Before diving deeper into how Unlock PLC Expert works with PLCs, it’s important to understand what a PLC is. A PLC is a ruggedized computer used for automation and control of industrial processes. It serves as the brain behind various machines and systems, taking inputs (e.g., sensors, switches) and providing outputs (e.g., motors, lights) based on predefined programming logic. PLCs are an integral part of the backbone of modern manufacturing, from assembly lines to complex process controls.