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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.

1112

TRK. CIR. ERROR

Mitsubishi Electric · MELSEC System Q/L Series

What does 1112 mean?

A tracking hardware fault was detected during running in the redundant system. This indicates an issue with the hardware responsible for tracking system status, potentially compromising redundancy.

Common Causes

  • The tracking cable was disconnected and reinserted without the standby system being powered off or reset.
  • The tracking cable is not secured by the connector fixing screws.
  • The error occurred at a startup since the redundant system startup procedure was not followed.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Start after checking that the tracking cable is connected. If the same error is displayed again, the cause is the hardware fault of the tracking cable or CPU module.

  2. 2

    Confirm the redundant system startup procedure, and execute a startup again.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

Related Faults

1000CPU Down Error1001CPU Down Error with Device Access Issue1002CPU Down Error
Source: Mitsubishi Electric MELSEC System Q/L Series
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