About <br> Industrial Ethernet is a powerful area and cell network is based on IEEE 802.3 (Ethernet) is. With Industrial Ethernet, SIMATIC NET offers a seamless integration into the new multimedia world. A few years ago, when the battle of the fieldbus battle was on the rise, Ethernet, traditionally used for offices and businesses, quietly entered the control field. Ethernet has recently come to the forefront and has grown rapidly, attracting attention. The reason is that the industrial automation system is developing in the direction of forward distribution and intelligent real-time control. Among them, communication has become the key, and users are increasingly pressing for unified communications protocols and networks. On the other hand, the rapid development of information technology, such as Intranet/Internet, requires enterprises to achieve full seamless information integration from the field of control layer to management, and provide an open infrastructure, but the current field bus can not meet these requirements . It should be said that the emergence of fieldbus does bring a deep revolution to industrial automation, but a variety of fieldbuses are incompatible with each other. Different companies' controllers cannot realize high-speed real-time data transmission between each other. The information network exists on the agreement. The gap led to the emergence of "isolated islands" and prompted people to start looking for new outlets and pay attention to Ethernet. Ethernet has the following advantages: (1) has a fairly high data transmission rate (currently up to 100 Mb/s) and can provide sufficient bandwidth; As for the problem of Ethernet's uncertainty and poor real-time performance, it has basically been solved due to the use of smart hubs, the realization of active switching functions, the introduction of priority, and the wiring of duplex. By increasing the data transmission rate, carefully selecting the topology of the network and limiting the network load, the probability of data collisions can be minimized. In addition, Hirschmann has developed a series of rugged, hermetically sealed and vibration-resistant Ethernet devices suitable for industrial environments, such as DIN rail transceivers, hubs, switches, connectors, etc. Woodhead Connectivity has introduced a protection class of IP67 RJ-45 connection device. All these have created conditions for Ethernet to enter the real-time control field. Because of this, ARC (Automation Research Company) predicts that Ethernet and TCP/IP will become the basic protocol of device bus and field bus in the future. VDC (Venture Development Corp.) in its survey report released on March 19, 1999 predicted that in the field of industrial control applications, the global market share of Ethernet will jump from 8.4% in 1998 to 22% in 2003. The largest increase in the bus. At present, some international organizations in the world are engaged in the work of promoting Ethernet access control. For example, IEEE (Institute of Electrical and Electronics Engineers) is working on the development of new standards for fieldbus and Ethernet communications. This standard will enable the network to see "objects." IAONO (Industrial Automation Open Network Alliance) recently reached consensus with ODVA and IDA Group on jointly promoting Ethernet and TCP/IP. On March 17, 2000, ODVA (DeviceNet Vendor Association) released an industry standard for the use of Ethernet services at the factory floor. On March 29, 2000, the FF (Fieldbus Foundation) announced the final specification (FSI 1.0) for high-speed Ethernet (100Mb/s). Industrial Ethernet Association cooperates with ARC and Advisory Group in the United States to carry out research on key technologies of industrial Ethernet. The current development of 1000Mb/s Ethernet has entered a practical stage, although its price is still relatively expensive. From the above analysis, it can be seen that the entry of Ethernet into industrial control is a development trend that cannot be ignored. This article gives an overview of some of the recent advances in industrial Ethernet and discusses some of the future outlook. A progress in the application layer 1. Encapsulation <br> As we all know, Ethernet itself only provides a series of physical media definitions and a shared framework. The architecture includes the physical media, frame format, and addressing format of LAN device data, ie it only provides the physical layer and data link layer. Ethernet and TCP/IP include IP protocol (layer 3), TCP or UDP protocol (layer 4). When Ethernet is used for information technology, Layer 7 contains HTTP (hypertext transfer protocol) and FTP (file transfer protocol). ), SNMP (Simple Network Management Protocol), SMTP (Simple Email Transfer Protocol), and Telnet (telnet). But when it is used for industrial control, it is reflected in the seventh layer is real-time communication, objects for system configuration and application protocols for engineering models. Assembling these different concepts is called "encapsulation." TCP/IP supports the interconnection between heterogeneous networks based on heterogeneous operating systems. It is a true open system communication protocol and has become the de facto standard for interconnecting heterogeneous networks. "Encapsulation" is the embedding of message frames into a TCP or UDP container. Typical examples are Ethernet/IP developed by Rockwell Automation and ODVA, HSE (High Speed ​​Ethernet) developed by FF, and Modbus TCP/IP developed by Schneider Electric. Before all these protocol data are sent to the Ethernet, the fieldbus messages are essentially unchanged and embedded as "user data" into the TCP/IP frames, and are easily backward compatible with protocols based on the above buses. 2. Proxy server <br> Proxy server (Proxy) is similar to the gateway (Gate-way) for converting two different communication protocols, but its function is much stronger than the latter. The main goal of the proxy server is to integrate the standard fieldbus network into the industrial Ethernet network. The main advantage of the proxy server is that the existing fieldbus devices can still be used for a long time in the future, thus protecting the user's investment. Supporting this view is Profinet, published by Profibus International, which contains two concepts, namely the open, object-oriented runtime concept and engineering concepts that are independent of the manufacturer. The run-time concept is based on TCP/IP, UDP, RPC (Remote Program Call) and DCOM, and these basic mechanisms are enhanced and optimized so that it is suitable for applications with high real-time performance requirements. The engineering concept includes the establishment of an engineering object model, which not only enables users to develop through different manufacturer's configuration tools, but also uses facets to define manufacturers and application-specific extensions, thus supporting a single factory range. Integrate products from different manufacturers. 3. The real-time communication system IDA (Interface for Distributed Automation, for distributed automation interface) developed by the United States located in California NDDS real-time communication system of the fourth layer, is NDDS Publisher / Subscriber mode, provide a powerful wide range of applications service. Another important feature of IDA is Web-based device management. All field devices have their own web pages, including configuration, operation, and diagnostic parameters that users can access through a standard browser. The XML-based device description simplifies the configuration of the system and supports device interoperability and interchangeability. IDA is located on the seventh layer of Industrial Ethernet. It also defines communication from Layer 4 to Layer 7 and application interfaces (APIs), and even includes the application's standard programming interface. IDA Group announced its technical specifications at the 2001 Hannover Fair in Germany. The three networks are the controllers <br><br><br><br><br><br><br><br><br> The Jetter AG (Ludwisburg, Germany) recently released the Jetweb automation system with innovative ideas. It is a distributed intelligent control system based on 100Mb/s Ethernet and claims that "the network is the controller". Its characteristics are: (1) Similar to the Internet structure, no need for programming for real-time transmission of data, no need to consider the hierarchical structure of the network; (2) For the user, only one set of data and one program, all data in the network Just express once, the program and data can be reused, the network plays the role of a real server; (3) from the sensor to the factory management, there is only one Ethernet bus for direct communication; (4) can be connected to the Internet to achieve the entire factory Globalization networking; (5) Ethernet is both a system bus connected to various intelligent modules and a fieldbus connecting field devices. Internal and external communications are no different here. Hub technology is integrated in each controller. By separating the internal communications from the external communications by allocating an address space. Four Summary Horst Kohlbert, Network Product Manager at Siemens Energy & Automation, said: “Field devices embedded with Ethernet and embedded Internet servers will soon become a reality.†This prediction suggests that Industrial Ethernet is about to enter the field control level. However, judging from the current trend, the existing field bus will continue to exist and it is unlikely to withdraw from the stage of history. At the field level, industrial Ethernet can occupy a certain market, but whether it can be used as a single standard for real-time control of communications, it is difficult to make a final conclusion, and it is most likely to develop a hybrid control system. In addition, not every fieldbus will be replaced by an industrial Ethernet bus, such as AS-i, CAN, and these two fieldbuses are undoubtedly the best for use in 2-position I/O sensors/actuators ( AS-i transmits 4 bits of data and the bus is live; CAN transfers up to 8 bytes), as well as dedicated buses such as SERCOS (for CNC, motion axes, IEC 61491 international), Instabus (for buildings) ), which has its own specific application areas, are not suitable for industrial Ethernet. In addition, flammable, explosive (such as chemical, pharmaceutical), as well as harsh environmental conditions, high reliability applications are not suitable for the application of industrial Ethernet. In summary, the existing fieldbus has its own market position, and it will still maintain this status in the future, or be combined with industrial Ethernet. Fieldbus cannot be replaced by Industrial Ethernet, but the enormous potential for development of the latter must not be overlooked, and its field of application will continue to expand. Network Cables, Category: CAT5E ,CAT6,CAT7,UTP and STP network.Our network Environmental certification.The length can be customized .Welcome to our Company inquiry order. Rj45 Network Cable,Networking Cable,Cat6 Utp Cable,Long Ethernet Cable Dongguan Fangbei Electronic Co.,Ltd , https://www.connectorfb.com
The wide range of applications provided by intranets, extranets, and the Internet has not only entered today's office space, but can also be applied to production and process automation. Following the successful operation of 10M baud rate Ethernet, full-duplex and adaptive 100M baud rate Fast Ethernet (IEEE 802.3u compliant) have been successfully implemented for many years. Which kind of performance Ethernet uses depends on the user's needs. Universal compatibility allows users to seamlessly upgrade to new technologies.
Benefits for Users <br> Market share is as high as 80%. Ethernet is undoubtedly the number one network in LAN today. The superior performance of Ethernet brings great benefits to your application:
Quick assembly by simple connection.
· Provides continuous compatibility through constant development, thus ensuring the safety of investment.
• Provide virtually unlimited communications performance through switching technology.
Various networking applications, such as networking of office environments and production application environments.
·Access to WA
N (Wide Area Network) enables communication between companies, for example, ISDN or Internet access.
SIMATIC NET is based on field-proven technology. SIMATIC NET has supplied more than 400,000 nodes all over the world for harsh industrial environments, including areas with high levels of electromagnetic interference.
Composition of Industrial Ethernet Networks <br> A typical industrial Ethernet network environment has the following three types of network devices:
·Network components and connection components:
FC Quick Connect Socket ELS (Industrial Ethernet Electrical Switch)
ESM (Industrial Ethernet Electrical Switch)
SM (Industrial Ethernet Fiber Switch)
MC TP11 (Industrial Ethernet Fiber Optic Conversion Module)
Communication media: Industrial Ethernet communication processors on common twisted pair, industrial shielded twisted pair, and fiber optic SIMATIC PLC controllers. Used to connect SIMATIC PLCs to Industrial Ethernet.
Industrial Ethernet communications processor on PG/PC. Used to connect the PG/PC to Industrial Ethernet.
Industrial Ethernet important performance <br> used in harsh industrial environments to ensure safe and reliable industrial applications, SIMATIC NET complements the many important performance Ethernet technology:
Industrial Ethernet is technically compatible with IEEE802.3/802.3u, using ISO and TCP/IP communication protocols, 10/100M adaptive transmission rate, redundant 24VDC power supply, simple cabinet rail mounting, convenient configuration of star type, line and ring topologies redundant safety and high-speed network, maximum network reconfiguration time of 0.3 sec · harsh environment for a network element, through the EMC testing with RJ45-through technology, industrial grade and Sub-D connector technology Fast Connect connection technology with dedicated shielded cable ensures quick installation of on-site cable installations. Simple and efficient signaling device constantly monitors network components. SNMP compliant (Simple Network Management Protocol)
· Web-based network management can be used · Use VB/VC or configuration software to monitor the management network
In today's era, the concept that the network is the control has been increasingly accepted by users. The traditional distributed control systems based on RS485, CAN, etc. buses are being used by industrial Ethernet based on the TCP/IP protocol due to their inherent flaws. Instead, the Industrial Ethernet bus is consistent with the local area network we are currently using. It uses a unified TCP/IP protocol to avoid communication problems between different protocols. It can directly interconnect with computers on the LAN without additional hardware devices. , It facilitates the sharing of data in the local area network, it can use IE browser to access the terminal data, rather than specialized software, it can be seamlessly connected with the existing LAN-based ERP database management system, it is particularly suitable for remote control, with The telephone exchange network and GSM, GPRS wireless telephone network realize long-range data acquisition, it adopts the unified network line, has reduced wiring cost and difficulty, avoid the coexistence of a variety of buses. Industrial Ethernet bus has been rapidly popularized at home and abroad because of its many advantages. Now there are a large number of supporting products in use. Such as Industrial Ethernet HUB, Industrial Ethernet Firewall, Industrial Ethernet, Ethernet to RS232/RS485, Ethernet A/D, Ethernet D/A, Ethernet AI, Ethernet AO, Ethernet DI module, Ethernet DO module and composite function module.
(2) Ethernet and TCP/IP are easily integrated into the IT (information technology) world due to the same communication protocol;
(3) Different transmission protocols can be run on the same bus to establish a public network platform or infrastructure for the enterprise;
(4) Using interactive and open data access technologies throughout the network;
(5) It has been used for many years and has been familiar to many technical personnel. The market can provide a wide range of settings, maintenance and diagnostic tools, becoming a de facto unified standard;
(6) It is allowed to use different physical media and form different topologies.
Rockwell Automation and ODVA introduced Ethernet / IP, CIP application of compressed ControlNet and DeviceNet protocols (Control and Information Protocol, Control and Information Protocol).
CIP provides a wide range of services for accessing data and control devices through "hidden" and "dominant" information.
The CIP packet must be encapsulated before it is sent. The CIP packet is given a message header whose content depends on the requested service attributes.
The Ethernet-connected CIP packets include a dedicated Ethernet header, an IP header, a TCP header, and a package header. The encapsulation header contains fields such as control commands, formats, status information, and synchronization data. This allows CIP data to be transmitted over TCP or UDP and to ensure decoding at the receiver.
Schneider Electric's "Transparent Factory", whose core is Ethernet and TCP/IP, Modbus TCP/IP module encapsulated with Modbus protocol is applied to Memetum PLC. Modbus TCP has become the standard EMIE54.9-2000 for the semiconductor industry.
HSE of FF is efficiently mapped to UDP (User Datagram Protocol), a transport protocol that is considered to be superior to TCP. Its header is shorter and simpler than the TCP header, only 8 bytes, and TCP is a variable-length 40. One of the best examples of bytes), HSE uses the Publisher/Subscriber protocol, type 5 for the IEC 61158 Fieldbus International Standard.
Another solution is to run on the upper layer of the fieldbus or packaged with TCP/IP. Interbus is such a solution. Its Ethernet strategy is to split TCP/IP packets into several small data packets and encapsulate them in the Interbus parameter channel for transmission. The sum frame protocol remains unchanged. These fragmented packets will be reassembled at the receiver to revert to the original TCP/IP packet.
The disadvantage of the encapsulation scheme is that the efficiency of the protocol is low, and the head of the Ethernet is much larger than the user data, so that the overhead is greatly increased. Therefore, the encapsulation scheme is only suitable for sending large-capacity data information.
Two embedded Ethernet I/O
As early as 1998, Foxboro Company successfully used the Ethernet I/O in its Micro-I/A automation system for the chloro-alkali branch of Bayer AG in Germany. Ethernet used all field devices, controllers and PC workstations. Integrated into a highly reliable, low-cost, real-time control information network. In recent years, some companies have introduced a lot of Ethernet I/O products. Examples are as follows:
(1) Opto 22 has been providing Ethernet I/O products since the fourth quarter of 1998, and has continuously expanded and improved its products, such as the development of radio access 802.11 and 802.11b Ethernet products and SNMP Ethernet for management. product;
(2) National Instruments Field Point I/O can provide field device to Ethernet link;
(3) SixNet provides I/O modules embedded in Ethernet chips;
(4) Optimation (Hutsrille, Ala) releases new I/O products with built-in Ethernet;
(5) The new Ethernet I/O products jointly announced by Automation direct.com and Omron Electric are available;
(6) GE Fanuc Automation announced in the US National Week in 2000 that all its automation products support links to Ethernet;
(7) Zonework (Temecala, Calif) launched its first product, claiming to be the infrastructure that enables traditional automation controllers to access Ethernet;
(8) Busware, a subsidiary of Action, announced the E-series I/O modules for Ethernet.
In addition, smart fieldbus devices with embedded Ethernet chips are now available. For example, Schneider Electric's Altivar 58 drives can be connected not only to the company's PLC series, but also to third-party controllers with built-in Web servers. The controller also provides remote access to various data of the Altivar 58 drive. 