Controller
HMI Panel
Cable
Net Interface Module on I/O.
The only thing we didn't replace was the power supply. The panel was using 100% of P.S. capacity. We reduced the load to 1 module, and still won't communicate.
Magically it started up, got alot of I/O checked out, VFD's run up and down. Then it stopped again.
We have new Power Supply coming tomorrow. Maybe that will work?
-- Update
Power Supply didn't change anything.
Finally we changed Communcation to a Ethernet Comm head.
Now everything works just fine. There must have been a problem with the comm module.
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