F11A

Send Failure (Multiplex Loop Transmission Stopped)

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F11A mean?

A send failure occurred because multiplex loop transmission has stopped. This indicates a problem within the loop network that is preventing data from being sent.

Common Causes

  • Interruption or stoppage of multiplex loop transmission
  • Underlying network communication issues

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Attempt to retry the send operation after a short interval

  2. 2

    If the error persists, investigate the multiplex loop network status for underlying faults

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Verified technical data. Last updated: March 2026

Related Faults

Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H