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 87.
Table 87 – VectorType Definition
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Attribute |
Value |
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|
BrowseName |
VectorType |
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|
IsAbstract |
True |
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|
ValueRank |
Scalar |
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|
DataType |
Vector |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
Modelling Rule |
|
|
Subtype of the BaseDataVariableType defined in 7.4 |
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|
HasProperty |
Variable |
VectorUnit |
EUInformation |
PropertyType |
Optional |
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|
Conformance Units |
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|
Base Info Spatial Data |
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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.