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

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

Updated 2026-08-29 · LogrobotLM reference

Description

I/O initialization error.

Remedy · Remède

Confirm another I/O device and $IO_START in $RBWLD.

Frequently asked · Questions fréquentes

What does FANUC alarm ARC-168 mean?: FANUC ARC-168 (“SYSTEM I/O error(%d)(%d, E:%d)”): I/O initialization error.
How do you troubleshoot FANUC alarm ARC-168?: Confirm another I/O device and $IO_START in $RBWLD.

Related codes / Codes liés

ARC-166STOP Comm . stopped in weld(E:%d)ARC-167SYSTEM I/O asginment overlap(%d)(E:%d)ARC-169STOP Invalid wire op.(E:%d)ARC-170STOP Detect Arc OFF(E:%d)

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →