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FANUC Alarm ARC-040 — STOPL Missing I/O: %s^1 (%s^4,%d^5)

FANUC ARC-040 (“STOPL Missing I/O: %s^1 (%s^4,%d^5)”): The named weld I/O signal is not detected or configured properly . First check: Verify the I/O hardware is connected and the signal is assigned a port number in the Weld I/O screen.

Updated 2026-08-29 · LogrobotLM reference

Description

The named weld I/O signal is not detected or configured properly .

Remedy · Remède

Verify the I/O hardware is connected and the signal is assigned a port number in the Weld I/O screen. Use the CONFIG function key if the signal is unassigned.

Frequently asked · Questions fréquentes

What does FANUC alarm ARC-040 mean?
FANUC ARC-040 (“STOPL Missing I/O: %s^1 (%s^4,%d^5)”): The named weld I/O signal is not detected or configured properly .
How do you troubleshoot FANUC alarm ARC-040?
Verify the I/O hardware is connected and the signal is assigned a port number in the Weld I/O screen. Use the CONFIG function key if the signal is unassigned.

Related codes / Codes liés

ARC-038STOPL Already held another equipment (%s^4,%d^5)ARC-039STOPL %s^1 AO[%d^2] is not scaled (%s^4,%d^5)ARC-041STOPL Weld EQ needs DeviceNet optionARC-042STOPL Weld EQ needs Expl Msg option

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 →