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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 LANG-099 — Write protection violation

FANUC LANG-099 (“Write protection violation”): The disk has write protection. First check: Remove the write protection.

Updated 2026-08-29 · LogrobotLM reference

Description

The disk has write protection.

Remedy · Remède

Remove the write protection.

Frequently asked · Questions fréquentes

What does FANUC alarm LANG-099 mean?
FANUC LANG-099 (“Write protection violation”): The disk has write protection.
How do you troubleshoot FANUC alarm LANG-099?
Remove the write protection.

Related codes / Codes liés

LANG-097WARN Only one file may be openedLANG-098WARN Disk timeoutLANG-100WARN Device error

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 →