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

Issue 1.2 – Apr 2006

©ELPRO Technologies Pty Ltd

Page 4 of 12

app_905U-G_ModbusTCP_1.2.doc

Create a new Channel and add the

following

Name – Any name you want

Model – Select Modbus

IP address – Must be the same as the

one configured in the 105/905U-G-

ET1

Timeout times -Default. Connect

timeout = 3, Request Timeout =

1000, Fail after = 3.

TCP/IP port - 502.

When this is done you can setup appropriate tags for the I/O.

In this example I have setup 4 Modbus Read Word Tags starting at Modbus address 30001

tags and 1 Modbus Write word Tag at address 41025.

The Modbus Command is made up of a Command and a Modbus Address.

Modbus commands are 0X = Write Bit, 1X = Read Bit, 3X = Read Word, 4X = Write Word

So 30001 will Read Word at Modbus location 1 or 41025 will Write Word to Modbus

Location 1025.

For Further Information on addressing refer to ELPRO 105/905U-G Manual for

Modbus TCP Addressing Ranges

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 65 66

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Elpro Technologies 105U-G Spécifications Page 30