A #PLC, or Programmable Logic Controller, is a specialized computer with hardware components like a processor (CPU and memory), power supply, input/output modules, and a programming device. Modern PLCs replace traditional hardware circuitry in industrial applications, though original devices still connect to the PLC. The power supply provides DC power to PLC modules, while input/output modules connect to digital or analog field devices. Typically, a laptop or desktop is used for programming. | R