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Custom DataType Identifiers
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Michael Daspersgruber
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01/23/2024 - 04:45
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Hi,

Is there a definition/specification for DataType Identifiers outside the standard data types (namespace index = 0)? We are working with a B&R PLC where we create custom enums, such as 'eRoles' (User, Supervisor, Admin). In this case, the Identifier for this data type is 170 (namespace index = 6). Complex data types, for example, have the identifier 100160. Are these value ranges specified anywhere? The goal is to infer the data type based on the Identifier on the client side.

Thanks in advance.

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Randy Armstrong
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01/26/2024 - 01:04
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In OPC UA NodeIds are always scoped by the NamespaceUri and the meaning of Ids with that scope are defined by the authority that defined the NamespaceUris.

NamespaceUri authorities may be companion specifications, vendors or individual servers.

The index 6 references to an index in the NamespaceArray that contains the NamespaceUri.

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Michael Daspersgruber
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01/28/2024 - 22:58
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Thanks for your answer!

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