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What is PLC.


What is PLC.


As a typical application of industrial automation, PLC was originally produced as a substitution for relay circuit and sequential control. Later, PLC manufacturers gradually increased the functions of analog calculation, PID function and more reliable industrial anti-jamming technology, and increased various communication interfaces with the demand of network. With the development of fieldbus technology and Ethernet technology, the application scope of PLC is more and more extensive.


Programmable Controller is a member of the computer family, is designed and manufactured for industrial control applications. The early programmable logic controller is called Programmable Logic Controller (PLC). It is mainly used instead of relay to realize logic control.


The International Electrotechnical Commission (IEC) promulgated the third draft of the standard for programmable controller in 1987. In the draft, the definition of PLC is as follows:


Programmable Controller (PLC) is an electronic system of digital operation, designed for industrial applications. It uses programmable memory to store instructions for performing logical operations, sequential control, timing, counting and arithmetic operations, and controls various types of machinery or production processes through digital and analog inputs and outputs. Programmable controllers and their peripherals should be designed in accordance with the principle of easy integration with industrial systems and easy expansion of their functions.


With the development of technology, the function of this device has greatly exceeded the scope of logical control, so today this device is called programmable controller, short for PC. But in order to avoid confusion with personal computer, PLC is called PLC for short.


With a series of fiber optic sensors, photoelectric sensors, RGB color sensors, proximity switches and other sensors, Heyi Technology, together with modern PLC, provides high-quality solutions for the automation industry.