What is PLC -

PLC programming controller, can be ( ProgrammablelogicController) , refers to computer technology as the foundation of new industrial control device.

in 1987, the international electrotechnical commission ( InternationalElectricalCommittee) By the PLC in the draft standard for PLC made the following definition: 'PLC is a kind of specially designed for application in industrial environment and digital computing operation of electronic devices. It can adopt program memory, used in its internal storage to perform logic operation, sequence operation, timing, counting and arithmetic operations such as instruction, and can through digital or analog input and output, control various types of machinery or production process. PLC and related peripheral equipment should press easily and industrial control system to form a whole, easy to extend its function and the principle of design. '

PLC than the PC's CPU, its characteristic is has a strong ability of data acquisition and process of a kind of automatic control of good processing ability, in industrial, manufacturing, civil such as elevators, automatic washing machine has been widely used in process control.

in the 1960 s the United States launched a programmable logic controller, to replace the traditional relay control device, from then on, the PLC technology rapid development, has been widely used throughout the world. The function of PLC is also constantly improving. Along with the computer technology, signal processing technology, control technology, the development of network technology and the continuous improvement of user requirements, the function of PLC is also constantly improve, PLC on the basis of switch process and increased the analog processing and motion control, and other functions. Today is no longer limited to the logic control of PLC, motion control, process control and other fields also plays a very important role.

in recent 10 years, as PLC prices falling and the expansion of the user requirements, more and more small and medium-sized equipment adopted PLC controller control, PLC application in our country is growing very quickly. As China's economy and the rapid development of basic automation level unceasing enhancement, the future for a period of PLC controller will continue to maintain rapid growth momentum in our country. General PLC is applied to special equipment can be thought of as it is an embedded controller, but relatively general embedded controller and PLC has higher reliability and better stability. Encountered in practical work of some user originally USES the embedded controller, are now gradually universal PLC or custom PLC controller to replace the embedded controller, PLC industry will have a bright future.

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