1101

RAM Error - Sequence Program Memory

Mitsubishi Electric · MELSEC System Q/L Series

What does 1101 mean?

The sequence program storing program memory within the CPU module is faulty. This diagnostic occurs during power ON, after a reset, or upon execution of an END instruction, indicating an issue with program integrity.

Common Causes

  • Faulty sequence program storing program memory in the CPU module.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Implement noise reduction measures for the control system environment.

  2. 2

    Reset the CPU module and attempt to RUN it again.

  3. 3

    If the same error is displayed again after resetting, diagnose for 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