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FANUC Alarm ARC-026 — WARN Cannot scale AIO while welding

FANUC ARC-026 (“WARN Cannot scale AIO while welding”): An analog scaling limit was modified while welding. First check: Turn off the controller and turn it on again.

Updated 2026-09-17 · LogrobotLM reference

Description

An analog scaling limit was modified while welding. The scaling was not changed.

Remedy

Turn off the controller and turn it on again.

Related codes

ARC-024WARN Invalid equipment rangeARC-025WARN Invalid A/D or D/A rangeARC-027STOPL Voltage AO is not scaledARC-028STOPL Current AO is not scaled

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 →