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 2.
Table 2 – StateVariableType definition
|
Attribute |
Value |
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|
BrowseName |
StateVariableType |
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|
DataType |
LocalizedText |
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|
ValueRank |
−1 (−1 = Scalar) |
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|
IsAbstract |
False |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
|
|
Subtype of the BaseDataVariableType defined in OPC 10000-5 Note that a Reference to this subtype is not shown in the definition of the BaseDataVariableType. |
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|
HasSubtype |
VariableType |
FiniteStateVariableType |
Defined in 4.4.6 |
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|
HasProperty |
Variable |
Id |
BaseDataType |
PropertyType |
Mandatory |
|
|
HasProperty |
Variable |
Name |
QualifiedName |
PropertyType |
Optional |
|
|
HasProperty |
Variable |
Number |
UInt32 |
PropertyType |
Optional |
|
|
HasProperty |
Variable |
EffectiveDisplayName |
LocalizedText |
PropertyType |
Optional |
|
|
Conformance Units |
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|
Base Info State Machine Instance |
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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.