For all VariableTypes specified in this specification, the Attributes named in Table 6 shall be set as specified in the table. The definitions for the Attributes can be found in OPC 10000-3.
Table 6 – Common VariableType Attributes
|
Attributes |
Value |
|
Value |
Optionally a vendor-specific default value can be provided |
|
ArrayDimensions |
If the ValueRank does not identify an array of a specific dimension (i.e. ValueRank <= 0) the ArrayDimensions can either be set to null or the Attribute is missing. This behaviour is vendor-specific. If the ValueRank specifies an array of a specific dimension (i.e. ValueRank > 0) then the ArrayDimensions Attribute shall be specified in the table defining the VariableType. The concrete array length is contained in the delivered Value. Therefore this information is only relevant for write access to the VariableType Value if the array has a fixed length. |