodeVersion, defined in OPC 10000-3, into the BaseDataVariableType, stating that each DataVariable of the Server will provide a NodeVersion.

7.2 BaseVariableType

The BaseVariableType is the abstract base type for all other VariableTypes. However, only the PropertyType and the BaseDataVariableType directly inherit from this type.

There are no References specified for this VariableType. It is formally defined in Table 70.

Table 70 – BaseVariableType definition

Attribute		Value
BrowseName		BaseVariableType
IsAbstract		True
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Conformance Units
Base Info Base Types

7.3 PropertyType

The PropertyType is a subtype of the BaseVariableType. It is used as the type definition for all Properties. Properties are defined by their BrowseName and therefore they do not need a specialised type definition. It is not allowed to subtype this VariableType.

There are no References specified for this VariableType. It is formally defined in Table 71.

Table 71 – PropertyType definition

Attribute		Value
BrowseName		PropertyType
IsAbstract		False
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseVariableType defined in 7.2.
Conformance Units
Base Info Base Types

7.4 BaseDataVariableType

The BaseDataVariableType is a subtype of the BaseVariableType. It is used as the type definition whenever there is a DataVariable having no more concrete type definition available. This VariableType is the base VariableType for VariableTypes of DataVariables, and all other VariableTypes of DataVariables shall either directly or indirectly inherit from it.

There are no References specified for this VariableType. It is formally defined in Table 72.

Table 72 – BaseDataVariableType definition

Attribute		Value
BrowseName		BaseDataVariableType
IsAbstract		False
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		BrowseName	Comment
Subtype of the BaseVariableType defined in 7.2.
Conformance Units
Base Info Base Types

7.5 ServerVendorCapabilityType

This VariableType is an abstract type whose subtypes define capabilities of the Server. Vendors may define subtypes of this type. This VariableType is formally defined in Table 73.

Table 73 – ServerVendorCapabilityType definition

Attribute		Value
BrowseName		ServerVendorCapabilityType
IsAbstract		True
ValueRank		−1 (−1 = Scalar)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
Conformance Units
Base Info ServerType

7.6 ServerStatusType

This complex VariableType is used for information about the Server status. Its DataVariables reflect its DataType having the same semantic defined in 12.10. The VariableType is formally defined in Table 74.

Table 74 – ServerStatusType definition

Attribute		Value
BrowseName		ServerStatusType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		ServerStatusDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		StartTime	UtcTime	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentTime	UtcTime	BaseDataVariableType	Mandatory
HasComponent	Variable		State	ServerState	BaseDataVariableType	Mandatory
HasComponent	Variable		BuildInfo	BuildInfo	BuildInfoType	Mandatory
HasComponent	Variable		SecondsTillShutdown	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		ShutdownReason	LocalizedText	BaseDataVariableType	Mandatory
NOTE Containing Objects and Variables of these Objects and Variables are defined by their BrowseName defined in the corresponding TypeDefinitionNode. The NodeId is defined by the composed symbolic name described in 4.1.
Conformance Units
Base Info ServerType

7.7 BuildInfoType

This complex VariableType is used for information about the Server status. Its DataVariables reflect its DataType having the same semantic defined in 12.3.15.1. The VariableType is formally defined in Table 75.

Table 75 – BuildInfoType definition

Attribute		Value
BrowseName		BuildInfoType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		BuildInfo
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		ProductUri	String	BaseDataVariableType	Mandatory
HasComponent	Variable		ManufacturerName	String	BaseDataVariableType	Mandatory
HasComponent	Variable		ProductName	String	BaseDataVariableType	Mandatory
HasComponent	Variable		SoftwareVersion	String	BaseDataVariableType	Mandatory
HasComponent	Variable		BuildNumber	String	BaseDataVariableType	Mandatory
HasComponent	Variable		BuildDate	UtcTime	BaseDataVariableType	Mandatory
Conformance Units
Base Info ServerType

7.8 ServerDiagnosticsSummaryType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType having the same semantic defined in 12.9. The VariableType is formally defined in Table 76.

Table 76 – ServerDiagnosticsSummaryType definition

Attribute		Value
BrowseName		ServerDiagnosticsSummaryType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		ServerDiagnosticsSummaryDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		ServerViewCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CumulatedSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SecurityRejectedSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RejectedSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SessionTimeoutCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SessionAbortCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishingIntervalCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentSubscriptionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CumulatedSubscriptionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SecurityRejectedRequestsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RejectedRequestsCount	UInt32	BaseDataVariableType	Mandatory
Conformance Units
Base Info ServerType

7.9 SamplingIntervalDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array, instances of this type will provide a Variable of the SamplingIntervalDiagnosticsType VariableType having the sampling rate as BrowseName. The VariableType is formally defined in Table 77.

Table 77 – SamplingIntervalDiagnosticsArrayType definition

Attribute		Value
BrowseName		SamplingIntervalDiagnosticsArrayType
IsAbstract		False
ValueRank		1 (1 = OneDimension)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		SamplingIntervalDiagnosticsDataType
References	NodeClass	BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SamplingIntervalDiagnostics	SamplingIntervalDiagnosticsDataType SamplingIntervalDiagnosticsType	ExposesItsArray
Conformance Units
Base Info ServerType

7.10 SamplingIntervalDiagnosticsType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.8. The VariableType is formally defined in Table 78.

Table 78 – SamplingIntervalDiagnosticsType definition

Attribute			Value
BrowseName			SamplingIntervalDiagnosticsType
IsAbstract			False
ValueRank			−1 (−1 = Scalar)
DataType			SamplingIntervalDiagnosticsDataType
References	NodeClass	BrowseName		DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SamplingInterval		Duration	BaseDataVariableType	Mandatory
HasComponent	Variable	SampledMonitoredItemsCount		UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable	MaxSampledMonitoredItemsCount		UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable	DisabledMonitoredItemsSamplingCount		UInt32	BaseDataVariableType	Mandatory
Conformance Units
Base Info ServerType

7.11 SubscriptionDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array, instances of this type will provide a Variable of the SubscriptionDiagnosticsType VariableType having the SubscriptionId as BrowseName. The VariableType is formally defined in Table 79.

Table 79 – SubscriptionDiagnosticsArrayType definition

Attribute			Value
BrowseName			SubscriptionDiagnosticsArrayType
IsAbstract			False
ValueRank			1 (1 = OneDimension)
ArrayDimensions			{0} (0 = UnknownSize)
DataType			SubscriptionDiagnosticsDataType
References	NodeClass	BrowseName		DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SubscriptionDiagnostics		SubscriptionDiagnosticsDataType SubscriptionDiagnosticsType	ExposesItsArray
Conformance Units
Base Info ServerType

7.12 SubscriptionDiagnosticsType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.15. The VariableType is formally defined in Table 80.

Table 80 – SubscriptionDiagnosticsType definition

Attribute		Value
BrowseName		SubscriptionDiagnosticsType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		SubscriptionDiagnosticsDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionId	NodeId	BaseDataVariableType	Mandatory
HasComponent	Variable		SubscriptionId	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		Priority	Byte	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishingInterval	Duration	BaseDataVariableType	Mandatory
HasComponent	Variable		MaxKeepAliveCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MaxLifetimeCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MaxNotificationsPerPublish	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishingEnabled	Boolean	BaseDataVariableType	Mandatory
HasComponent	Variable		ModifyCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		EnableCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DisableCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishMessageRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishMessageCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		TransferRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		TransferredToAltClientCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		TransferredToSameClientCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DataChangeNotificationsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		EventNotificationsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		NotificationsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		LatePublishRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentKeepAliveCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentLifetimeCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		UnacknowledgedMessageCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DiscardedMessageCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MonitoredItemCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DisabledMonitoredItemCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MonitoringQueueOverflowCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		NextSequenceNumber	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		EventQueueOverflowCount	UInt32	BaseDataVariableType	Mandatory
Conformance Units
Base Info ServerType

7.13 SessionDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array instances of this type will provide a Variable of the SessionDiagnosticsVariableType VariableType, having the SessionDiagnostics as BrowseName. Those Variables will also be referenced by the SessionDiagnostics Objects defined by their type in 6.3.5. The VariableType is formally defined in Table 81.

Table 81 – SessionDiagnosticsArrayType definition

Attribute		Value
BrowseName		SessionDiagnosticsArrayType
IsAbstract		False
ValueRank		1 (1 = OneDimension)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		SessionDiagnosticsDataType
References	NodeClass		BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionDiagnostics	SessionDiagnosticsDataType SessionDiagnosticsVariableType	ExposesItsArray
Conformance Units
Base Info ServerType

7.14 SessionDiagnosticsVariableType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.11. The VariableType is formally defined in Table 82.

Table 82 – SessionDiagnosticsVariableType definition

Attribute		Value
BrowseName		SessionDiagnosticsVariableType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		SessionDiagnosticsDataType
References	NodeClass		BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionId	NodeId BaseDataVariableType	Mandatory
HasComponent	Variable		SessionName	String BaseDataVariableType	Mandatory
HasComponent	Variable		ClientDescription	ApplicationDescription BaseDataVariableType	Mandatory
HasComponent	Variable		ServerUri	String BaseDataVariableType	Mandatory
HasComponent	Variable		EndpointUrl	String BaseDataVariableType	Mandatory
HasComponent	Variable		LocaleIds	LocaleId[] BaseDataVariableType	Mandatory
HasComponent	Variable		MaxResponseMessageSize	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable		ActualSessionTimeout	Duration BaseDataVariableType	Mandatory
HasComponent	Variable		ClientConnectionTime	UtcTime BaseDataVariableType	Mandatory
HasComponent	Variable		ClientLastContactTime	UtcTime BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentSubscriptionsCount	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentMonitoredItemsCount	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentPublishRequestsInQueue	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable		TotalRequestCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		UnauthorizedRequestCount	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable		ReadCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		HistoryReadCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		WriteCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		HistoryUpdateCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		CallCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		CreateMonitoredItemsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		ModifyMonitoredItemsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		SetMonitoringModeCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		SetTriggeringCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		DeleteMonitoredItemsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		CreateSubscriptionCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		ModifySubscriptionCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		SetPublishingModeCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		PublishCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		TransferSubscriptionsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		DeleteSubscriptionsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		AddNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		AddReferencesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		DeleteNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		DeleteReferencesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		BrowseCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		BrowseNextCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		TranslateBrowsePathsToNodeIdsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		QueryFirstCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		QueryNextCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		RegisterNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable		UnregisterNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
Conformance Units
Base Info ServerType

7.15 SessionSecurityDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array instances of this type will provide a Variable of the SessionSecurityDiagnosticsType VariableType, having the SessionSecurityDiagnostics as BrowseName. Those Variables will also be referenced by the SessionDiagnostics Objects defined by their type in 6.3.5. The VariableType is formally defined in Table 83. Since this information is security related, it should not be made accessible to all users, but only to authorised users.

Table 83 – SessionSecurityDiagnosticsArrayType definition

Attribute		Value
BrowseName		SessionSecurityDiagnosticsArrayType
IsAbstract		False
ValueRank		1 (1 = OneDimension)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		SessionSecurityDiagnosticsDataType
References	NodeClass		Browse Name	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionSecurityDiagnostics	SessionSecurityDiagnosticsDataType SessionSecurityDiagnosticsType	ExposesItsArray
Conformance Units
Base Info ServerType

7.16 SessionSecurityDiagnosticsType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.12. The VariableType is formally defined in Table 84. Since this information is security-related, it shall be restricted to authorized users, such as users who have the SecurityAdmin role, defined in OPC 10000-18.

Table 84 – SessionSecurityDiagnosticsType definition

Attribute	Value
BrowseName	SessionSecurityDiagnosticsType
IsAbstract	False
ValueRank	−1 (−1 = Scalar)
DataType	SessionSecurityDiagnosticsDataType
References	NodeClass	BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasComponent	Variable	SessionId	NodeId BaseDataVariableType	Mandatory
HasComponent	Variable	ClientUserIdOfSession	String BaseDataVariableType	Mandatory
HasComponent	Variable	ClientUserIdHistory	String[] BaseDataVariableType	Mandatory
HasComponent	Variable	AuthenticationMechanism	String BaseDataVariableType	Mandatory
HasComponent	Variable	Encoding	String BaseDataVariableType	Mandatory
HasComponent	Variable	TransportProtocol	String BaseDataVariableType	Mandatory
HasComponent	Variable	SecurityMode	MessageSecurityMode BaseDataVariableType	Mandatory
HasComponent	Variable	SecurityPolicyUri	String BaseDataVariableType	Mandatory
HasComponent	Variable	ClientCertificate	ByteString BaseDataVariableType	Mandatory
Conformance Units
Base Info ServerType

7.17 OptionSetType

The OptionSetType VariableType is used to represent a bit mask. Each array element of the OptionSetValues Property contains either the human-readable representation for the corresponding bit used in the option set or an empty LocalizedText for a bit that has no specific meaning. The order of the bits of the bit mask maps to a position of the array, i.e. the first bit (least significant bit) maps to the first entry in the array, etc.

In addition to this VariableType, the DataType OptionSet can alternatively be used to represent a bit mask. As a guideline the DataType would be used when the bit mask is fixed and applies to several Variables. The VariableType would be used when the bit mask is specific for only that Variable.

The DataType of this VariableType shall be capable of representing a bit mask. It shall be either a numeric DataType representing a signed or unsigned integer, or a ByteString. For example, it can be the BitFieldMaskDataType.

The optional BitMask Property provides the bit mask in an array of Booleans. This allows subscribing to individual entries of the bit mask. The order of the bits of the bit mask points to a position of the array, i.e. the first bit points to the first entry in the array, etc. The VariableType is formally defined in Table 85.

Table 85 – OptionSetType definition

Attribute		Value
BrowseName		OptionSetType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		BaseDataType
References	NodeClass		Browse Name	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		OptionSetValues	LocalizedText[] PropertyType	Mandatory
HasProperty	Variable		BitMask	Boolean[] PropertyType	Optional
Conformance Units
Base Info OptionSet

7.18 SelectionListType

The SelectionListType VariableType is used for a Variable where the possible values are provided by a set of values.

The Selections Property contains an array of values which represent valid values for this VariableType’s value. The Selections Property may be dynamic, including changes in the length of the array. The Selections Property may also be empty indicating there are currently no valid values which can be written to the Variable. Clients should either subscribe to the Selections Property or read it just before use.

The DataType of the Selections Property array shall be of the same DataType as this VariableType. When the SelectionListType is subtyped, the DataType of the Selections Property array of the subtype shall be the same DataType as the subtype.When the SelectionListType is instantiated, the DataType of the Selections Property array of the instance shall be the same as the DataType of the instance.

Each array element of the optional SelectionDescriptions Property contains a human-readable representation of the corresponding value in the Selections Property and shall be of the same array size as the Selections Property.

The value of this VariableType may be restricted to only the values defined in the Selections Property by setting the optional RestrictToList Property to a value of True. If the RestrictToList Property is not present or has a value of False then the value is not restricted to the set defined by the Selections Property.

The VariableType is formally defined in Table 86.

Table 86 – SelectionListType definition

Attribute		Value
BrowseName		SelectionListType
IsAbstract		False
ValueRank		-1 (-1 – Scalar)
DataType		BaseDataType
References	NodeClass		Browse Name	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		Selections	BaseDataType[] PropertyType	Mandatory
HasProperty	Variable		SelectionDescriptions	LocalizedText[] PropertyType	Optional
HasProperty	Variable		RestrictToList	Boolean PropertyType	Optional
Conformance Units
Base Info Selection List

7.19 AudioVariableType

The AudioVariableType VariableType defines a Multipurpose Internet Mail Extensions (MIME) media type of the AudibleSound Property. MIME types are defined by other standards such as IETF RFC 2045, IETF RFC 2046 and IETF RFC 2047. The AudioVariableType references the Content-Type that is defined as part of the MIME type and commonly used as a reference to a specific MIME. The top-level media type is used to declare the general type of data, while the subtype specifies a specific format for that type of data. Thus, a media type of "audio /xyz" is a sufficient description for a user agent to determine the data is an audio file, even if the user agent has no knowledge of the specific audio format "xyz".

The VariableType is formally defined in Table 87.

Table 87 – AudioVariableType definition

Attribute		Value
BrowseName		AudioVariableType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		AudioDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		ListId	String	PropertyType	Optional
HasProperty	Variable		AgencyId	String	PropertyType	Optional
HasProperty	Variable		VersionId	String	PropertyType	Optional
Conformance Units
Base Info Audio Type

7.20 RationalNumberType

This complex VariableType is used for information which needs to be provided as a fraction number. It reflects the semantic of its DataType, defined in 12.22 and is formally defined in Table 88.

Table 88 – RationalNumberType Definition

Attribute		Value
BrowseName		RationalNumberType
IsAbstract		False
ValueRank		Scalar
DataType		RationalNumber
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4
HasComponent	Variable		Numerator	Int32	BaseDataVariableType	Mandatory
HasComponent	Variable		Denominator	UInt32	BaseDataVariableType	Mandatory
Conformance Units
Base Info Rational Number

Numerator and Denominator reflect the DataType RationalNumber.

7.21 VectorType

This abstract VariableType is used as base to define multi-dimensional vectors. Subtypes need to define the concrete number of dimensions. It reflects the semantic of its DataType, defined in 12.23. Subtypes shall expose the structure of their structured DataTypes as Variables. Additionally, it can define a unit for each dimension of the vector (Property VectorUnit). The VariableType is formally defined in Table 89.

Table 89 – VectorType Definition

Attribute		Value
BrowseName		VectorType
IsAbstract		True
ValueRank		Scalar
DataType		Vector
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		VectorUnit	EUInformation	PropertyType	Optional
Conformance Units
Base Info Spatial Data

VectorUnit defines the unit of each dimension of the vector. The DataType EUInformation is defined in OPC 10000-8. Note that the Property EngineeringUnits is intentionally not used, as it would have to define the engineering unit of the full vector, not its individual dimensions.

7.22 3DVectorType

This complex VariableType is used to represent a vector in 3D space. It reflects the semantic of its DataType, defined in 12.24. The VariableType is formally defined in Table 90.

Table 90 – 3DVectorType Definition

Attribute		Value
BrowseName		3DVectorType
IsAbstract		False
ValueRank		Scalar
DataType		3DVector
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the VectorType defined in 7.21
HasComponent	Variable		X	Double	BaseDataVariableType	Mandatory
HasComponent	Variable		Y	Double	BaseDataVariableType	Mandatory
HasComponent	Variable		Z	Double	BaseDataVariableType	Mandatory
Conformance Units
Base Info Spatial Data

X, Y and Z reflect the DataType 3DVector.

7.23 CartesianCoordinatesType

This abstract VariableType is used as base to define multi-dimensional coordinates. Subtypes need to define the concrete number of dimensions. It reflects the semantic of its DataType, defined in 12.25. Subtypes shall expose the structure of their structured DataTypes as Variables. Additionally, it can define a unit for the coordinates (Property LengthUnit). The VariableType is formally defined in Table 91.

Table 91 – CartesianCoordinatesType Definition

Attribute		Value
BrowseName		CartesianCoordinatesType
IsAbstract		True
ValueRank		Scalar
DataType		CartesianCoordinates
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		LengthUnit	EUInformation	PropertyType	Optional
Conformance Units
Base Info Spatial Data

LengthUnit defines the unit of each dimension of the cartesian coordinates. The DataType EUInformation is defined in OPC 10000-8. Note that the Property EngineeringUnits is intentionally not used, as it would have to define the engineering unit of the full cartesian coordinates, not its individual dimensions.

7.24 3DCartesianCoordinatesType

This complex VariableType is used for information about positions in 3D space. It reflects the semantic of its DataType, defined in 12.26. The VariableType is formally defined in Table 92.

Table 92 – 3DCartesianCoordinatesType Definition

Attribute		Value
BrowseName		3DCartesianCoordinatesType
IsAbstract		False
ValueRank		Scalar
DataType		3DCartesianCoordinates
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the CartesianCoordinatesType defined in 7.23
HasComponent	Variable		X	Double	BaseDataVariableType	Mandatory
HasComponent	Variable		Y	Double	BaseDataVariableType	Mandatory
HasComponent	Variable		Z	Double	BaseDataVariableType	Mandatory
Conformance Units
Base Info Spatial Data

X, Y and Z reflect the DataType CartesianCoordinates.

7.25 OrientationType

This abstract VariableType is used as base to define multi-dimensional orientations. Subtypes need to define the concrete number of dimensions. It reflects the semantic of its DataType, defined in 12.27. Subtypes shall expose the structure of their structured DataTypes as Variables. Additionally, it can define a unit for the orientation angles (Property AngleUnit). The VariableType is formally defined in Table 93.

Table 93 – OrientationType Definition

Attribute		Value
BrowseName		OrientationType
IsAbstract		True
ValueRank		Scalar
DataType		Orientation
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4.
HasProperty	Variable		AngleUnit	EUInformation	PropertyType	Optional
Conformance Units
Base Info Spatial Data

AngleUnit defines the unit of each dimension of the orientation. The DataType EUInformation is defined in OPC 10000-8. Note that the Property EngineeringUnits is intentionally not used, as it would have to define the engineering unit of the full cartesian coordinates, not its individual dimensions

7.26 3DOrientationType

This complex VariableType was incorrectly defined. It will be deprecated in the future and therefore should not be used. The OrientationType, defined in 7.25, is intended to be subtyped to create Types which represent any multi-dimensional orientations including 3D spaces.

The VariableType is formally defined in Table 94.

Table 94 – 3DOrientationType Definition

Attribute		Value
BrowseName		3DOrientationType
IsAbstract		False
ValueRank		Scalar
DataType		3DOrientation
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the OrientationType defined in 7.25.
HasComponent	Variable		A	Double	BaseDataVariableType	Mandatory
HasComponent	Variable		B	Double	BaseDataVariableType	Mandatory
HasComponent	Variable		C	Double	BaseDataVariableType	Mandatory
Conformance Units
Base Info Spatial Data

A, B and C reflect the DataType 3DOrientation.

7.27 FrameType

This abstract VariableType is used for information about multi-dimensional frames. It reflects the semantic of its DataType, defined in 12.29. Additionally, it provides information about the dynamic behaviour of the frame. The VariableType is formally defined in Table 95.

Table 95 – FrameType Definition

Attribute		Value
BrowseName		FrameType
IsAbstract		True
ValueRank		Scalar
DataType		Frame
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		CartesianCoordinates	CartesianCoordinates	CartesianCoordinatesType	Mandatory
HasComponent	Variable		Orientation	Orientation	OrientationType	Mandatory
HasProperty	Variable		Constant	Boolean	PropertyType	Optional
HasComponent	Variable		BaseFrame	NodeId	BaseDataVariableType	Optional
HasProperty	Variable		FixedBase	Boolean	PropertyType	Optional
Conformance Units
Base Info Spatial Data

CartesianCoordinates and Orientation reflect the DataType Frame. Note that the abstract DataType Frame does not define the fields itself, but subtypes shall create those fields.

Constant is True when the Value of the frame never changes. If the Value may change it is False.

BaseFrame is the NodeId of the frame’s base frame.

FixedBase is True when this frame is always based on the same base frame, i.e. BaseFrame never changes.

7.28 3DFrameType

This complex VariableType is used for information about frames in 3D space. It reflects the semantic of its DataType, defined in 12.30. It refines the DataTypes and VariableTypes of the CartesianCoordinates and Orientation to the corresponding 3D types. The VariableType is formally defined in Table 96.

Table 96 – 3DFrameType Definition

Attribute		Value
BrowseName		3DFrameType
IsAbstract		False
ValueRank		Scalar
DataType		3DFrame
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the FrameType defined in 7.27.
HasComponent	Variable		CartesianCoordinates	3DCartesianCoordinates	3DCartesianCoordinatesType	Mandatory
HasComponent	Variable		Orientation	3DOrientation	3DOrientationType	Mandatory
Conformance Units
Base Info Spatial Data

7.29 BitFieldType

This complex VariableType is used to represent a Variable which contains one or more fields where each field is composed of one or more bits.

Subtypes of this VariableType shall have a DataType of UInteger or one of its subtypes. Its ValueRank shall be either Scalar (-1) or a single dimensional Array (1).

Each bit field defined by the BitFieldDefinitions shall also be exposed as a child DataVariable. The BrowseName of the DataVariable shall be the same as the BitFieldDefinition name field and the NamespaceIndex of the BrowseName shall be the same as the BitFieldDefinition name field’s NamespaceIndex.

Optional bit fields may be defined by using the Optional Modeling Rule for the child DataVariable which represents the bit field. An application accessing a BitFieldType with an optional bit field should determine the presence of the optional bit field by checking the instance of that BitFieldType for the presence of the child DataVariable which represents the optional field.

The VariableType is defined in Table 97.

Table 97 – BitFieldType definition

Attribute		Value
BrowseName		BitFieldType
IsAbstract		True
ValueRank		ScalarOrOneDimension
DataType		UInteger
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4.
HasProperty	Variable		BitFieldsDefinitions	BitFieldDefinition[]	PropertyType	Mandatory
HasComponent	Variable		<FieldName>	BaseDataType	BaseVariableType	MandatoryPlaceholder
HasComponent	Variable		<OptionalFieldName>	BaseDataType	BaseVariableType	OptionalPlaceholder
Conformance Units