PLC block diagram

About this PLC block diagram

The diagram illustrates the general configuration of a Programmable Logic Controller (PLC); this is a digital computer utilized in industrial applications.

Integral to the PLC is the Central Processing Unit or CPU which runs the control program by accepting data from input modules, making calculations, carrying out mathematical and logical computation, and issuing control signals to the output modules. This unit sees to it that the PLC is supplied with steady electric power to enable it to function optimally.

The input modules interpret signals from the sensors, switches, and other devices and translate those into signals that are readable by the CPU. Output modules on the other hand translate CPU signals to formats that apply to actuators, motors, and other output devices.

The data storing unit in the memory unit of the PLC contains control program data and the configuration as important information for the operation of the PLC as well as future use. This programming device enables the user to develop the control program and to upload it into the PLC and it has a graphic interface for creating the automation solutions.

In conclusion, the PLC is one of the most effective and universal control systems applied in industries, and the presented diagram helped to comprehend the general structure and the jobs of its components.