Ethernet (Ethernet) technology supports almost all network protocols, so it is widely used in data information networks. It has the advantages of high transmission speed, low energy consumption, easy installation, good compatibility, high openness and many supporting devices. In recent years, with the development of network technology and the increasingly high requirements for network performance in the field of industrial control, Ethernet is gradually entering the field of industrial control, forming a new type of Ethernet control network technology. The openness of Industrial Ethernet has unparalleled advantages in the seamless integration of industrial control networks and enterprise information networks. Ethernet has the advantages of high transmission speed, low consumption, easy installation and good compatibility. Because it supports almost all popular network protocols, it is widely used in commercial systems. In recent years, with the development of network technology, Ethernet has entered the field of control, 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. Open and transparent communication protocols are an inevitable requirement. Ethernet technology is introduced into the field of industrial control, and its technical advantages are very obvious: 1Ethernet is a fully open and fully digital network, and devices of different manufacturers that comply with the network protocol can be easily interconnected; 2Ethernet can realize the industrial control network and enterprise information network. Seamless connection to form a fully open network of enterprise-level management and control integration, as shown in Figure 2; 3 The cost of software and hardware is low. Because Ethernet technology is very mature, the hardware and software supporting Ethernet are highly valued and widely supported by manufacturers. There are a variety of software development environments and hardware equipment for users to choose; 4 high communication rate, with the expansion of enterprise information systems and the increase in complexity, the demand for information is also increasing, and sometimes even audio and video data are required At present, the fast Ethernet with the communication rate of 10M and 100M has been widely used. The Gigabit Ethernet technology is gradually mature, and 10G Ethernet is also being studied. Its rate is much faster than the current fieldbus. 5 The potential for sustainable development is great. In this era of rapidly changing information, the survival and development of enterprises will rely heavily on a fast and effective communication management network. The development of information technology and communication technology will be more rapid and more mature. This ensures that the Ethernet technology continues to develop continuously. Ethernet enters the field of industrial control, there are also some problems, the main ones of which are: 1 Real-time problem: The CSMA / CD medium access control method adopted by Ethernet is essentially non-real-time. Multiple nodes on a bus compete for the bus equally, waiting for the bus to be idle. This method is difficult to meet the real-time requirements in the field of industrial control. This is also the technical bottleneck of Ethernet technology entering the field of industrial control; 2 Adaptability and reliability to the industrial environment: Ethernet is designed according to the office environment, and it is necessary to make the anti-interference ability and appearance design meet the requirements of the industrial site. 3 Applicable to the application layer protocol of industrial automation control, the data structure and other characteristics defined by the application layer protocol defined in the current information network are not suitable for real-time communication between field devices in the field of industrial process control. Therefore, a unified application layer specification needs to be defined. 4 Intrinsic safety and network security: If industrial Ethernet is used in a flammable and explosive hazardous workplace, intrinsic safety must be considered. In addition, since Industrial Ethernet uses the TCP / IP protocol, it may be subject to network security threats including viruses, hackers' illegal intrusions and illegal operations. 5QOS (Quality of Service) problem: With the advancement of technology, the signals at the bottom of the factory control are no longer limited to pure digital and analog quantities, but include Audio and low-resolution Video signals. And different content requirements to ensure timely real-time. With the continuous development of network technology, the above problems have been completely or partially solved. 1 In recent years, the fast switching Ethernet technology has emerged. Using full-duplex communication, you can completely avoid collisions in CSMA / CD, and you can easily implement a priority mechanism to ensure the maximum utilization of network bandwidth and the best real-time performance. It completely avoids the possible low efficiency of CSMA / CD, master-slave, token, etc .; 2 for network equipment manufacturers in different industrial environments have adopted special anti-interference measures to make them more in line with industrial needs; 3 users in the application layer protocol You can increase or decrease the TCP / IP protocol stack according to your needs. In addition, you need to develop a network protocol that more conforms to industrial requirements; 4 equipment manufacturers provide devices that adapt to industrial environments, use Ethernet devices with good sealing, ruggedness, and vibration resistance. Connections are used to solve intrinsic safety issues; user passwords, data encryption, firewalls, and other security mechanisms are used to strengthen network security management, but solutions for industrial automation control network security issues need to be carefully studied; The improvement and the further improvement of the network protocol have also solved the QOS problem. Compared with other control systems, the industrial Ethernet control system has great advantages and can be applied to various industrial control fields. With the further development of integrated circuit, industrial Ethernet and embedded Internet technologies, the era of Ethernet-based industrial control networks will soon come and become the most open industrial control network architecture. This new type of network system echoes the development of the fieldbus in Ethernet and is a change to the traditional industrial control network, which will surely bring a new world to the field of industrial control. However, in certain areas such as automotive control systems, numerically controlled machine tools, etc., due to their harsh working conditions, high real-time performance, and high reliability requirements, they are not suitable for industrial Ethernet. From the current trend, there is no doubt that Industrial Ethernet has entered the field control level. But at least for now, it is difficult to completely replace the fieldbus as a single standard for real-time control communication. The existing fieldbus will continue to exist for a long period of time. The most likely situation is to develop a hybrid control system with multiple networks coexisting. Static Frequency Connerter With Singlephase Output 50Hz To 60Hz Converter,50Hz To 60Hz Frequency Converter,Single Phase Frequency Converter,Frequency Converter 50Hz To 60Hz Single Phase Jinan Xinyuhua Energy Technology Co.,Ltd , https://www.xyhenergy.com