Based on the fieldbus network construction

Abstract: based on the fieldbus network information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. One, the introduction at present, the original independent process control, the MIS system and Internet combine together to form the enterprise integrated information network, this is the development direction of enterprise integrated automation. In field bus, on the basis of new technologies and products, such as how to control system. More flow meter manufacturers choose model price quote you are welcome to inquire, the following article is based on the fieldbus network construction details. One, the introduction at present, the original independent process control, the MIS system and Internet combine together to form the enterprise integrated information network, this is the development direction of enterprise integrated automation. In field bus, on the basis of new technologies and products, such as how to control system and management information network, build enterprise integrated information network? This is a lot of units are faced with the problem. The author puts forward the solution to this. Second, the representative of the process control system at present, the running process control system, the representative is to establish the system of the late 80 s and early '90 s. This stage, with the popularity of computer applications, industrial control computer technology and the improvement of the performance of the product, the intelligent control instrument, many businesses have set up our country adopts industrial control computer technology and the advanced sensing technology in the production process automatic control system. The system has the following characteristics: 1, the system structure distributed control system adopts many audience a machine, a machine for centralized management of the upper to lower. 2, system equipment (1) PC for level 286 industrial control computer, the machine for grade 8088 STD bus industrial control, in addition to the CPU of the system board, display panel, disk drive, according to the needs of the control equipment selection, analog digital quantity template template template, switch amount, pulse template. Under the control of quantity is little, a machine can use the ISA bus industrial computer. (2) monitoring, the executive equipment by the actual situation. Such as measurement and control object is a liquid, and demanded that the online survey, explosion-proof, anti-corrosion, health and other characteristics, generally USES the mass flowmeter, density meter, electromagnetic flow meter, liquid level meter, turbine flow meter, temperature sensor and transmitter, pressure gauge sensor and transmitter instrument, such as switch, adjust volume controller. (3) between upper machine and lower machine adopt BITBUS way to communicate. Three, the current related technology in recent years, the development of computer technology, network technology, communication technology has greatly promoted the development of the industrial process control technology. 1, industrial control computer technology. From 286, 386, the development of industrial control computer processor by P Ⅱ, from the system bus is divided into: the ISA bus, STD bus, PCI bus three categories. (1) the ISA bus industrial control computer. This kind of computer is the ISA bus is exactly the same with ordinary PC computer. In order to adapt to bad environment, made a special processing in the structure, equipped with industrial control required for the board, can use general PC boards, this kind of expansion slot machine co. , the same operating system and PC computer. This model has a tendency to replaced by PCI models. (2) the STD bus industrial control computer. STD bus computer is a combination of modular, miniaturization, standardization, system structure, the CPU board itself is a template. This machine volume is small and exquisite, generally USES the embedded structure, extension, combination is very easy, but you need to use the special card by STD bus. Currently the processor zui to 586 levels. (3) the PCI bus industrial control computer. PCI bus has become a high performance PC bus standard. Bus width is big, high transmission rate, PCI bus has nothing to do with the CPU makes it has very good compatibility. Has been applied to PCI bus industrial control computer, and formulated the corresponding technical specification & ndash; CompactPCI specification. The computers may be on the board, software and development tools with the help of the PC resource, have very strong network function, graphics processing power and data storage capacity. 2 (1) RS -, data communication and network technology 232 - - C and RS 422 communication bus are used in process control. In the practical application by the two bus and secondary table (measuring instrument Transmitter) To realize data communication. RS - 422 direct transfer distance and transfer rate than RS - 232 - C. However, due to generally provide RS - computer 232 - C interface, so RS - 232 - C - than RS 422 is used more widely. (2) the BITBUS communication bus when the transmission distance of 1200 m, the transfer rate of 62. 5 KB/S, when the transmission distance of 300 m, the transfer rate of 375 KB/S, 250 nodes can be connected. In the bus on the basis of relative RS - software development 232 - - C and RS Easy to 422 bus. The ISA bus, STD bus, PCI bus provide BITBUS interface board. So, BITBUS are widely used in the data communication between the computer process control system. 3, monitor, and perform equipment. This is the ends of the equipment control system, the information gain and the instruction execution equipment. The general trend is towards digital, intelligent direction, especially since the rise of fieldbus more to speed up the development. Four, building integrated information network in the first place, our goal is: the original independent control net, the process of enterprise management interest network combined together to form the enterprise integrated information network. On the premise of achieve the goal, in addition to the advanced nature of the guarantee system should also guarantee the openness of the system.
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