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
Implement noise reduction measures for the control system environment.
- 2
Reset the CPU module and attempt to RUN it again.
- 3
If the same error is displayed again after resetting, diagnose for a CPU module hardware fault.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC System Q/L Series