Network Construction Based on Fieldbus Technology

Abstract: Network construction information based on fieldbus technology is provided to you by excellent flowmeter and flowmeter production and quotation manufacturers. 1. Introduction At present, combining the original independent process control, MIS system and Internet to form an enterprise integrated information network is the development direction of enterprise integrated automation. On the basis of new technologies and products such as fieldbus, how to control the system. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the network construction article based on fieldbus technology. 1. Introduction At present, combining the original independent process control, MIS system and Internet to form an enterprise integrated information network is the development direction of enterprise integrated automation. On the basis of new technologies and products such as fieldbus, how to connect the control system with the management information network to build a comprehensive enterprise information network? This is a problem faced by many units. The author proposes a solution for this. Second, the representative process control system At present, among the process control systems in operation, the representative one is the system established in the late 1980s and early 1990s. At this stage, with the popularization of computer applications, the improvement of industrial control computer technology and product performance, and the emergence of a large number of intelligent control instruments, many enterprises in my country have established production processes using computer industrial control technology and advanced sensing technology. Automatic Control System. These systems have the following characteristics: 1. System structure The system adopts the distributed control of multiple lower computers, and the upper computer conducts centralized management of the lower computers. 2. System equipment ① The upper computer is a 286-level industrial control computer, and the lower computer is an STD bus 8088-level industrial computer. Except for the CPU system board, display board, and disk drive board, digital templates, Analog template, pulse template, switch template. In the case of a small amount of control, the lower computer can use the ISA bus industrial computer. ②The monitoring and execution equipment depends on the actual situation. For example, the measurement and control object is liquid, and it requires on-line measurement, explosion-proof, anti-corrosion, sanitation and other characteristics. Generally, mass flow meters, density meters, electromagnetic flow meters, liquid level meters, turbine flow meters, temperature sensors and transmitters, and pressure gauge sensors are used. And transmitters and other instruments, switch, adjustment controller. ③The communication between the upper computer and the lower computer adopts BITBUS mode. 3. Current related technologies In recent years, the development of computer technology, network technology and communication technology has greatly promoted the development of industrial process control technology. 1. Industrial control computer technology. The processor of the industrial control computer has developed from 286 and 386 to PII, and is divided into three types from the system bus: ISA bus, STD bus, and PCI bus. ①ISA bus industrial computer. The ISA bus used by this type of computer is exactly the same as that of an ordinary PC computer. In order to adapt to the harsh environment, special treatment has been done on the structure, and it is equipped with boards required for industrial control. PC general boards can be used. The operating system of this machine with limited expansion slots is exactly the same as that of PC computers. This type of model has a tendency to be replaced by PCI models. ②STD bus industrial computer. The STD bus computer is a combined, modular, miniaturized and standardized architecture, and the CPU board itself is a template. This kind of machine is small in size and generally adopts an embedded structure. It is very easy to expand and combine, but it needs to use a special board for STD bus. The current processor is up to 586 level. ③PCI bus industrial computer. The PCI bus has now become the bus standard for high-performance PC computers. The bus width is large, the transmission rate is high, and the independence of the PCI bus from the CPU makes it very compatible. At present, the PCI bus has been applied to the industrial computer, and the corresponding technical specifications have been formulated—CompactPCI specification. This kind of computer can rely on the resources of the PC on the board, software and development tools, and has strong network functions, graphics processing capabilities and data storage capabilities. 2. Data communication and network technology ①RS-232-C and RS-422 communication bus are used in process control. In practical applications, the two buses are connected with the secondary meter (transmitter) of the measuring instrument to realize data communication. The direct transmission distance and transmission rate of RS-422 are better than that of RS-232-C. However, because computers generally provide RS-232-C interfaces, RS-232-C is more widely used than RS-422. ②The transmission rate of BITBUS communication bus is 62.5KB/S when the transmission distance is 1200M, and the transmission rate is 375KB/S when the transmission distance is 300M, and 250 nodes can be connected. Software development based on this bus is easier than RS-232-C and RS-422 buses. ISA bus, STD bus, PCI bus all provide BITBUS interface board. Therefore, BITBUS is widely used in data communication between computers in process control systems. 3. Monitoring and execution equipment. This is the equipment at both ends of the control system, that is, information acquisition and instruction execution equipment.

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