FANUC Alarm BELL-121 — WARN Host name not recognized
FANUC BELL-121 (“WARN Host name not recognized”): Hostname currently setup on the controller for ethernet communications is not per convention for automatic Host Comm setup. First check: If standard BellTool Ethernet communications setup is desired, enter the correct 'Network Setup Number' at Setup screen at Controlled Start and press [F2] Setup to reconfigure.
Updated 2026-08-29 · LogrobotLM reference
Description
Hostname currently setup on the controller for ethernet communications is not per convention for automatic Host Comm setup.
Remedy · Remède
If standard BellTool Ethernet communications setup is desired, enter the correct 'Network Setup Number' at Setup screen at Controlled Start and press [F2] Setup to reconfigure. If you do NOT want Ethernet to be setup automatically , ignore this message and leave 'Network Setup Number' at 0.
Frequently asked · Questions fréquentes
- What does FANUC alarm BELL-121 mean?
- FANUC BELL-121 (“WARN Host name not recognized”): Hostname currently setup on the controller for ethernet communications is not per convention for automatic Host Comm setup.
- How do you troubleshoot FANUC alarm BELL-121?
- If standard BellTool Ethernet communications setup is desired, enter the correct 'Network Setup Number' at Setup screen at Controlled Start and press [F2] Setup to reconfigure. If you do NOT want Ethernet to be setup automatically , ignore this message and leave 'Network Setup Number' at 0.
Related codes / Codes liés
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →