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FANUC Alarm IBSS-503 — Welding I/O needs Arc Tool

FANUC IBSS-503 (“Welding I/O needs Arc Tool”): System internal error First check: Document the events that led to the error, and call your FANUC or FANUC Robotics technical service representative.

Updated 2026-09-17 · LogrobotLM reference

Description

System internal error

Remedy

Document the events that led to the error, and call your FANUC or FANUC Robotics technical service representative.

Related codes

IBSS-501Welding I/O setting is invalidIBSS-502AI/AO needs analog I/O optionIBSS-504Restore Alternative manuallyIBSS-505Loading IBPXC.SV (need 1 minute)

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 →