90  H

Number of output ON times alarm detection count reached

Mitsubishi Electric · MELSEC iQ-R I/O Module

What does 90  H mean?

The number of output ON times has reached the pre-configured alarm detection count. This alarm indicates that a specific output has been activated a set number of times, potentially signaling that a connected actuator or contactor is nearing its operational lifespan or a process requires monitoring.

Common Causes

  • Output ON times count reached the alarm detection count threshold configured for monitoring output activations.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Set the corresponding bit of 'Number of output ON times value clear request' to 1 (Requested) to clear the accumulated number of output ON times.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Mitsubishi Electric MELSEC iQ-R I/O Module
Mitsubishi Electric Error 90  H: Number of output ON times alarm detection count reached — Troubleshooting Guide | ErrorLib