Principles of Industrial Ethernet
The principle of industrial Ethernet can be divided into the following aspects:
Physical Layer: The physical layer interfaces used for Industrial Ethernet are mainly twisted pair and fiber optic, of which twisted pair is the most commonly used interface. Twisted pairs are used to meet different industrial control requirements through different transmission rates (e.g. 10Mbps, 100Mbps, 1Gbps, 10Gbps, etc.).
Data Link Layer: The data link layer of industrial Ethernet mainly adopts Ethernet protocol, but some functions required for industrial control have been added on this basis, such as frame synchronization mechanism, flow control mechanism, real-time mechanism, etc. Among them, the frame synchronization mechanism can ensure the data arrival order, the flow control mechanism can control the data transmission rate, and the real-time mechanism can ensure the real-time and reliability of the data.
Network Layer: The network layer of industrial Ethernet mainly adopts TCP/IP protocol, which realizes network division and management through IP address and subnet mask. In addition, Industrial Ethernet also supports a variety of real-time communication protocols (such as PROFINET, EtherCAT, etc.) to meet different application requirements.
Application Layer: The application layer of Industrial Ethernet mainly includes industrial control protocols (e.g. Modbus, CANopen, etc.) and Web services (e.g. HTTP, FTP, etc.) to support applications such as industrial control and data transmission. Overall, the principle of Industrial Ethernet is to realize efficient, real-time and reliable transmission of industrial control data through different protocols and mechanisms to meet the automated production and control needs of industrial sites.
Features of Industrial Ethernet
Industrial Ethernet has the following characteristics:
High-speed transmission: Industrial Ethernet adopts high-speed transmission technology, and the data transmission speed can reach 10Mbps, 100Mbps or 1000Mbps, which is faster than traditional industrial communication protocols.
Real-time: Industrial Ethernet supports real-time data transmission, which can meet the real-time requirements in the field of industrial control and automation, such as robot control and process control.
High reliability: Industrial Ethernet adopts redundancy mechanism and self-healing ability, which can ensure the reliability and continuity of data transmission, and at the same time, it can automatically detect and recover from faults, so as to improve the reliability and stability of the system.
Easy Expansion: Industrial Ethernet can support different types of equipment and systems to be connected in the same network to realize interconnection of equipment and information sharing, and at the same time, it can flexibly expand the network scale and topology to meet the needs of different application scenarios.
Interconnection: Industrial Ethernet can be interconnected with other networks, such as Internet, LAN, etc., to realize data sharing and communication between different regions and departments.
Security: Industrial Ethernet supports security protocols and encryption mechanisms, which can protect the security and confidentiality of data transmission and prevent hacker attacks and data leakage. In summary, Industrial Ethernet is characterized by high-speed transmission, real-time, high reliability, easy expansion, interconnectivity and security, and is suitable for data transmission and communication in industrial control and automation fields.
Problems to be solved by Industrial Ethernet
The problems to be solved by industrial Ethernet mainly include the following aspects:
Real-time problem: The control system in the industrial field needs to collect and process a large amount of data in real time, so it is necessary to solve the problem of network real-time to ensure the rapid transmission and processing of data.
Reliability issues: the control system in the industrial field has very high reliability requirements for the network, because the failure of the network may lead to the entire production line or factory shutdown, resulting in huge economic losses, so it is necessary to design a highly reliable network architecture and technology.
Security issues: the control system in the industrial field involves a lot of critical data, such as production plans, process parameters, etc., so it is necessary to take strict security measures to prevent data leakage, tampering or damage.
Interoperability: The control system in the industrial field consists of many different devices and systems, so it is necessary to realize the interoperability between the devices and systems, so that they can communicate with each other and collaborate to achieve more efficient production and control. Overall, the problem of industrial Ethernet is how to realize efficient transmission and processing of industrial field data under the premise of high real-time, high reliability, high security and high interoperability to meet the needs of industrial production and control.