8 Standard DataTypes ToC Previous Next

8.7 BaseDataType ToC Previous Next

This abstract DataType defines a value that can have any valid DataType.

It defines a special value null indicating that a value is not present. This abstract DataType does not have an encoding defined in OPC 10000-6. Any direct subtype shall only be defined in NameSpaceIndex 0.

A BaseDataType is an abstract DataType which represents any possible value including arrays of values. When an array of BaseDataTypes is specified each element of the array can be a scalar or array of any DataType.

When a BaseDataType is used in conjunction with a ValueRank then the ValueRank specifies whether there is an array of BaseDataType values. The ValueRank does not restrict the content of each element.

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