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Application Note 105/905U-G-ET1 Modbus TCP

Issue 1.2 – Apr 2006

©ELPRO Technologies Pty Ltd

Page 2 of 12

app_905U-G_ModbusTCP_1.2.doc

To exchange data between the 105/905U-G and an OPC Server a series of Fieldbus

Configurations that link the I/O registers of the Gateway to the Fieldbus need to be made.

In the example below Regs 1,2,3,4 are being written across to Fieldbus location 1,2,3,4.

Also Fieldbus location 1025 is being read into Reg 10.

The above example shows a Command Type Read from the Fieldbus Interface to the

Gateway. This will come from the OPC Server’s output tags.

The next Command Type Write mapping below is to the Fieldbus Interface in which the OPC

Server will read this value and store in its Input tags.

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Elpro Technologies 105U-G Spécifications Page 28