A PLC control system is the foundation of every reliable automated parking system, providing real-time control of sensors, motors, VFDs, and safety devices. This guide explains PLC architecture, I/O processing, vehicle routing, communication networks, redundancy, virtual commissioning, and BMS integration. It also covers maintenance strategies, hardware protection, and system scalability, helping developers and engineers build safe, efficient, and highly reliable automated parking facilities with optimized performance and long-term operational stability.