FANUC Alarm FXTL-035 — Unmatched BUILD_BEGIN or loop
FANUC FXTL-035 (“Unmatched BUILD_BEGIN or loop”): A BUILD_BEGIN did not have a BUILD_END, a LOOP_BEGIN did not have a LOOP_END, or there was some other error in matching looping statements. First check: Correct the model files and copy them to the controller.
Updated 2026-09-17 · LogrobotLM reference
Description
A BUILD_BEGIN did not have a BUILD_END, a LOOP_BEGIN did not have a LOOP_END, or there was some other error in matching looping statements.
Remedy
Correct the model files and copy them to the controller.
Related codes
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 →