System Error - Abnormal OS Argument Data
Mitsubishi Electric · MELSEC System Q/L Series
What does 4186H mean?
An abnormality was detected in the argument data within the Operating System (OS). This indicates a system error that could stem from improper installation of hardware, an unsuitable operating environment, insufficient power supply, or a hardware failure of the CPU module itself.
Common Causes
- Power supply module or CPU module not properly installed to the base unit.
- Operating environment for the system does not satisfy the general specifications of the CPU module.
- Insufficient power capacity.
- Hardware failure of the CPU module.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check whether the power supply module and the CPU module are properly installed to the base unit.
- 2
Verify that the operating environment for the system satisfies the general specifications of the CPU module.
- 3
Check whether the power capacity is sufficient for all connected components.
- 4
Reset the CPU module.
- 5
If the same error code is displayed again, diagnose for a hardware failure of the CPU module.