The development of PLC programmable controller and the development direction

A and the overseas development situation since the advent of PLC controller, PLC after 40 years of development, in the United States, Germany, Japan and other developed countries has become one of important industry. The world's total sales rising, manufacturers constantly emerging, varieties appeared unceasingly. The sharp rise in production output and prices are falling. At present, there are more than 200 manufacturers in the world of PLC, a famous: the United States: AB ge, modicon company; Japan: mitsubishi, Fuji, omron, matsushita electric, etc; Germany: Siemens; France: TE schneider company; Korea: samsung, LG, etc. 1 second, technology development trend. Products to develop in the direction of large and small two large scale: the I/O points to 14336 points, more than 32 bit microprocessor, CPU parallel work, mass storage, high speed scanning speed. Small: from the whole structure to the development of small modular structure, increase the flexibility of configuration, reduce the cost. 2. PLC controller in the closed loop process control is widely applied in 3. Continue to strengthen communication function 4. New components and modules are introduced high-end PLC besides mainly adopts CPU in order to improve the processing speed, and processor EPROM or RAM intelligent I/O modules, high-speed counter module, remote I/O module customization module. 5. Diverse programming tool, the function, the programming language toward standardization has a variety of simple or complex programming and programming software, the ladder diagram, function diagram, the statement list, such as programming language, also have high-grade PLC controller instruction system. 6. Development of fault-tolerant technology USES the hot standby or work in parallel, the workings of a majority vote. 7. The pursuit of the standardization of software and hardware. Three, the domestic development and applications of the PLC product development and production of experienced three stages: sequence controller ( 1973 ~ 1979) — — A processor based industrial controller ( 1979 ~ 1985) — — 8 bit microprocessor based programmable controller ( After the 1985) 。 Under the impetus of the opening-up policy, foreign PLC products into the market in China, the part with the import of complete sets of equipment. Such as baosteel, the second phase is the introduction of more than 500 sets, and xianyang picture tube factory, qinhuangdao coal terminal, factory, etc. Now, PLC at home also has a great application in all walks of life, is becoming more and more high technology content.
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