Industrial Ethernet favored in the business sector

Industrial Ethernet is an Ethernet technology used in the field of industrial control. It is technically compatible with commercial Ethernet (that is, the IEEE802.3 standard), but actual products and applications are completely different. This mainly shows that when designing common commercial Ethernet products, it cannot meet the needs of industrial sites in material selection, product strength, suitability and real-time, interoperability, reliability, anti-interference, intrinsic safety, etc. . Therefore, industrial Ethernet is different from commercial Ethernet in industrial field control applications.

In the office and business area, Ethernet is the most popular and widely used communication technology today. It has low price, high communication speed and bandwidth, good compatibility, rich hardware and software resources, extensive technical support base and strong sustainable development potential. And many other advantages, it has now become a widely used network technology in the world, and it is rapidly expanding to various fields. However, Ethernet needs to solve some problems in order to enter the industrial control field. Ethernet adopts the carrier sense multiple access/collision (collision) detection (CSMA/CD) transmission specification, which cannot meet the real-time nature of industrial control. The requirements of sexuality, repeatability, etc.; In addition, the existing high-level agreement can not meet the requirements of industrial control.

Fieldbus technology was developed in the mid-1980s with the development of electronics, instrumentation, computer technology, and network technology. It connects intelligent field devices and automation systems to all-digital, two-way transmission, multi-branch structure communication control networks. It has made it possible for industrial control systems to become decentralized, networked, and intelligent. This has led to major changes in the architecture and functional structure of industrial control systems. Fieldbus technology quickly enters various fields with its distinctive features and advantages. The major foreign control equipment manufacturers have also developed different field buses one after another. At present, there are dozens of field buses that are commonly used, but it is difficult for these field buses to form a unified standard. Therefore, it has greatly influenced the popularization and application of fieldbus. In addition, the characteristics of the field bus in the network make it very natural to integrate with the information network. The plant-level information network system is almost always Ethernet, and the integration of the field bus and the information network can be realized through Ethernet. A single fieldbus obviously cannot meet this requirement.