1000H

Power Shutoff

Mitsubishi Electric · MELSEC iQ-R I/O Module

What does 1000H mean?

This error code indicates that a momentary power failure has occurred in the remote head module. If the transmission interval monitoring time for the master station or the I/O module with diagnostic functions is set too low, safety communications may stop as a result of such power fluctuations.

Common Causes

  • Momentary power failure in the remote head module.
  • Value of 'Transmission interval monitoring time' for the master station is smaller than required for momentary power failure precautions.
  • Value of 'Transmission interval monitoring time' for the I/O module with diagnostic functions is smaller than required for momentary power failure precautions.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Implement appropriate measures against momentary power failure (Refer to MELSEC iQ-R Module Configuration Manual).

  2. 2

    Check 'Transmission interval monitoring time' of the I/O module with diagnostic functions (Refer to Page 185 Basic Settings).

  3. 3

    Check 'Sending Interval Monitoring Time' of the master station (Refer to MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)).

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Verified technical data. Last updated: March 2026

Related Faults

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