F11B
Station Disconnected (Remote I/O)
Mitsubishi Electric · MELSEC Q-series MELSECNET/H
What does F11B mean?
The station is reporting a disconnected status, indicating a loss of communication. This can be due to incorrect parameter settings, faulty hardware, or network cabling issues, especially in a remote I/O setup.
Common Causes
- Parameter error or incorrect switch settings for the corresponding remote master station
- Faulty cables or incorrect cable wirings
- Faulty hardware
- Electrical noise
- Duplicate station numbers or duplicate remote master stations
Repair Steps & Checklist
Click steps to track your progress.
- 1
Review all parameter and switch settings for the affected station, ensuring they are correct and the station is properly configured as a remote master station
- 2
Inspect network cables for physical damage, loose connections, or incorrect wiring
- 3
Check for sources of electrical noise
- 4
Verify that station numbers and remote master station settings are not duplicated
- 5
Examine network hardware for faults
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H