LogrobotLM

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FANUC Alarm ARC-122 — Cannot SIM/UNSIM

Manufacturer wording — Cannot SIM/UNSIM(%s,Id:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC ARC-122 (“Cannot SIM/UNSIM”): I/O signals were not set to sim/unsim appropriately when Simulation mode was enabled/disabled. First check: Verify that the AI/O and WDI/O signals are assigned appropriately.

Updated 2026-09-17 · LogrobotLM reference

Description

I/O signals were not set to sim/unsim appropriately when Simulation mode was enabled/disabled.

Remedy

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

Related codes

ARC-120Enable/Disable Sim mode failedARC-121Weld not performed(Sim mode)ARC-123Memory size is too smallARC-124

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. How this reference is built →