Mitsubishi Electric · MELSEC System Q/L Series
The program memory in the CPU module is faulty. This error is detected during a STOP to RUN transition or when an END instruction is executed, indicating an issue with the stored program logic.
Click steps to track your progress.
Check the battery to see if it is dead or not. If dead, replace the battery.
Take noise reduction measures.
Format the program memory, write all files to the PLC, then reset the CPU module and RUN it again. If the same error is displayed again, this suggests a CPU module hardware fault.