F7C9

Resend Count Out of Range

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F7C9 mean?

The configured resend count for communication attempts is outside its permissible setting range. This prevents proper retry logic for failed transmissions.

Common Causes

  • Resend count is set to a value outside the valid range of 0 to 15 times

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Set the resend count parameter to a value within the range of 0 to 15 times

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Verified technical data. Last updated: March 2026

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Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H