There are different system words that help the troubleshooting:
%S11: indicates a CPU watchdog overflow
%SW11: indicates the current CPU watchdog time
%S18: indicates overflow or arithmetic error
%S78: indicates a program execution error
%SW124: Last type of system fault encountered
%SW125: The code of the last fault detected
%SW126 : Blocking error instruction address
%SW127 : Blocking error instruction address
Links:
> https://www.se.com/us/en/download/document/EIO0000002135/
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