F122
Send Failure (Coaxial Bus Network)
Mitsubishi Electric · MELSEC Q-series MELSECNET/H
What does F122 mean?
A send failure has occurred specifically in a bus-based coaxial cable network. This points to issues with the coaxial cable integrity, connections, or terminating resistors.
Common Causes
- Faulty coaxial cable connection or unstable coaxial cable connection
- Absence or incorrect connection of terminating resistors
- General cable faults in the coaxial infrastructure
Repair Steps & Checklist
Click steps to track your progress.
- 1
Inspect all coaxial cable connections for tightness and proper seating
- 2
Verify the stability and integrity of the coaxial cable itself, checking for damage
- 3
Confirm the presence and correct connection of all terminating resistors on the coaxial bus
- 4
Check for any other general faults in the coaxial cable infrastructure
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H