Automation Professionals' Advanced Modbus Driver

[pturmel]

Automation Professionals is pleased to announce a new production release of the Advanced Modbus Module.

For Ignition v8.1.x: v1.1.8.242731956

This release fixes a client driver bug in holding register Masked Write operations, as reported by @woodsb02 over here, long ago:

Ignition OPC UA Server Redundancy (Modbus TCP)

Actually, I think I may have found a bug when used with bit-level addressing and Modbus mask-write. Not sure if its new with this redundant BETA version or pre-existing. My test setup (both the modbus server and client are using your advanced modbus driver): Modbus Server listening on 0.0.0.0 Modbus Advanced Client connecting to 127.0.0.1 and 127.0.0.2 Setup a boolean OPC tag which uses the Modbus advanced client device. Using this address works: ns=1;s=[client]1.C1 Using this address work…

I couldn't reproduce with the designer tag browser or with fire-and-forget writes, because the actual write worked. The breakthrough came when I scripted my testing with system.opc.writeValue(). Boom!

This bug goes all the way back to the beta. All users should upgrade.

Sigh.