In a body‑in‑white welding cell, the Johnson module is mounted on the main control cabinet and acts as the central interface for coordinating the laser‑welding robot, the conveyor belt, and the vision inspection system. By gathering status signals from the robot’s servo drives and feeding them to the line‑management PLC, the module enables precise timing of each weld pass, allowing the cell to keep up with the high‑speed production rhythm of modern car manufacturers. When a new sheet metal panel arrives, the module triggers the conveyor to position the part, signals the robot to start the welding sequence, and then confirms completion before releasing the panel to the next station. This seamless hand‑off reduces idle time and prevents bottlenecks during the critical early stages of vehicle assembly. In addition to welding cells, the same unit is frequently used in paint‑shop pre‑treatment lines, where it synchronises spray booths and drying ovens to maintain a steady flow of chassis components through the coating process. The result is a more predictable line cadence and higher overall plant throughput.