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FANUC Alarm IBSS-500 — Analog I/O setting is invalid

FANUC IBSS-500 (“Analog I/O setting is invalid”): 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-497Failed to change len/ofsIBSS-498len/ofs must be multiple of 16IBSS-501Welding I/O setting is invalidIBSS-502AI/AO needs analog I/O option

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 →