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How to handle OptionSetType with DataType not numerical

Martin Lang

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12/03/2020 - 08:41

The OPC UA Spec. Part 5 defines the VariableType OptionSetType with DataType BaseDataType.
Is this intentionally? Imho only Numeric and its subtype would make sense.
How should Variables with for instance DataType LocalizedText and TypeDefintion OptionSetType work?

tia + br
Martin

Randy Armstrong

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12/03/2020 - 20:31

The DataType of this VariableType shall be capable of representing a bit mask. It shall be either a numeric DataType representing a signed or unsigned integer, or a ByteString. For example, it can be the BitFieldMaskDataType.

https://reference.opcfoundatio.....art5/7.17/

Martin Lang

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12/04/2020 - 02:52

Ok, but why is in Table 76 -> DataType the BaseDataType specified and NOT numeric?

Randy Armstrong

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12/04/2020 - 08:56

The only common super-type of ByteString and Number is BaseDataType.

Only one DataType can be specified in the model so it has to be BaseDataType.

Martin Lang

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12/07/2020 - 01:06

Thank you for clarification! I overlooked the ByteStrings.

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