Errata exists for this version of the document.

The StateVariableType is the base VariableType for Variables that store the current state of a StateMachine as a human readable name.

The StateVariableType is formally defined in Table B.2.

Table B.2 – StateVariableType Definition

Attribute		Value
BrowseName		StateVariableType
DataType		LocalizedText
ValueRank		−1 (−1 = Scalar)
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4. Note that a Reference to this subtype is not shown in the definition of the BaseDataVariableType.
HasSubtype	VariableType		FiniteStateVariableType	Defined in B.4.6
HasProperty	Variable		Id	BaseDataType	PropertyType	Mandatory
HasProperty	Variable		Name	QualifiedName	PropertyType	Optional
HasProperty	Variable		Number	UInt32	PropertyType	Optional
HasProperty	Variable		EffectiveDisplayName	LocalizedText	PropertyType	Optional

Id is a name which uniquely identifies the current state within the StateMachineType. A subtype may restrict the DataType.

Name is a QualifiedName which uniquely identifies the current state within the StateMachineType.

Number is an integer which uniquely identifies the current state within the StateMachineType.

EffectiveDisplayName contains a human readable name for the current state of the state machine after taking the state of any SubStateMachines in account. There is no rule specified for which state or sub-state should be used. It is up to the Server and will depend on the semantics of the StateMachineType.

StateMachines produce Events which may include the current state of a StateMachine. In that case Servers shall provide all the optional Properties of the StateVariableType in the Event, even if they are not provided on the instances in the AddressSpace.