FANUC Alarm ARC-209 — WARN Arclink ch… bus errors
Manufacturer wording — WARN Arclink ch%d bus errors
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC ARC-209 (“WARN Arclink ch… bus errors”): The Arclink interface is detecting unexpected errors on the network, indicating possible electrical noise or other interference. First check: Check all Arclink connections and wiring to eliminate the source of the noise.
Updated 2026-09-17 · LogrobotLM reference
Description
The Arclink interface is detecting unexpected errors on the network, indicating possible electrical noise or other interference. If these errors continue, a network failure could occur.
Remedy
Check all Arclink connections and wiring to eliminate the source of the noise.
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 →