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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

F105Initial Status with Baton/Data Link IssueF106Control/Sub-control Station Shift StatusF107Baton Pass Error (Baton Lost)
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H
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