Hi Kevin
You have wrote that you have tested the OPC UA server built in Siemens 1500 PLC.( TIA v 14)
I’m testing now the communication with Ignition v 7.9.0 and I have strange behaviours.
If I read a tag with the a scanclasses definited as type OPC DATA MODE= Read, Ignition is able to read the value and every change.
But If I set the scanclass as type OPC DATA MODE= subscribed ignition does not reads the change of values
best