In a modern washing‑machine assembly line, the ABB controller unit resides on the main conveyor station that synchronises the drum‑mounting, motor‑installation and water‑seal fitting operations. By collecting signals from position sensors, torque transducers and safety switches, it orchestrates the precise timing of each robotic arm, guaranteeing that the motor is coupled only after the drum is correctly aligned. The controller also communicates with the downstream testing cell, sending a ready flag that triggers the automatic leak‑check and spin‑balance verification before the unit moves to final packaging. This coordination eliminates manual intervention, reduces cycle time, and maintains consistent quality across high‑volume production. The same controller is employed on refrigerator line modules where it manages the compressor‑start sequence, monitors door‑seal integrity sensors and regulates the defrost heater cycle, ensuring each appliance meets energy‑efficiency standards before leaving the line. For plant operators, the controller can be integrated into a supervisory system to log fault codes and schedule preventive maintenance, keeping the production line running with minimal downtime.