FANUC Alarm ARC-168 — SYSTEM I/O error(…, E:…)

Manufacturer wording — SYSTEM I/O error(%d)(%d, E:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC ARC-168 (“SYSTEM I/O error(…, E:…)”): I/O initialization error. First check: Confirm another I/O device and $IO_START in $RBWLD.

Updated 2026-09-17 · LogrobotLM reference

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 →