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. 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. 2

    Inspect network cables for physical damage, loose connections, or incorrect wiring

  3. 3

    Check for sources of electrical noise

  4. 4

    Verify that station numbers and remote master station settings are not duplicated

  5. 5

    Examine network hardware for faults

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Verified technical data. Last updated: March 2026

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Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H