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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 2026-09-17 · LogrobotLM reference

Description

The disk has write protection.

Remedy

Remove the write protection.

Related codes

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. How this reference is built →