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FANUC Alarm PALT-021 — WARN IO_STATUS error occurred

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

Updated 2026-08-29 · LogrobotLM reference

Description

An I/O error occurred during data transfer

Remedy · Remède

Cold start the controller and retry .

Frequently asked · Questions fréquentes

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

Related codes / Codes liés

PALT-019PAUSE Could not create unit load filePALT-020ABORT Could not open .DT file for readPALT-022WARN Could not save .VR file %sPALT-024ABORT Calculation error occured

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 →