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A programmable logic controller (abbreviated as "PLC") is a computer used to solve problems in a specific assembly process. These devices come in a wide variety of shapes and sizes, and have many alternative options, can be used for computerized and simple I/O, and have the function of preventing high temperature, vibration and electrical noise. The invention of PLC allowed to simplify the computer into an industrial automation process.

The following figure shows the process of the programmable logic controller system.

The following figure shows the process of the programmable logic controller system.

History of PLC

Programmable logic controllers (PLC) first appeared in the late 1960s. The main purpose of planning this equipment is to eliminate the high cost of replacing the complex relay-based control systems required by major US automakers. There is a major problem, and that is that they are mechanical. This means that they wear out and must be replaced from time to time. In addition, the relay takes up too much space. These and different considerations prompted the development of PLC. In the 1970s, more improvements were made to the PLC. In 1973, communication took place between PLCs. This allows the control circuit to be executed at a certain distance from the control machine. In some cases, the lack of institutionalization of PLC led to different problems. This was improved in the 1980s. The size of the PLC is further reduced, which means that the factory can use space more efficiently. In the 1990s, the way to modify the PLC was expanded, such as block programs and manual lists. They also observed that PLC was replaced by PC in some cases. Nevertheless, PLC is still used in a wide range of businesses and will remain in this state for the foreseeable future.

Working principle "three tasks"

The working method of PLC is very simple: PLC receives data from associated sensors or information equipment, processes the information, and triggers output according to predefined parameters.