Modicon M580 Plc Page 7-3 Technical information, index

7/3 Topologies Technical information Ethernet network Infrastructure Different network topologies Star topology In a star topology, all devices and Data Terminal Equipment (DTE) are connected though an intermediate device. Ethernet star In an Ethernet star the intermediate device may be a switch . The star is the most commonly used topology in corporate networks and is currently adopted in almost every automation application. As mentioned previously, for industrial Ethernet applications the use of full duplex switches as the central device rather than hubs is highly recommended. Deploying star topologies with ConneXium Star topologies can be implemented with any of the switches in the ConneXium offer. Bus topology The bus is one of the most common topologies in traditional industrial automation networks. A single trunk cable connects all devices on the network usually via passive or active T-connectors, or directly chained (daisy chain). Devices can usually be installed anywhere along the bus. Ethernet bus An Ethernet bus can be deployed by interconnecting switches in line and considering every one of them as the connection for a drop device. An unlimited number of switches can be interconnected to achieve this purpose. Deploying bus topologies with ConneXium Bus topologies can be implemented with any of the switches in the ConneXium offer. Switches with 1 or 2 fiber optic ports are particularly suitable for this purpose: b Switches with 2 fiber optic ports can be used to connect in-line devices. b Switches with 1 fiber optic port can be used to connect end-of-line devices. Daisy chain topology Daisy chain - along the bus - is the other most common topology in traditional industrial automation networks. Cable segments interconnect multiple devices, being the devices part of the network cable. Ethernet daisy chain Daisy chain is currently not a particularly common Ethernet topology, but it is likely to rise in popularity as more devices become available. Ethernet daisy chain devices have: b 2 Ethernet ports and b 1 embedded switch . Schneider Electric is launching Industrial Ethernet devices on the industrial market for connection in daisy chain architectures. Deploying daisy chain topologies No switches are required for daisy chain topologies. All devices have an embedded switch. Dual port Ethernet at device level is an absolute integral component for daisy chain topologies. One port on the device connects to one port on each of the two neighboring devices. These neighboring connections make up the daisy chain. Ethernet switches can be employed in a daisy chain topology when multiple scan chains are in use by the controlling device. It is expected that the Ethernet switch will be located near the controlling device with the different scan chains emanating from the switch. DTE DTE DTE DTE 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10

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