Advantages, Disadvantages and Applications of Industrial Ethernet and Fieldbus Technology
With the development of the "Industry 4.0" strategy, the development of computer technology, communication technology, and IT technology has penetrated into the industrial control field. The most important performances are industrial fieldbus technology and industrial Ethernet technology. Among them, the extensive use of industrial fieldbus technology, especially Ethernet technology, has brought profound changes to automation technology. Fieldbus-based communication networks for digital, two-way transmission, and multi-branch construction at the production site, connecting intelligent field devices and automated measurement and control systems. It is an industrial data bus and is the underlying data communication network in the field of automation. 1. Fieldbus control system Its software is an important part of the system. The software of the control system includes configuration software, maintenance software, simulation software, equipment software and monitoring software. First choose to develop the configuration software, control the operating human interface software MMI. Through the configuration software, the connection between the function blocks is completed, the function block parameters are selected, and the network configuration is performed. During the operation of the network, the system collects data in real time, performs data processing and calculation. Optimize control and logic to control alarms, monitors, displays, reports, and more. 2. The fieldbus measurement system is characterized by multi-variable high-performance measurement, which makes the measuring instrument have more functions such as computing power. Because of the digital signal, it has high resolution, high accuracy, anti-interference and strong anti-distortion ability. At the same time, it also has status information of the instrumentation equipment, which can adjust the processing. 3. Equipment management system It can provide diagnostic information, management information, equipment operating status information (including smart meters) and equipment manufacturing information provided by the manufacturer. 4. Bus System Computer Service Module The client/server mode is currently the more popular network computer service mode. The server represents the data source (provider) and the application client represents the data consumer, which takes the data from the data source and processes it further. The room machine runs on a PC or workstation. The server runs on a minicomputer or mainframe, and it uses both intelligence, resources, and data to complete the task. 5. Database It can organize and dynamically store a large amount of relevant data and applications, realize full sharing and cross-access of data, and has high independence. The parameters of industrial equipment change continuously during operation, the amount of data is large, and the real-time requirements of operation and control are very high. Therefore, a system that can communicate with each other and distribute real-time data is formed. 6. Network system hardware and software Network system hardware: system management host, server, gateway, protocol converter, hub, user computer and other low-level intelligent instrument network system software: NetWarc, LAN Mangger, Vines At present, there are more than forty kinds of fieldbuses in the world. These fieldbuses are mostly used in process automation, medicine, processing, transportation, defense, aerospace, agriculture and buildings. The current industrial bus network can be classified into three. Class: 485 network, HART network, FieldBUS field bus network. 485 network: RS485/MODBUS is a popular industrial networking mode, which is characterized by simple and convenient implementation, and now there are many instruments supporting RS485. Now the instrument manufacturers have turned to support RS485/MODBUS for the simple reason that the RS485 conversion interface is not only cheap but also a wide variety. At least in the low-end market, RS485/MODBUS will remain the most important industrial networking method. HART Network: HART is an excessive bus standard proposed by Emerson. The main feature is that the digital signal is superimposed on the 4-20 mA current signal, but the protocol is not really open. To join his foundation, the agreement can be obtained. And joining the foundation requires a certain fee. HART technology is mainly monopolized by several large foreign companies. In recent years, there are also companies in China, but they have not yet reached the level of foreign companies. There are now many smart meters with [HART round card] that support HART communication. However, from the domestic situation, we have not really used this part of the function to monitor the device network. At most, we only use the handheld device to set parameters. In the long run, due to the low HART communication rate and difficult networking, the application of HART instruments will decline. FieldBus Fieldbus Network: Fieldbus is one of the hotspot technologies in today's automation field, and is known as the computer LAN in the field of automation. Its emergence marks the beginning of a new era of automation control technology. The fieldbus is a network that connects digital, serial, and multi-station communication devices that control the field and control devices in the control room. Its key symbol is to support two-way, multi-node, bus-based all-digital communication. In recent years, fieldbus technology has become a hotspot in the development of automation and instrumentation in the world. Its emergence has revolutionized the structure of traditional control systems, making the automatic control system "smart, digital, information, networked, and dispersed." In the direction of further development, a new distributed control system for network communication, Fieldbus Control System (FCS), is formed. However, so far, fieldbus has not formed a truly unified standard, ProfiBus, CANbus, CC-Link and other standards exist in parallel, and have their own living space. When is the reunification, nowhere in sight. At present, the types of instruments supporting the field bus are still relatively small, the room for selection is small, the price is high, and the amount is small. Our
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