F709

Receiving Network Number Error

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F709 mean?

The received network number is invalid, causing a communication error. This often points to incorrect network number parameters or a mismatch with other stations' configurations.

Common Causes

  • The received network number is invalid
  • Incorrect network number configured in parameters
  • Mismatch with the default network No. 1 if parameters are not set

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review the network No. specified in the parameters of the receiving station

  2. 2

    If parameters are not explicitly set, confirm that other stations are configured for network No. 1 (default)

  3. 3

    Ensure all stations intended for communication share the same valid network number

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Verified technical data. Last updated: March 2026

Related Faults

Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H