How to interpret PM861 Controller log

We have experienced that a PM861 Controller seemingly without external influence has stalled and erased its application program. We have seen this happen twice since November last year. The CPU is close to 10 years old and we are using Control Builder version I have attached the log file and would very much appreciate some help in interpreting this log file. I think the log file indicates that there may be a hardware fault, since it lists a Memory parity error, but the last incident this week also indicates that a Profibus module was Hot swapped which it clearly was not. No one touched the PLC when it happened. Since a PM861 is a costly item we are reluctant to replace unless we are reasonably sure it will fix the problem.


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asked 10 months ago



Memory Parity Error indicates most probably the hardware issue. So replacing the controller is solution. However to be sure send the log file to ABB Support and someone will be able to confirm.


answered 10 months ago


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I assume that you mean "Hot swapped" is shown in the log as "Hot removal of CEX module at position 1 detected". I don't see that anywhere else in the log and if this issue has happened twice since November, I would expect to see the same message prior to the CPU stopping. I would lean more towards an issue in the CPU. According to document 3BSE040269, this CPU model number PM861K01 is near the end of the limited phase which is short of being in the obsolete phase. I know that v5.0 entered into the limited phase as well. You may want to consider an upgrade to hardware and software in the Active lifecycle phase.

Just as an FYI.. We had a CPU that failed and would not allow us to even connect to it. We had no choice but to replace it. If you do decide to replace the CPU, make sure to write down values such as internal PID setpoints or any value that may have changed from its intial value. When we pressed the Init button, the CPU reverted back to the initial value. The internal PID setpoints reverted back to 0 and we had some issues starting up the line again. Best of luck!


answered 10 months ago


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