During the final‑assembly stage, the motor‑start protection unit with digital inputs is mounted on the conveyors that move vehicle bodies from the stamping press to the paint shop. It monitors the start‑up channel of each drive motor, blocks any premature activation, and reports the status of the digital sensors that confirm the presence of a chassis before power is applied. By doing so, the module prevents motor damage caused by accidental energisation while a body is still being positioned, and it provides the PLC with a reliable “ready‑to‑run” signal that synchronises the line’s timing. In the same plant, the same unit is often reused on the robotic arms that install windshields, where it safeguards the high‑torque servomotors and validates the door‑open switches before the arm begins its motion. This dual use keeps the assembly line running smoothly, reduces unplanned downtime, and allows operators to focus on quality checks rather than motor‑start troubleshooting.