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FANUC Alarm FILE-040 — WARN Illegal file access mode

FANUC FILE-040 (“WARN Illegal file access mode”): You tried to read from a write only opened file or tried to write to a read only opened file. First check: Open a file with correct access mode.

Updated 2026-08-29 · LogrobotLM reference

Description

You tried to read from a write only opened file or tried to write to a read only opened file.

Remedy · Remède

Open a file with correct access mode.

Frequently asked · Questions fréquentes

What does FANUC alarm FILE-040 mean?
FANUC FILE-040 (“WARN Illegal file access mode”): You tried to read from a write only opened file or tried to write to a read only opened file.
How do you troubleshoot FANUC alarm FILE-040?
Open a file with correct access mode.

Related codes / Codes liés

FILE-038WARN File locked by too many tasksFILE-039WARN Directory already existsFILE-041WARN File not lockedFILE-042WARN ( this is an internal code)

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 →