Annex B (normative) StateMachines ToC Previous Next

B.4 Representation of state machines in the AddressSpace ToC Previous Next

B.4.3 StateVariableType ToC Previous Next index

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 Node Class BrowseName DataType TypeDefinition Modelling Rule
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.

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