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FANUC Alarm LANG-081 — Invalid application header

FANUC LANG-081 (“Invalid application header”): The Ascii Input encountered an error in the application section. First check: Fix the /APPL section of the .LS file.

Updated 2026-08-29 · LogrobotLM reference

Description

The Ascii Input encountered an error in the application section.

Remedy · Remède

Fix the /APPL section of the .LS file.

Frequently asked · Questions fréquentes

What does FANUC alarm LANG-081 mean?
FANUC LANG-081 (“Invalid application header”): The Ascii Input encountered an error in the application section.
How do you troubleshoot FANUC alarm LANG-081?
Fix the /APPL section of the .LS file.

Related codes / Codes liés

LANG-079Invalid sectionLANG-080Invalid filenameLANG-090Buffer is too smallLANG-091Can't print optimize data

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 →