I’m trying to understand the relationship between UaVariableNode and tags when the tag’s data type is changed in the designer. Does the client based on the tag data type convert the incoming data locally or is that specifying the expected data type coming from the server?
Changing the DataType of a tag just causes the value to be coerced in Ignition’s tag system. It does not change the type in the OPC server nor does it to tell the server what DataType is expected (this isn’t a concept that exists in OPC; the server dictates the DataType of a VariableNode).