毕业论文外文翻译-浅谈PLC技术进展情况.doc
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1、Talks on the developmental and outlook of PLCXIA Xue-ming , JIA Ying-bu (Northern Mach-Election Vocational School,Zhangjiakou 075000,China)Abstract:With the development of corporated circuits and technique of computers,the-fifth-generation PLC has come into being Due to the advantages of stablility,
2、reliability,cheap price ,full functions,convenient to use and easy to operate and maintenance,it has been widely used.With the network of PLC,It will be used more widely.Key words:PLC, Development, Market, Interface1 PLC development and the market situation1.1 The history of the development of PLC 1
3、968 General Motors Corporation proposed to replace relay control device requirements, the next year digital equipment company developed the first generation of programmable controller, the company assembly line requirements. Entered the 1970s in the 20th century, with the development of microelectro
4、nics technology, particularly using microprocessor PLC, This controller is not confined to the logic of the operation, has further strengthened the functional integration, now the fifth generation of PLC products.In the 1980s to the mid-1990s, the PLC is the fastest-growing period, the annual growth
5、 rate has been maintained at 30% 40%. As PLC Handling capacity and network simulation functions of the progress, DCS diverting part of the gradual monopolization of the market and sewage treatment industries, but due to the emergence of industrial PC. In recent years in particular fieldbus technolog
6、y development, IPC and FCS also diverting part of the PLC market. So PLC growth rate in recent years, has gradually slowed down.1.2 China PLC marketApplication of the PLC, China is very active in recent years into the new year about 100,000 sets of PLC products, with annual sales of three billion yu
7、an, and application industry are quite extensive. PLC domestic production of about 30 plants, but did not become a full-scale production capacity and brand-name products There is some imitation, component assembly or label means of production, Therefore we can say PLC in China has not formed manufac
8、turing industries. As a principle, technical and technological no difficulty in cutting-edge technology products, as long as the effort is to create the manufacturing industries.Products in the market potential is enormous, not only in our country, even in advanced industrial Japan, a survey showed
9、that PLC supporting electromechanical integration products accounted for 42%, using relays, contactors still control 24%. Therefore, require the application of the PLC are still many occasions. From the perspective of technological innovation, Chinas large and medium-sized enterprises should vigorou
10、sly CIMS (Computer Integrated Manufacturing System), factory machinery to the formation of FMS flexible manufacturing system, PLC is the foundation, so PLC market is broad. PLC with stable,reliable,cheap, multifunctional application flexibility, ease of maintenance and operation of the merits, This
11、is it can be widely used in the root causes. 2 PLC networks and the trend One or a number of PLC and PC system out together, play PC original programming and a man-machine interface to the operating station, This 20th century, the 1990s New Wave, such as system integration brings opportunities Meanw
12、hile programming software and human-machine interface software (monitoring software or configuration software) and the software interface has been developed.In recent years, the PLC CPU manufacturers in the original template provided the basis for RS232/422/485 interfaces, gradually add to the varie
13、ty of communications interfaces, and to provide complete communication network. Data due to the recent rapid development of communications technology, user requirements for open very strong, Fieldbus and Ethernet technology developments, So PLC PCS system than the DCS which open some of the status q
14、uo pretty.2001 Chinas machinery industry has become a new bright spot in industrial development, the output value last year, up 17.15%. Automobile output of the worlds top ten, machine output of the worlds No. 5. Machinery Industry profit growth 33.35%, accounting for the entire industry more than 6
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