LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm PALL-021 — IO_STATUS error occurred

FANUC PALL-021 (“IO_STATUS error occurred”): An I/O error occurred during the data transfer. First check: Cold start the controller, and retry the operation.

Updated 2026-08-29 · LogrobotLM reference

Description

An I/O error occurred during the data transfer.

Remedy · Remède

Cold start the controller, and retry the operation.

Frequently asked · Questions fréquentes

What does FANUC alarm PALL-021 mean?
FANUC PALL-021 (“IO_STATUS error occurred”): An I/O error occurred during the data transfer.
How do you troubleshoot FANUC alarm PALL-021?
Cold start the controller, and retry the operation.

Related codes / Codes liés

PALL-019Could not create unit load filePALL-020Could not open .DT file for readPALL-022Could not save .VR file %sPALL-024Could not load file %s

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 →