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FANUC Alarm SPOT-356 — WARN Checksum error, IWC msg send

FANUC SPOT-356 (“WARN Checksum error, IWC msg send”): Checksum error, IWC msg send The IWC reported a checksum error during a message send operation. First check: Notify Product Development.

Updated 2026-09-17 · LogrobotLM reference

Description

Checksum error, IWC msg send The IWC reported a checksum error during a message send operation. This may indicate a problem with the board or driver software.

Remedy

Notify Product Development.

Related codes

SPOT-354WARN Invalid IWC msg buffersSPOT-355WARN Invalid IWC function codeSPOT-357WARN Invalid buffer, IWC msg sendSPOT-358WARN Checksum error, IWC msg recv

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 →