Mitsubishi Electric MELSEC Q Series User Manual page 144

(3) System recovery procedure
Observe the following procedures to restore the system.
1) Confirm the error-derected CPU No. and error cause with the PLC diagnostics on GX Developer.
2) Remove the error cause.
3) Either reset the CPU No.1 or restart the power to the programmable controller (power ON
All CPUs on the entire multiple CPU system will be reset and the system will be restored when CPU No.1 is reset
or the power to the CPU is reapplied.
CHAPTER3 CONCEPT FOR MULTIPLE CPU SYSTEM
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OFF ON).
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