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Posted: 2024-09-1003:21 AM
Citect and remote Modbus device
Hi all,
I have an issue which is frustrating me no end, and I am sure its something simple I have missed.
We have Vijeo Citect 7.4, and I am trying to incorporate some of our remote sites into it. We have a pump controlled by a Unitronics V200, that is causing me grief. It is a remote site, and behind a Comset M2M router. It has ports 502 and 20256 forwarded to the PLC.
I can connect to the PLC over the internet using Modscan, and I can poll it and see the values I want to display. I have the Unitronics app on my phone and I can turn the pump on and off remotely. So, I am confident that it’s not a network issue.
My problem is when I try and configure it in Citect.
I used the express communication wizard to create the IO device (External I/O -> Modbus TCP, then created a Variable tag, and then put that tag on a display, everything compiles fine.
I am constantly getting #COM (Bad) error. I have been pouring over the documentation, tutorials and guides I can find and I am sure I have configured it correctly, but equally sure I a made an error somewhere
Can anyone offer any insight to where I might have gone wrong?