EL
ErrorLib
Brands
||
  1. Home
  2. Mitsubishi Electric
  3. MELSEC Q-series MELSECNET/H
  4. F709
About·Privacy·Terms

ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

F105Initial Status with Baton/Data Link IssueF106Control/Sub-control Station Shift StatusF107Baton Pass Error (Baton Lost)
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H
Open Manual (Page 165)Search more codes in this manual