CI867 Redundancy problem
We have redundant CI867 cards to have redundant Modbus TCP/IP communication with Emerson DeltaV DCS. Let me briefly tell you the connection details;
- CI867 cards are configured as redundant.
- There are two switches in ABB cabinet. CI867 cards are connected to these switches.
- After the switches, we have fiber-ethernet convertors to connect to remotly placed DeltaV modbus switches.
The problem is that, if a cable break occurs after the ABB switches, e.g., between ABB switch and fiber-ethernet convertor, or between fiber-ethernet convertors, or fiber-ethernet convertor and DeltaV modbus switches, it is not detected by CI867 cards and switcover does not happens.
What can be done in this case?
Is it possible to configure redundant CI867 cards as single to make them active all the time? Then DeltaV can poll them at the same time, if one does not respond, the other one can.
Thanks for your help
So if you unplug the CI867 from the switch them the failure is detected correctly? It sounds like the link is polling for an ethernet connection active and geting an answer from the switch that everything is OK even though the link is down.
I suspect the answer is in a configuration setting of the switch to prevent it responding at all. if this is just a point to point link, your other option might be to just remove the switches altogether and use a crossover ethernet cable straight to the fibre convertors