PLC Introduction

What is PLC?

Let us have a quick look.

A PLC or Programmable Logic Controller is simply a special computer that is programmed to control certain process 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 the CPU. Then we connect the switch to input and the motor to 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 CPU is 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 button again, the process repeats and the motor will turn off.


This is the brief introduction of PLC. Hope you will enjoy!

Our PLC on window patching machine is Japanese brand Panasonic, good quality. We use premium selected components to make sure the machine be stable and durable.

(Statement: This passage is mainly summarized from Youtube Channel ” Realpar”. If this offend your rights, please contact us and we will delete it.)

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