PLC programmable controller in the development of our country condition at home and abroad

Recognized in the world the first PLC controller is the digital equipment corporation (1969 12月) Developed. Limited to the conditions of electronic components and computer development level, the early PLC is mainly composed of discrete component and small and medium scale integrated circuit, can complete the simple logic control and timing, counting function. In the early 1970 s microprocessors came into being. People quickly into the programmable controller, PLC increased operation, data transmission and processing, and other functions, completed the real characteristics of industrial control device with the computer. In order to facilitate familiar with relays, contactors systems engineering and technical personnel to use, programmable controller adopts and relay circuit diagram similar ladder diagram as the main programming language, and will take part in the operation and processing of computer storage elements are named after the relay. At this time of the PLC for the microcomputer technology and relay the combination of the conventional control concept. During the 1970 s, the programmable controller into the practical stage of development, computer technology has a comprehensive introduction of programmable controller, make it happened. Higher computing speed, subminiature volume, more reliable industrial anti-interference design, analog computation, the PID function and high cost performance has established its status in modern industry. In the early 1980 s, PLC has been widely used in the advanced industrial countries. Of the development of the programmable controller in this period is characterized by large scale, high speed, high performance, product seriation. Another feature of this stage is in the production of programmable controller in the world countries growing, production is rising. This marked the programmable controller has stepped into mature stage. The late 20th century, the development characteristic of programmable controller is more suitable for the need of modern industry. This period, from the control of scale development of the mainframe and minicomputer; From the control ability, gave birth to a variety of special function unit, used for pressure, temperature, speed, displacement and so on all kinds of control occasions; From the product of form a complete set of ability, production all kinds of man-machine interface unit, communication unit, the application of PLC industrial control equipment of form a complete set more easily. At present, the programmable controller in machinery manufacturing, petrochemical, metallurgical steel, automobile, light industry and other fields of application have been greatly developed. Our country programmable controller introduction, application, development, production is accompanied by reform and opening up. Originally the programmable controller is used in great quantities in the introduction of equipment. In the production equipment and all kinds of enterprises and products in the growing of the applications of PLC controller. At present, our country can produce middle and small programmable controller himself. Shanghai east house electric co. , LTD. Production of CF series, hangzhou machine tool electrical appliance factory production of DKK and D series, dalian modular machine tool research institute S series, electronic computer in suzhou factory production YZ series and other products have a certain scale and the application in industrial products. In addition, wuxi hua company, Shanghai township island company for sino-foreign joint venture is more famous in China, such as PLC controller manufacturers. Can be expected, with the deepening of China's modernization process, the PLC will have wider application in our country the heavens and the earth.
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