The introduction of Ethernet will provide the possibility for the subsequent development of the control system. Users do not need to invest in the technical upgrading alone. For this, any existing field bus technology is incomparable. At the same time, the development of robot technology and intelligent technology requires that communication networks have higher bandwidth and performance control engineering network copyright, and communication protocols have higher flexibility. Ethernet can meet these requirements well.

Although industrial Ethernet has really achieved one network in some industries, for other industries, field bus and industrial Ethernet will coexist for many years. Fieldbus and industrial Ethernet are two widely used technologies in current industrial control applications. Although a variety of field bus technologies are incompatible with each other, controllers of different companies cannot realize high-speed real-time data transmission, and there are protocol gaps in information networks, which lead to "isolated islands of automation" and other problems. However, in the control network, the rapid recovery of network failures, intrinsic safety and other issues are still the main obstacles restricting the comprehensive application of Ethernet. Therefore, Fieldbus technology is still widely used in the device layer, while industrial Ethernet applications are mainly concentrated between the manufacturing execution layer and the device layer. This not only reduces the user's investment risk, but also protects the user's existing equipment and technology investment. It can be predicted that the mixed state of field bus and industrial Ethernet will last for a long time. However, it is certain that Ethernet has become an irreversible "presence" on the industrial scene. From the current development of international and domestic industrial Ethernet technology, industrial Ethernet has been widely used in the manufacturing execution layer and has become the de facto standard. In the future, industrial Ethernet will play a more and more important role in the interconnection and information integration of field devices in the industrial enterprise integrated automation system.

Fieldbus technology is difficult to form a unified standard, which greatly affects its popularization and application. In addition, a single field bus obviously cannot complete the complex information management function CONTROL ENGINEERING China, which makes its integration with the information network very natural. Traditional commercial Ethernet is the most widely used communication technology today, with many advantages. However, Ethernet is considered as a "non deterministic" network, which cannot meet the real-time requirements and the harsh environment requirements of industrial sites. With the development of industrial Ethernet, communication certainty and real-time, stability and reliability, security, bus power supply and other issues are being solved in industrial Ethernet. It is generally believed that industrial Ethernet is the best solution for the future control network and has broad prospects for development. However, at present, industrial Ethernet will use special industrial Ethernet switches, communication modules and other expensive equipment, which will affect the promotion and application of industrial Ethernet. Therefore, it is a more realistic solution to mix Fieldbus and Industrial Ethernet as Ethernet subnet and Ethernet as the parent network of Fieldbus. And it will last for a long time.