I configured the Modbus client function on the DXAdvanced series, but I can't connect to the Modbus server. Can I check the Modbus operation status?

Yes, press the DISP/ENTER key, and then select [INFORMATION] > [MODBUS CLIENT].
In order for [MODBUS CLIENT] to appear in the screen menu, you must configure it in the menu customization function.
See "Checking the Modbus Operating Status" in section 1.10, "Using the Modbus Client Function" in the Communication Interface User's Manual.