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Explicit Messaging EtherNet/IP Explicit Message Example: Write Modbus Object Overview The following unconnected explicit messaging example shows you how to use the SEND_REQ function block to write data to a remote device (for example a 140 NOC 771 01, a TSX ETC 101, or a BMX NOC 0401 Ethernet communication module) at IP address 192.168.1.102 using the Write_Holding_Registers service of the Modbus object (see page 239). You can perform the same explicit messaging service using the EtherNet/IP Explicit Message window of the Unity Pro Ethernet Configuration Tool (see page 311). Implementing the SEND_REQ Function Block To implement the SEND_REQ function block, you need to create and assign variables for the following blocks: NOTE: In the above configuration, the target module is located at slot number 4. S1A34003 10/2014 293
