LogrobotLM

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 →

FANUC Alarm FXTL-156 — Program is undefined.

FANUC FXTL-156 (“Program is undefined.”): Not all units are in the correct position for a model move. First check: Go to the model move menu and move the tray to a model move position.

Updated 2026-09-17 · LogrobotLM reference

Description

Not all units are in the correct position for a model move. The Tray cannot determine which program it is in.

Remedy

Go to the model move menu and move the tray to a model move position.

Related codes

FXTL-154No tray is defined.FXTL-155Invalid step number.FXTL-157Cannot copy file to same devFXTL-158No unit in the Tray.

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 →