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
Check the battery to see if it is dead or not. If dead, replace the battery.
- 2
Take noise reduction measures.
- 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.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC System Q/L Series