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
Review the network No. specified in the parameters of the receiving station
- 2
If parameters are not explicitly set, confirm that other stations are configured for network No. 1 (default)
- 3
Ensure all stations intended for communication share the same valid network number
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H