DCS和PLC区别总结的比较好的一篇文章.docx

1、DCS和PLC区别总结的比较好的一篇文章The Difference BetweenDCS and PLCIn the power plant automation in thermal field, DCS and PLC is two completely different and have something to the concept of contact. DCS and PLC is computer technology and industrial control technology, the combination of the power of the main en

2、gine control system, and is with DCS PLC is mainly applied in the power plant auxiliary workshop. DCS and PLC has operator station provides the means of human-computer interaction, rely on the controller based on computer technology to complete control operation, all through the I/O card finished an

3、d a component and execution of the device data exchange, has called network communications system. DCS and PLC so similar, why there is a completely different concept in engineering practice, we how to choose? This paper, from the historical evolution, technical features, development direction and s

4、o on several aspects are reviewed in this paper, the hope can be reference for the thermal professionals. The DCS in NETWORK6000 + as an example, the paper tries to detailed clear examples. 1 The history and core concept of DCS and PLCDCS for DISTRIBUTED CONTROL SYSTEM. Refers to the dangerous scatt

5、ered and data set. 70 s to enter the market, complete the analog control with PID operation, instead of the simulation mainly control instrument. First proposed a kind of such thoughts of DCS instrument manufacturers, at that time is mainly used in chemical industry. And in the 60 s PLC successfully

6、 developed, called the Logic operation of the PLC (Programmable Controller), based as PLC. Mainly is used in automobile manufacturing. DCS and design principle of large difference with PLC, PLC touch the relay copy from the control principle of the rise and development of the 70 s, only the switch q

7、uantity logic control of PLC. Its to store to perform the logic operation, sequence control, timing, counting and operation of the operation instructions; And through the digital input and output operation, to control all kinds of mechanical or production process. Users of the production process con

8、trol program to express the process requirement. Will it in the PLC program memory, the runtime users according to store the content of the program execution to complete ideally suited to process the required action. DCS operational amplifier is in on the basis of the development of may. Put all the

9、 function, the relationship between the various process variables are successful design can block. In the mid 70s,the DCS only analog control. DCS and PLC controller is the main difference in the switch quantity and analog computing, even if later both mutual some penetration, but there are still di

10、fferences. Since the 80 s, PLC logical operations outside, also in addition to adding some control circuit algorithm, but to complete some complex operation or more difficult with ladder-diagram programming, PLC, analog computing when programming in not too, intuitive, and programming is more troubl

11、esome. But in the solution in logic, show the advantages of fast. And DCS use function of packaging simulation calculation and logic operations, whether logic operation or complex simulation of operation forms of expression are very clear, but relatively PLC for the expression of the logical operati

12、on efficiency is low. DCS and PLC in the historical evolution differences is obvious, their subsequent had a great influence. However, the greatest impact on subsequent development, and not the difference in origin technology, but its origin, the difference between the concept. DCS of the core conce

13、pts of the danger is scattered data set, the computer control system, therefore the development of DCS, which is in the process of continuous use of computer technology, the communication technology and the latest achievements of control technology, to set up a complete system of the distributed con

14、trol, DCS offer users is a complete for industrial control of the safety and security of highly efficient and flexible solutions. And the core concepts of PLC programmable controller is, the purpose is used to replace relays, executing logic and time apart and control functions, establish the order

15、of flexible program control device. So, PLC of the development of the main line is constantly improve the ability index, to users with a perfect function of flexible control device. DCS, PLC is a system is a device, this is both in the fundamental difference between the concept. This difference was

16、the impact of the deep, it into the technology every aspect of the economy. 2 DCS and PLC technology characteristics and mutual infiltration Different conceptual basis, different path makes DCS and PLC have different technical characteristics, and the development of technology is not closed, learn from each other mutual infiltration has always throughout the development process. 2.1, control processing power We know, a PLC controller, often can deal with thousands o