Can the hottest Ethernet and Fieldbus coexist

  • Detail

Can Ethernet and Fieldbus coexist

for the global communication industry, a very important trend is the integration of different communication networks. Similarly, in the field of automation, there have been many discussions about whether Ethernet will replace Fieldbus in the past two years. Ethernet has been widely used in the world for many years. It is a mature communication standard, mainly used for commercial data processing. After entering the field of industrial automation, its application is mainly to solve the tasks of management layer, production command layer and control layer

in fact, in the United States, there have been many examples of industrial Ethernet used for IO control, that is, frequency converters and remote IO stations are all connected by industrial Ethernet, replacing the existing fieldbus. However, the vast majority of industrial Ethernet Applications in China are only used to connect PLC and HMI. Therefore, there has been a lively discussion about Ethernet replacing Fieldbus in China in the past two years

Industrial Ethernet and related product equipment are playing an important role in today's automation technology. With the emergence and development of switched network communication technology, industrial Ethernet technology is gradually entering industrial applications. Moreover, although the technologies and applications such as switch, redundancy self-healing, anti-interference and Gigabit continue to develop, industrial Ethernet has gradually met the conditions for downward extension from 2:00 p.m. on the 19th. Many new controllers provide ethernettcp/ip interfaces, and the current applications have been extended from the management layer to the control layer. However, the field i/o layer (sensors and actuators) below the control layer has not yet formed a large-scale application

at present, the production process automation and the purchase, inventory management and financial management in front of the enterprise adopt two systems, namely, fieldbus and ERP. These two systems must be able to communicate with each other in order to play a control role. However, the combination of ERP and Fieldbus has costs, because their data formats are different, and the data running environment is also different. The top is the windows environment of the management layer, and the bottom is the programmable NC environment. It is undeniable that under this premise, from a technical point of view, it is a very ideal scheme to extend the mature Ethernet applications that have been used in the industrial field down to the automation layer as the next generation fieldbus

like Intel's unremitting efforts to improve chip performance, Siemens and other international automation giants are also promoting the development of automation technology. The industrial Ethernet bus standard PROFINET popularized by PROFIBUS international organization conforms to this market trend

profinet is a modern concept of distributed automation standard; It is based on Ethernet and integrates existing fieldbus systems (especially PROFIBUS systems) simply and without any change. This is a very important aspect for meeting the consistency requirements from the company management level to the site level. Its significant contribution is to protect the user's investment, because the components of the existing system can still be merged into the PROFINET system without any change

of course, when selecting equipment and systems, most manufacturers will still give priority to the device level bus, because it is easy to use and cheap. There are many options, which is also one of the obstacles for Ethernet to enter the site. Fieldbus has been applied for more than 20 years. From the initial simple con bus to the current 8 different international standards, it can basically cover the production control needs of different industries

moreover, in terms of functions, the production system is extremely complex, and the automation needs of different industries and the same industry vary greatly. For example, in the process industry, the general production line speed is very slow, and the Ethernet data transmission capacity of tens of megabytes is not superior here. For the machinery manufacturing industry, real-time control is very important. At present, Ethernet can only be solved in the application layer, but it is not easy in the physical layer. If it is hard to implement, the cost will rise again

in addition, there are still some technical problems when the Ethernet enters the automation layer. For example, the original bus is two lines, which can transmit both power and data. Now the Ethernet is four lines, two power and two data

in addition, there are security problems. How to prevent hackers' intrusion? It is difficult to solve these problems without changing the nature of ether

therefore, it is impossible for Ethernet to completely replace fieldbus, and Fieldbus must have its own living space in the automation field with small error. Moreover, for China, the most important thing is not to replace Fieldbus with Ethernet, but to apply and promote the bus. In recent years, I have been to many ERP factories, but have I really achieved the planned operation level? Basically not. Why? Without the completion of production line automation and the following information, it is impossible to optimize the use of equipment and human resources. Because people ask for leave and equipment malfunctions, you can't predict them. This can't be done. It's hard to say that informatization has better promoted industrialization. So automation is a good carrier of informatization. Without automation facilities, informatization is difficult to implement; Without automation, how can you improve your productivity and production cycle? (end)

Copyright © 2011 JIN SHI