I’m just starting to convert from RSLinx to OPC-UA. I have run into two issues (at the moment) that have me beating my head against the wall:
I cannot access controller scope tags in a ControlLogix PLC. I can browse to all of the PROGRAM scope tags, but not find any CONTROLLER scope tags. Since the syntax is slightly different than RSLinx (Program scope tags don’t use the [Topic]Program:ProgramName.TagName syntax, but instead use [Device]ProgramName.Tagname), I do not know how to manually reference a controller scope tag for testing.
I cannot build a path to a remote ControlLogix PLC (although I can bridge connections to get to a PLC5 or SLC). It looks like the ControlLogix driver for OPC-UA requires a mill-wide Ethernet card in the PLC local rack. I need to be able to bridge through a rack
I’ll take any help I can get… without these two issues resolved, I think I’m dead in the water with this OPC server.