800xA Redundant CPU failure
I'm having some problems with a redundancy setup with PM866 on a 800xA system. This is my first time working with 800xA (my previous experience has been with Freelance DCS). I didn't install this existing system either.
The current hardware setup is the following (see attached image):
- 1 AC800M PM866
- 1 CI854A
- 1 AC800M PM866
- 3 CI854A
- 1 CI873
The problem was the following:
-The operator was instructed that when they had a certain problem with a module, to unplug it and plug it again with the system running (I don't exactly know what this specific problem was).
-They have a separate system on which they did this procedure, and never caused any problem.
-When they did this on the other system, the redundant CPU went to fault and dropped all communications.
-The only way they were able to restore operations was by removing the power supply from the redundant CPU. After this, all modules were functioning properly, even the ones attached directly to the redundant.
On the software side, the following errors appeared:
-"Warning on primary unit RPA, RPB, Redundant mode enabled. Unit B acts as primary Backup CPU stopped. Switchover occurred. "
-There was also an IP error shown. It showed that the IP on the redundant CPU couldn't be found.
Right now, the system is working without redundancy. If they power up the redundant CPU, the whole system drops.
My questions are:
1. Is this a correct hardware setup for redundancy? As far as I remember, you needed the main and redundant CPUs to have the exact same hardware attached to each of them.
2. Is the action of removing a communication module while the system is running in order to "reset it" a safe procedure?
3. What could have caused this issue? Is there a way to know if the redundant CPU can be salvaged?
I haven't had the chance to do some basic comissioning and test the CPU, but I need to be ready when the user is ready to do some tests.
Thanks in advance!
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