1106

RAM ERROR

Mitsubishi Electric · MELSEC System Q/L Series

What does 1106 mean?

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.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the battery to see if it is dead or not. If dead, replace the battery.

  2. 2

    Take noise reduction measures.

  3. 3

    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.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Mitsubishi Electric MELSEC System Q/L Series