FANUC Alarm ARC-211 — WARN Arclink ch… comm error …
Manufacturer wording — WARN Arclink ch%d comm error %d
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC ARC-211 (“WARN Arclink ch… comm error …”): An unexpected communications error has occurred on the Arclink CAN interface. First check: Check all Arclink connections and wiring, then turn off the controller, and restart it.
Updated 2026-09-17 · LogrobotLM reference
Description
An unexpected communications error has occurred on the Arclink CAN interface.
Remedy
Check all Arclink connections and wiring, then turn off the controller, and restart it.
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 →