Abstract: Industrial Ethernet control systems are a new type of industrial control system that emerged after Distributed Control Systems (DCS) and Fieldbus Control Systems (FCS). This paper briefly introduces the characteristics of industrial Ethernet, discusses in detail the current application status of industrial Ethernet in the control field and the development trend of Ethernet switching technology, and proposes the view that Ethernet can achieve seamless connection between industrial control networks and enterprise information networks, forming a fully open network for integrated enterprise-level management and control. Sensor technology, communication technology, and computer technology are the three foundations of modern information technology. With the rapid development of IT technology and the continuous improvement of industrial automation requirements, the workload of industrial control networks is becoming increasingly heavy. Unlike data information networks, the industrial control field requires a high-speed, low-cost, real-time, open, stable, and accurate network. Ethernet technology supports almost all network protocols, so it is widely used in data information networks, with advantages such as high transmission speed, low power consumption, easy installation, good compatibility, high openness, and support for various devices. The openness of industrial Ethernet gives it an unparalleled advantage in the seamless integration of industrial control networks and enterprise information networks. Keywords: Industrial Ethernet; characteristics; trends; fully open network I. Characteristics of Industrial Ethernet Technology Ethernet technology has advantages such as low cost, stability and reliability, high communication speed, abundant software and hardware products, wide application, and mature supporting technologies, making it one of the most popular communication networks. In recent years, with the development of network technology, Ethernet has entered the control field, forming a new type of Ethernet control network technology. This is mainly due to the development of industrial automation systems towards distributed and intelligent control, making open and transparent communication protocols a necessary requirement. The introduction of Ethernet technology into the industrial control field has very obvious technical advantages: (I) Ethernet is a fully open and fully digital network, and devices from different manufacturers can easily interconnect according to network protocols. (II) Ethernet can achieve seamless connection between industrial control networks and enterprise information networks, forming a fully open network integrating enterprise-level management and control. (III) Low software and hardware costs. Because Ethernet technology is very mature, software and hardware supporting Ethernet are highly valued and widely supported by manufacturers, with a variety of software development environments and hardware devices available for users to choose from. (iv) High communication speed. As the scale and complexity of enterprise information systems expand, the demand for information is also increasing, sometimes even requiring the transmission of audio and video data. Currently, 10M and 100M Fast Ethernet are widely used, Gigabit Ethernet technology is gradually maturing, and 10G Ethernet is under research. Its speed is much faster than the current fieldbus. (v) Great potential for sustainable development. In this era of rapid information change, the survival and development of enterprises will largely depend on a fast and effective communication management network. The development of information technology and communication technology will be faster and more mature, thus ensuring the continuous development of Ethernet technology. II. Current Status of Industrial Ethernet Applications in the Control Field Compared with fieldbus, industrial Ethernet provides an open standard, enabling enterprises to achieve comprehensive and seamless information integration from field control to management level. It solves the problem of "automation islands" caused by different protocols. However, from the current development perspective, the application of industrial Ethernet in the control field is mainly reflected in the following forms. (i) Hybrid Ethernet/Fieldbus network structure This structure is actually a typical integration form of information network and control network. Ethernet is gradually developing towards the field device level and is trying to integrate with other network forms. However, Ethernet and TCP/IP were not originally designed for the control field and are not mature in many aspects such as architecture, protocol rules, physical media, data, software, and experimental environment. Fieldbus can fully meet the basic requirements of modern enterprises for the underlying control network and realize a truly fully distributed system. Therefore, Ethernet is used at the enterprise information layer and fieldbus is used at the underlying device level, and information exchange between the two is realized through a communication controller. (II) How to use industrial Ethernet as a separate control network is one of the development directions of industrial Ethernet and one of the research hotspots in the field of industrial control. For example, JetWeb, the new generation control system of Jetter AG in Germany, is an industrial automation control system that integrates fieldbus technology, 100Mb/s Ethernet technology, CNC technology, PLC technology, visual human-machine interface technology and global production management technology. It also has wide compatibility and can be compatible with third-party automation control products. It proposes the concept that "the network is the controller" and is an industrial network structure that replaces all underlying fieldbuses. This kind of industrial control network runs through all layers of the network, making it a transparent application entity covering the entire enterprise. It achieves a seamless integration of office automation and industrial automation. Essentially, it's a single-layer, flat structure. Its excellent scalability and interconnectivity make it a truly unified, fully open network architecture. (III) Web-based Network Monitoring Platform Embedded Ethernet is a recent hot topic in network applications. It enables all network-connected devices to communicate with each other via the Internet, from computers, PDAs, and communication equipment to instruments and home appliances. Within an enterprise, the enterprise information network can be used to publish and display real-time factory operation data. Managers can use a web browser to remotely monitor on-site conditions, remotely debug equipment, and remotely diagnose and handle equipment faults. The simplest way to achieve this is to use an independent Ethernet controller, connecting a control host with a TCP/IP interface and field devices with RS-232 or RS-485 interfaces. The Ethernet controller acts as a bridge between the general computer network and various field devices. III. Development Trends of Ethernet Switching Technology The rapid advancement of Ethernet and communication technologies has spurred the further development of industrial Ethernet technology. Currently, it is widely used in the resource management layer and execution manufacturing layer of integrated automation systems in industrial enterprises, and shows a trend of extending downwards to be directly applied to industrial control sites. From the current development of industrial Ethernet technology both internationally and domestically, industrial Ethernet has been widely used in the manufacturing execution layer and has become a de facto standard. In the future, industrial Ethernet will play an increasingly important role in the interconnection and information integration between field devices in the integrated automation system of industrial enterprises. In general, the development trend of industrial Ethernet technology will be reflected in the following aspects: (I) Combination of industrial Ethernet with fieldbus. The research on industrial Ethernet technology has only attracted the attention of domestic and foreign industrial control experts in recent years. Fieldbus, after more than ten years of development, has become increasingly mature in technology and has begun to be fully promoted in the market, forming a certain market. At present, there are still some problems in completely replacing fieldbus. It is necessary to further study the new control system architecture based on industrial Ethernet and develop a series of products based on industrial Ethernet. (II) The direct application of industrial Ethernet technology to communication between industrial field devices has become an inevitable trend. With the improvement of Ethernet communication speed, full-duplex communication, and the development of switching technology, the technical foundation for the deterministic solution of Ethernet communication has been provided, thereby eliminating the main obstacle to the direct application of Ethernet to communication between industrial field devices and providing technical possibility for the direct application of Ethernet to communication between industrial field devices. To this end, the International Electrotechnical Commission (IEC) is drafting the Real-time Ethernet (RTE) standard, aiming to promote the comprehensive application of Ethernet technology in the field of industrial control. [b]References:[/b][1]Xu Aidong, Wang Hong, Yang Zhijia. Industrial control network based on Ethernet[J]. Information and Control, April 2000, Vol. 29, No. 2 [2]Jia Dongyao, Wang Renhuang. Development trend of industrial control network structure[J]. 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