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

Issue 1.2 – Apr 2006

©ELPRO Technologies Pty Ltd

Page 5 of 12

app_905U-G_ModbusTCP_1.2.doc

Each Tag needs to have

Name – Tag name

Modbus address – Standard Modbus

command & address i.e 1X, 3X, 4X or 0X

Description - Description of what the I/O is.

Data type – Select Word as all Gateway

registers are 16 bit

Client Access – Read only for inputs or

Read/Write for Outputs.

Scan Rate – Default 100 mSec.

You can also setup Scaling on

each of the Tags if you wish.

105/905U-G I/O registers are

16 bit (0 – 65535) and a

typical range for an analog

value from a field station is

4mA = 16384 decimal

20mA = 49152 decimal

This is shown here as being a

linear scale of 0 to 100 % is

equal to decimal value 16384

to 49152

For Firmware versions 1.76 and above Scaling of the I/O registers can be applied in the

E-series configuration software for all read and write commands.

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Elpro Technologies 105U-G Spécifications Page 31