Processor or System Errors
Original instructions
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General
Processor or system errors are serious errors related either to the processor (equipment or software) or to the rack bus wiring. The system can no longer operate correctly when these errors occur. They cause the PLC to stop in ERROR status, which requires a cold restart. The next cold restart will be forced in STOP status to prevent the PLC from returning to error.
Diagnosis of Processor and System Errors
The following table presents the diagnosis of processor and system errors.
RUN Status LED
ERR Status LED
I/O Status LED
Hexadecimal Value of the System Word %SW124
Error
-
ON
ON
80
System watchdog error or rack bus wiring error
-
ON
ON
81
Rack bus wiring error
-
ON
ON
90
Unforeseen interruption.
System task pile overrun.
Legend:
ON: On
-: Undetermined