The development of PLC and the development trend of the future

1) , PLC development present situation at present, with large scale and very large scale integrated circuit and microelectronic technology, the development of PLC has been developed from the initial development of a machine to now made up of 16 - and 32-bit microprocessor is realized the PC, and achieve the multi-channel processing of multiprocessor. Nowadays, PLC technology has very mature, not only enhanced control function, power consumption and reduced volume, cost reduction, increased reliability, programming and failure detection is more flexible and convenient, and with the remote I/O and communication network, data processing and the development of image display, make the PLC to control used in continuous production process in the direction of the development, has become one of the pillars of industrial production automation. Now, there are more than 200 PLC manufacturers in the world, more than 400 varieties of PLC products, according to the region can be divided into three schools such as the United States, Europe, and Japan products, various schools of PLC products have different characteristics. Among them, the United States is the PLC controller production country, there are more than 100 PLC manufacturers, famous has A minus B company, general electric ( GE) Companies, modicon ( 莫迪康) The company. The PLC main products manufacturers with Germany's Siemens ( SIEMENS） Company, AEG, French TE. Japan has many PLC manufacturers, such as mitsubishi, omron, panasonic, Fuji, etc. , South Korea's samsung, 三星) , LG, etc. , the manufacturer's products occupy more than 80% of the PLC market share. After years of development, about 30 domestic PLC manufacturers, domestic PLC application market still is given priority to with foreign products. Domestic companies to do business of PLC have a greater competitive advantage, such as: demand, product customization, cost advantage and service advantage, response speed advantage. 2) , the development trend of PLC controller the widening of the application of PLC controller, the PLC technology and its product structure have been improved, the increasingly powerful, cost performance is higher and higher. ( 1) , in terms of product size, development toward the poles. On the one hand, vigorously develop faster, higher ratio of small and microminiature PLC. To meet the needs of the single and small automatic control. On the other hand, the high speed, large capacity and large PLC technology to improve the direction. With the ever increase of the requirements of complex system control and the continuous development of the microprocessor and computer technology, information processing speed of PLC is becoming more and more demanding, require the user to the memory capacity is becoming more and more big. ( 2) PLC network control, to the communication network development is the trend of the current control system and PLC technology development. Networking communication between PLC and PLC, PLC and upper computer networking communication has been widely used. At present, the PLC manufacturers in developing its own dedicated communication module and PLC network communication software to enhance capacity. The PLC manufacturers also specified in the negotiations between the general standard of communication, to form a larger network system. PLC has become a collecting and distributing control system ( DCS） An integral part of. ( 3) Intelligent, modular, development to meet the needs of various industrial automation control system, in recent years, the PLC manufacturers have developed many new components and modules, such as intelligent I/O module, temperature control module and dedicated a special intelligent module for PLC external fault detection, etc. , development and application of these modules not only enhances the functions, expands the application range of the PLC, also improve the reliability of the system. ( 4) , the diversity of the programming language and programming tools and standardized coexist, complementary and development of a variety of programming languages is a trend of PLC software progress. PLC manufacturer in making hardware and programming tools and upgrading frequently, rich variety, function to improve at the same time, rising to the MAP ( Manufacturing automation protocol) Together, make the PLC basic components, including input and output module, communication protocols and programming languages and programming tools of technology and standardization.
The plc manufacturers approach to programmable control systems is becoming increasingly popular; consequently, there is a surge in the demand for .
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