The BooleanGuardVariableType is a subtype of the GuardVariableType. It is used to provide the conditions to trigger a transition in a state machine. Each Condition component is necessary. When all the Condition components are True, the transition is triggered (sufficient).
BooleanGuardVariableType is formally defined in the following table.
Table 191 – BooleanGuardVariableType Definition
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Attribute |
Value |
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|
BrowseName |
BooleanGuardVariableType |
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|
IsAbstract |
False |
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|
ValueRank |
−1 (−1 = Scalar) |
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|
DataType |
0:LocalizedText |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
Other |
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|
Subtype of the GuardVariableType defined in OPC 10000-16, which means it inherits the Instance Declarations of that Node. |
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|
0:HasProperty |
Variable |
<Condition> |
0:Boolean |
0:PropertyType |
MP, RW |
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The components of the BooleanGuardVariableType are further described below.
|
BrowseName |
Description |
|
Condition |
A condition that is necessary to trigger a transition in a state machine. The description is the human-readable identification of the value of the Condition. The browse name is the human-readable identification subject to naming conventions and browse name limitations. |