Quick! A Programmable Logic Controller or PLC is simply a special computer that is programmed to control certain processes in industries like petroleum, Steel or automotive. Every PLC is composed of three main parts: Input, CPU and Output.
Suppose that we have an electrical motor and a push button. We want the motor to turn on when the button is pressed. When the button is pressed again, we want the motor to turn off.
This function is similar to the function of the power button on your TV remote. To do this, we must first write a program for this operation on a computer and then download it to theCPU. Then we connect the switch to the input and the motor to the output.
Now if we press the button, an electrical signal will be sent to the PLC. The PLC input will deliver this signal to the CPU but first must present it in a format that the CPU can process. Why?
Because the CPUis a computer system and cannot process the raw electrical signal. The CPU will process the data received and send the result to the output. The output turns the data to a raw electrical signal again and applies that to the motor and turns it on.
Now if we press the buttonagain, the process repeats and the motor will turn off. Okay If you liked this video subscribe to stay updated with our new videos.
