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FANUC Alarm SPOT-355 — WARN Invalid IWC function code

FANUC SPOT-355 (“WARN Invalid IWC function code”): Invalid IWC function code The function request to the IWC driver is invalid. First check: This is a system programming error.

Updated 2026-09-17 · LogrobotLM reference

Description

Invalid IWC function code The function request to the IWC driver is invalid.

Remedy

This is a system programming error.

Related codes

SPOT-353WARN IWC message in progressSPOT-354WARN Invalid IWC msg buffersSPOT-356WARN Checksum error, IWC msg sendSPOT-357WARN Invalid buffer, IWC msg send

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 →