This chapter describes various potential errors that occur while operating the system,
causes of errors, ways to detect them, and corrective measures.
Basic troubleshooting procedure
If there is any problem in the system, identifying the cause for the problem and taking
immediate corrective actions would improve the reliability of the system. To
troubleshoot the system, ensure that the cautions and procedures given below are
Check the following manually.
Operation status (Stop and Run).
Power ON/OFF status.
I/O device status.
Wiring status (I/O wiring, extension, and communication cable).
The status of each displays (RUN, ERR, P-RUN, STATUS LED, I/O LED, and
so on), connection to peripherals, and verify the operation condition.
Check for any abnormality.
Observe how an error can be detected:
Move the key switch to STOP and turn it ON/OFF.
Identify the reason for the fault.
Is it from the PLC or external factor?
I/O module or others?
Pnet I/F Module 2MLL-PSRA, 2MLL-PSEA User's Guide