CONCEPT 04 / AUTOMATION
Programmable logic controllers
THE KEY CONCEPT
PLC stands for programmable logic controller. It is an electronic control system used to automate machinery and processes.
How it works
A PLC is a programmable industrial electronic controller. It reads input signals, executes stored control logic, and updates its outputs.
Inputs can come from sensors, switches, or buttons. Outputs can control equipment such as motors, valves, and indicator lights.
For example, a sensor detects an object on a conveyor. The PLC evaluates its programmed logic and activates an output to stop the conveyor or move the object.
Remember this
Read inputs → execute logic → update outputs.