10/13/2021
Hi everyone. I have a couple of question for OPC UA experts:
1) Do you know or is there a document/resource which describes how specifications are named? E.g. OPC UA specs are named 10000-X with X<100 for certain specs and X>100 certain companion specs. What is the rationale there?
2) I understand OPC UA specification versioning for UA specs named 10000-X with X<100 evolves as follows: …, 1.03, 1.04, 1.05.01, 1.05.02,…. Can an OPC UA stack of version Y work with the Base Information Models (i.e. Opc.Ua.NodeSet2.xml available from the OPC Foundation) of version Z? I suppose there shouldn’t be problem when Y>=Z, but I am unclear on the other way around.
Hopefully you can help me with some pointers/help.
Thanks!
05/30/2017
1) The numbering for CS is based on classification. See the left panel here:
https://opcfoundation.org/deve…..documents/
2) Specs are generally forward and backward compatible. i.e. a 1.05 can work with all versions <1.05 because changes are additive and all applications are expected to handle extensions to an information model that they had not seen before.
05/30/2017
If a Server instantiates a ObjectType it can add additional nodes to the instance as it sees fit.
i.e. it is legal create an Object with B/C/Y components from ObjectType that only defines the B/C components.
Every client is expected to be able to deal with extra stuff it does not understand (i.e. ignore extra stuff without errors).
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