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 2026-09-17 · LogrobotLM reference
Description
An I/O error occurred during the data transfer.
Remedy
Cold start the controller, and retry the operation.
Related codes
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 →