LogrobotLM

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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 2026-09-17 · LogrobotLM reference

Description

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

Remedy

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

Related codes

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. How this reference is built →