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FANUC Alarm WNDW-021 — WARN Invalid timeout value

FANUC WNDW-021 (“WARN Invalid timeout value”): The time_out value in a READ_KB call is Invalid First check: The value must be less than 65535000.

Updated 2026-09-17 · LogrobotLM reference

Description

The time_out value in a READ_KB call is Invalid

Remedy

The value must be less than 65535000. Use a valid value

Related codes

WNDW-019WARN Write to file w/o windowWNDW-020WARN Bad buffer length on readWNDW-022WARN Zero term char mask in readWNDW-023WARN Initial data too long

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 →