Error Codes; Reading The Error Code - Mitsubishi Electric MELSEC-Q Series User Manual

6. ERROR CODES

If a fault occurs at the start or during RUN of the programmable
controller, the self-diagnostics function gives an error indication or
stores an error code (including the step number) in the special register.
6.1

Reading the Error Code

If an error occurs, its code, message and others can be read with a
peripheral device.
For details of how to operate the peripheral device, refer to the
operating manual of your peripheral device.
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