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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 SYST-256 — Servo OFF input

FANUC SYST-256 (“Servo OFF input”): This operation requires the Servo OFF input. First check: Check the status of the Servo OFF input.

Updated 2026-08-29 · LogrobotLM reference

Description

This operation requires the Servo OFF input.

Remedy · Remède

Check the status of the Servo OFF input.

Frequently asked · Questions fréquentes

What does FANUC alarm SYST-256 mean?
FANUC SYST-256 (“Servo OFF input”): This operation requires the Servo OFF input.
How do you troubleshoot FANUC alarm SYST-256?
Check the status of the Servo OFF input.

Related codes / Codes liés

SYST-254Safe stop inputSYST-255No Teach OK inputSYST-257No Ext. Hold Relase inputSYST-258Operator panel hold

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 →