浅析plc控制技术应用现状与发展（Application status and development of PLC control technology）

1、浅析plc控制技术应用现状与发展（Application status and development of PLC control technology）Application status and development of PLC control technologyKey recommendation | website | business center. | Information Center | paper center | | test center | secretarial center center center | | teaching courseware sof

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6、s source: 214 hits: 385 update: 2009-5-10 14:30:00Application status and development of PLC control technologyAbstract: PLC (Programmable, Logic)Controller) has played an important role in the field of industrial automation control since its inception. This paper introduces the development process o

7、f PLC and its current application situation at home and abroad, and expounds its future development trend.Key words: PLC control technology, application, status quo, developmentIntroductionIn the modern industrial equipment and process automation projects, a large number of digital switching and ana

8、log control devices will be encountered. Such as the motor stop start, electromagnetic valve opening and closing, product count and other physical quantity settings and control. Traditional industrial automatic control is mainly realized by relays or separated electronic circuits. Although this cont

9、rol method is inexpensive, it has a certain market in some simple products,But it has some flaws. In order to overcome this drawback, various countries have developed programmable logic controller instead of relay control, because of its reliability, anti-interference and other factors, the relay ca

10、n not match. At present, the representative of industrial control are programmable controller (PLC), industrial control computer and computer distributed control system (DCS). In this paper, the application status and development trend of PLC technology are discussed.Characteristics and application

11、fields of 1. PLC control technologyPLC (Programmable Logic)Controller) is the abbreviation of programmable logic controller (PLC). It is a new and universal automatic control device, which is developed with computer technology, electrical control technology, automatic control technology and communic

12、ation technology. PLC has the following characteristics: 1, high reliability; 2 programming convenient and easy to use; 3 control function is very strong; 4 extension machine and external connection is very convenient.After more than 20 years of industrial applications, PLC features have become incr

13、easingly recognized and accepted by the broad masses of the industry, making PLC rapidly penetrate all areas of industrial control:(1) logic control of switch quantity.(2) motion control.(3) closed loop process control.(4) data processing.(5) robot control.2. domestic and international PLC applicati

14、on statusThe worlds first known PLC was developed by American Digital Equipment Corporation (DEC) in 1969. Limited to the current component conditions and computer development level, the early PLC is mainly composed of discrete components and small and medium scale integrated circuits, which can per

15、form simple logic control and timing and counting functions.Microprocessors appeared in the early 1970s. People quickly introduced it into programmable logic controller, which enabled PLC to add functions such as operation, data transmission and processing, and completed industrial control devices w

16、ith computer characteristics. In order to facilitate the engineering and technical personnel familiar with the relay contact system can use ladder programming controller and relay circuit with similar as the main programming language, computer storage devices and will participate in the operation an

17、d processing are named to the relay. Right nowPLC is the product of the combination of microcomputer technology and conventional relay control concepts.In the middle and late 1970s, programmable logic controller entered the stage of practical development. Computer technology has been fully introduce

18、d into programmable logic controller and made its function leap. Higher computing speed, ultra small volume, more reliable industrial anti-interference design, analog operation, PID function and high cost performance have laid its position in modern industry. Programmable controllers were widely use

19、d in advanced industrial countries in the early 1980s. The development of programmable controller in this period is characterized by large scale, high speed, high performance and serialization of products. Another feature of this phase is the increasing number of countries that produce programmable

20、controllers worldwide,yieldIncreasing, this marks the maturity of programmable controllers.At the end of the twentieth Century, the development of programmable controllers was more suited to the needs of modern industry. From the control scale, the period of development of the large machine and supe

21、r minicomputer; from the control, the birth of various special function unit, used to control the pressure, temperature, speed, where every kind of displacement; from product necessary ability, producing a variety of man-machine interface unit, communication unit. The application of programmable con

22、troller in the industrial control equipment supporting more easily. At present, the programmable controller in the machinery manufacture, the petroleum chemical industry, the metallurgy, the iron and steel, the automobile and the light industry and so on domain application has obtained the considera

23、ble development.The introduction, application, development and production of programmable logic controller in our country are accompanied by reform and opening to the outside world. Initially, a large number of programmable controllers were used in the imported equipment. Then, the production of equ

24、ipment and products in various enterprises, expanding the application of PLC. At present, our country has been able to produce small and medium programmable controllers. YZ series of a variety of products such as Shanghai Dongwu Electric Company Limited production of the CF series, Hangzhou electric

25、 machine factory production of DKK and D series, combination of Dalian Machine Tool Research Institute Series S production, Suzhou electronic computer factory production has a certain scale and has been used in industrial products. It can be expected that with the deepening of Chinas modernization p

26、rocess, PLC will have a wider application field in china.3.PLC development prospectsWith the development of computer science and the increasing demand of industrial automation, programmable control technology has been developed rapidly, and its technology and products are becoming more and more perf

27、ect. Only PLC control switch of the era of the past, PLC not only for its good performance to meet the wide needs of industrial production, and the communication technology and information processing technology, its function has become more and more perfect. In the future, PLC will mainly develop in

28、 the following two directions: one is to develop toward ultra small, private and low price, and the other is to develop high-speed, multi-functional and distributed automation network. The general trend of development is as follows:1 standardizationThe competitiveness of an automation product lies p

29、rimarily in meeting the international standards and levels of standardization. Standardization, on the one hand, guarantees the quality of the products, and on the other hand ensures the compatibility of the products of each manufacturer. Therefore, the standardization of programmable technology is

30、imperative.2CPU processing speed is further acceleratedIn the future, 64 bit RISC chips will be used to realize multi CPU parallel processing or time-sharing processing or sub task processing, so that various modules can be implemented intelligently, and some of the system programs can be solidified

31、 with gate array circuits. In this way, the PLC executes instructions at a nanosecond rate.3 integration, communication and networkingBecause of the complexity and difficulty of controlling the content, PLC will integrate with PC, integrate with DCS, and integrate with PID.Networking and strengtheni

32、ng communication capabilities are also important developments in PLC, especially the growth of control products based on PC. PLC is integrated with PC to integrate computer, PLC and operators man-machine interface, so thatPLC can make use of computers rich software resources, while computers can and

33、PLC modules interactively access data. The PC based control method makes the user programming more convenient and provides an open architecture that allows users to select PLC of all types of manufacturers as neededI/O devices are interconnected to reduce production costs and productivity.New develo

34、pments in 4PLC - soft PLCWith the rapid development of computer software and hardware technology, automatic control technology has been promoted and a series of new developments have been achieved. At present, many industrial automatic control products and mechatronic products have begun to shift to

35、 a computer based control system, which is called soft PLC. The actual use of soft PLC software to realize the functions of traditional PLC, its biggest advantage is the flexibility scalability, the user can select a variety of hardware products from different manufacturers, make full use of the bes

36、t characteristics of each software, the control system is composed of the best. It is also very convenient to connect with the hardware. there is no lack ofThe I/O card can be directly connected to the SOFTPLC on the computer bus. Thus, in the two aspects of software and hardware, it can achieve the

37、 perfect combination of industrial computer and PLC performance, and facilitate the performance expansion and human-computer communication. It is a major trend of PLC development in the future.Concluding remarksPLC has gone through nearly 40 years of mileage, PLC with its compact structure, high rel

38、iability, powerful function, fast speed, low price advantages, has been widely used, and has become the mainstream of industrial control systems. At present, the control system of PLC and DCS is developing very fast, PLC andDCS has become the development trend of industrial control system because of mutual penetration, integration and competition.