What does FANUC alarm GUID-252 mean?

FANUC GUID-252 (“WARN Invalid I/O Port setting.”): Invalid I/O Port setting. Cannot access to the specified I/O port.

FANUC Alarm GUID-252 — WARN Invalid I/O Port setting.

FANUC GUID-252 (“WARN Invalid I/O Port setting.”): Invalid I/O Port setting. First check: Please use the I/O menu to check the port setting.

Updated 2026-08-29 · LogrobotLM reference

Description

Invalid I/O Port setting. Cannot access to the specified I/O port.

Remedy · Remède

Please use the I/O menu to check the port setting.

Frequently asked · Questions fréquentes

What does FANUC alarm GUID-252 mean?: FANUC GUID-252 (“WARN Invalid I/O Port setting.”): Invalid I/O Port setting. Cannot access to the specified I/O port.
How do you troubleshoot FANUC alarm GUID-252?: Please use the I/O menu to check the port setting.

Related codes / Codes liés

GUID-250WARN Software loading error.GUID-251WARN Invalid data range.GUID-253WARN Invalid system variable.GUID-254WARN Invalid torque setup.

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 →