A PLC (Programmable Logic Controller) is an electronic device used to control machines and industrial processes automatically. It works like a small computer designed for factory use. A PLC receives input signals from sensors and switches, processes them using a logic program, and sends output signals to control motors, valves, or lights. In short, a PLC replaces hard-wired relay systems and allows machines to run based on programmed instructions.
The main advantage of a PLC is flexibility — you can easily change the machine’s operation by modifying the program instead of rewiring circuits. PLCs are widely used in manufacturing plants, packaging lines, elevators, and automation systems. They are reliable, fast, and built to handle harsh industrial conditions. So, when someone says PLC, it simply means a smart, programmable controller that automates the operation of industrial equipment.