We now are able to connect to all remote Io cabinets, but there is still a problem.
The culprit we identified yesterday was a cabinet with a Stratix, Prosoft, and 1769 AENTR. It was cabled incorrectly, the IP address on the 1769 was wrong, and the Stratix was not configured correctly. That enabled us to get all cabinets talking on the network.
However, the last cabinet on one end of the ring has a problem when we connect it back to the main processor. When we connect, we have communication problems to all cabinets on the network. By leaving it disconnected on the end that return to the processor, we have everything working but of course that kills the benefit of having a ring.
I am leaving site and new people are coming in, so I don't know if you will see a conclusion here. If I hear anything I will post it.
Thank you everyone for your helpful contributions.