Basic knowledge of the PLC, authoritative definition of PLC

As the microprocessor, the rapid development of computer and digital communication technology, computer control has been extended to almost all industrial fields. Modern society requires manufacturing respond quickly to market demand, production of small batch, many varieties, many specifications, low cost and high quality products, in order to meet this requirement, production equipment and automatic production line control system must have high reliability and flexibility, the PLC ( Programmable Logic Controller, Programmable Controller) It was comply with this requirement, it is based on microprocessor general industrial control device. PLC application widely, powerful functions, easy to use, has become one of the main device of modern industrial automation, in all areas of industrial production has been widely used, in other areas, Such as civil and home automation) The application of rapid development. The international electrotechnical commission ( IEC) PLC in 1985 draft standard in draft 3, PLC made in the following definition: 'programmable controller is a kind of digital computing operations electronic systems, specially designed for application in industrial environment. It USES a programmable memory, used in its internal storage to perform logical operations, sequential control, timing, counting and arithmetic operations such as instruction, and through digital and analog input and output, control various types of machinery or production process. Programmable controller and related equipment, should be according to the industrial control system is easy to form a whole, easy to expand its function on the principle of design. 'Can be seen from the above definition, is a kind of application of PLC to change the control function of industrial control computer, besides can finish all kinds of control functions, and the computer communication network and other functions. Application of PLC in the obtained the rapid development of our country, it has been widely used in various mechanical equipment and production process of electric control devices, from all walks of life also emerged a large number of application of PLC controller to retrofit the results. To understand the working principle of the PLC has the ability to design, debugging and maintenance of PLC control system, has become a modern industrial electrical technicians and the basic requirements for engineering students.
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The global market is estimated to reach a value of almost plc controller price in the next decade. have a robust position in the programmable control systems market because of its proven high potency in plc controller price.