LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm ARC-120 — Enable/Disable Sim mode failed

FANUC ARC-120 (“Enable/Disable Sim mode failed”): The necessary signals for Simulation mode cannot be detected. First check: Verify that AI/O and WDI/O signals are assigned appropriately.

Updated 2026-08-29 · LogrobotLM reference

Description

The necessary signals for Simulation mode cannot be detected.

Remedy · Remède

Verify that AI/O and WDI/O signals are assigned appropriately.

Frequently asked · Questions fréquentes

What does FANUC alarm ARC-120 mean?
FANUC ARC-120 (“Enable/Disable Sim mode failed”): The necessary signals for Simulation mode cannot be detected.
How do you troubleshoot FANUC alarm ARC-120?
Verify that AI/O and WDI/O signals are assigned appropriately.

Related codes / Codes liés

ARC-106WARN Config of Roboweld is invalidARC-107STOPL Roboweld internal Error(%d)ARC-121Weld not performed(Sim mode)ARC-122Cannot SIM/UNSIM(%s,Id:%d)

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 →