screens/variables won't update

screens/variables won't update

Hi,

I am facing an issue with my zenon 7.5 installation.
Screens and variables in my project don't get updated in the runtime/operator view.

It seems like zenon is not communicating with PLC. The zenon operator/runtime screen keeps displaying last read values and not the current value.
Please suggest how to diagnose the issue.

I'm using Zenon 7.5 (for SCADA/HMI), CodeSys (for logic) and ABB AC500 PLC

This is a migrated post! Originally posted on 22.04.2020 by user ashish811. Please be aware that information can be outdated.