Modbus configurator

The Modbus configurator lets the user select which data should be available in the first 500 Modbus addresses for Modbus function 04.

Profibus users often use this function to select the data they can use. That is why the first address range is called Profibus. This first address range is shared by Profibus and Modbus users, as they share the same data.

To open the Modbus configurator, select Modbus Configurator from the left toolbar in the utility software.

Using the Modbus configuration, you can configure Modbus addresses 0 to 499 to any of the Modbus addresses from 500 to 1999, as shown below.

The window has four different columns that are described below:

Range: Each Modbus range contains 100 Modbus addresses (63 for the Profibus range). In the screenshot above, the Modbus address range 0 to 99 is selected.

REG: The information in the specific address REG is duplicated from the Modbus address configured in Value. The number changes when another range is selected (0 to 499).

Value: The Modbus address (500 to 1999) of the information that will be copied to the corresponding REG Modbus address.

Description: Free text for the user to fill in. The text is only saved in the parameter file. In the screenshot, Modbus address 000 duplicates the information of Modbus address 501, which displays the PV voltage between L1 and L2, as the description shows.