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FANUC Alarm LANG-091 — Can't print optimize data

FANUC LANG-091 (“Can't print optimize data”): Optimize data exists in the program and this cannot be printed. First check: Special handling may occur for programs which contain optmized data.

Updated 2026-09-17 · LogrobotLM reference

Description

Optimize data exists in the program and this cannot be printed.

Remedy

Special handling may occur for programs which contain optmized data.

Related codes

LANG-081Invalid application headerLANG-090Buffer is too smallLANG-094WARN File already existsLANG-095WARN File does not exist

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 →