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Modicon M221 Plc - Page 24 Industrial Ethernet



Industrial Ethernet network

For Modicon M221, M221 Book, M241 and M251 logic controllers and Modicon TM4ES4 Ethernet switch module


Industrial Ethernet is the term used to refer to industrial communication protocols which use standard Ethernet physical layers such as: v EtherNet/IP v Modbus TCP v TCP and UDP On an Industrial Ethernet network, it is possible to connect: v industrial products (industrial communication protocols) such as controllers, variable speed drives, robots, etc. v products using TCP/UDP-based proprietary protocols In addition, it is possible to use different Industrial Ethernet protocols on the same network simultaneously. EtherNet/IP protocol EtherNet/IP is an industrial communication protocol based on CIP (Common Industrial Protocol), owned and managed by the ODVA, an international independent standards organization (www.odva.org). EtherNet/IP results from implementation of the CIP protocol on standard Ethernet. EtherNet/IP operates on the same equipment and the same infrastructure as Modbus TCP, and both protocols can be activated simultaneously and at any time on the network. EtherNet/IP is a robust protocol which allows the use of sophisticated equipment such as cameras, robots, etc. Advanced services and outstanding performance EtherNet/IP is object-oriented. In each EtherNet/IP device, the data are categorized as objects and each device can be associated with several types of object depending on its intended purpose. Equipment is integrated more easily thanks to predefined objects and standards. The EtherNet/IP protocol uses an Originator/Adapter architecture for data exchange. Modbus TCP protocol Modbus has been the industry communication standard since 1979. During the internet revolution, Modbus was combined with Ethernet to form Modbus TCP, a completely open Ethernet protocol. Modbus TCP, simple and open The Modbus application layer is simple and universally familiar with its 9 million installed connections. v Thousands of manufacturers have already implemented this protocol. Many have already developed a Modbus TCP connection and numerous products are presently available. v The simplicity of Modbus TCP enables any fieldbus device, such as an I/O module, to communicate over Ethernet without the need for a powerful microprocessor or a lot of internal memory. Modbus TCP, a standard v The application protocol is identical on Modbus serial link and Modbus TCP: messages can be routed from one network to the other without converting the protocol. v Since Modbus operates on the TCP/IP higher layer, users benefit from IP routing, thus enabling devices located anywhere in the world to communicate without worrying about the distance between them. Modbus and Modbus TCP are recognized as a fieldbus by the international standard IEC/EN 61158. They also comply with the national Chinese standard managed by ITEI. The Modbus TCP protocol uses a client/server architecture for data exchange.

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