OPC UA method calls

jebu — Wed, 23 Sep 2026 10:26:04 -0000

I'm setting up an OPC UA server in CODESYS. My understanding so far:

Calling methods over OPC UA requires an Information Model — the plain Symbol Set / Symbol Configuration alone doesn't support method calls. Is that correct, or is there a way around it?
With an Information Model, the Node IDs are auto-generated and I can't set them manually. Assuming that's right:
-Are these generated Node IDs stable across builds/downloads, or can they change?
-If they can change, what triggers it — renaming a variable/method, reordering objects in the model, a rebuild, a re-download to the PLC?

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