At the moment the chassis platform reaches the final stop of the paint‑curtain line, the Euchner limit switch closes to tell the PLC that the part is correctly positioned and that the next robot can start its weld cycle. The switch is mounted on the guide rail of the transfer cart and detects the exact moment the cart’s travel is complete, generating a reliable signal that initiates the conveyor’s braking sequence and unlocks the downstream assembly cell. By providing a definitive end‑of‑stroke indication, it prevents over‑travel of the cart, protects the paint coating from damage, and synchronises the timing of downstream presses, robots and quality‑check stations. Its snap‑action mechanism tolerates the repetitive impacts of a high‑throughput line, allowing the plant to run continuously without manual adjustments. When a fault is detected, the same switch feeds the diagnostic routine of the maintenance service system, enabling technicians to locate the offending station quickly and replace the unit with minimal downtime. This precise positioning feedback is essential for keeping the vehicle‑body flow steady and error‑free.