Modicon M251 Plc Page 5 Modicon M251 logic controllers

5 Presentation (continued) Modicon M251 logic controllers Options for Modicon M251 logic controllers Options for Modicon M251 controllers Memory card The TMASD1 256 MB industrial SD memory card is available for: v application backup v program transfer v data logging v irmware updates Communication modules (1) There are 2 communication module models available for Modicon M251 logic controllers: v TM4ES4 Ethernet switch module v TM4PDPS1 Profibus DP slave module Modicon TM4 communication modules are assembled by simply clipping them onto the left-hand side of the controllers and a bus expansion connector is used to distribute data and power. A maximum of 3 communication modules can be added on the left-hand side of M251 logic controllers. See page 12. b Ethernet switch module v The TM4ES4 module is a 4-port Ethernet interface (10/100 Mbit/s, MDI/MDIX) with the Ethernet Modbus TCP (Client/Server), Ethernet/IP (adapter/originator), UDP, TCP, SNMP, and SoMachine protocols. v Clipped onto the left-hand side of a Modicon M251 controller, it consists of a standalone 4-port switch powered by the Modicon M251 controller. b Profibus DP slave module v The TM4PDPS1 communication module can be used to configure a Master connection on the Profibus DP bus. (1) For the rules on combining Modicon TM4 communication modules and Modicon M251 logic controllers, see page 12. M251 logic controller Communication modules Industrial SD memory card Profibus Ethernet Ethernet 1 Ethernet 2 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10

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