FANUC Alarm ARC-018 — STOPL Lost arc detect
Manufacturer wording — STOPL Lost arc detect (%s^4,%d^5)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC ARC-018 (“STOPL Lost arc detect”): The arc detect signal was lost during a weld. First check: Check if weld controler is functioning correctly, or powered on.
Updated 2026-09-17 · LogrobotLM reference
Description
The arc detect signal was lost during a weld.
Remedy
Check if weld controler is functioning correctly, or powered on.
Related codes
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 →