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ErrorLib — Industrial Fault Code Library

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1400H

Double Input Discrepancy Detection Error

Mitsubishi Electric · MELSEC iQ-R I/O Module

What does 1400H mean?

A discrepancy has been detected in a double input configuration, meaning the expected redundancy check has failed. This typically points to an issue with the physical wiring, the connected input devices, or an unused input terminal that has not been correctly configured.

Common Causes

  • Discrepancy detected between redundant double inputs due to wiring faults or device malfunction.
  • An unused input terminal configured for double input is not set to 'Not used' in 'Wiring input selection'.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    For any unused input terminals, set 'Wiring input selection' to 'Not used'.

  2. 2

    Check for the specific input terminal with the error using Double input discrepancy detection state (Un\G1036).

  3. 3

    Review and adjust the connected devices and wiring for the identified problematic input terminal.

Browse all codes in this manual (56)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric MELSEC iQ-R I/O Module
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