S7 1200 Modbus TCP IP starting from OP320 display

Hi, could you please help me to understand how to read Siemens S7 1200 registers starting from the following input?
To interact with the PLC I have an OP operate panel (Xinje OP320) connected via RS 485.
I need to read the same data just quering the PLC but via standard modbus TCP IP, and for this I'm using node-red-contrib-modbus.
I've tryed several ways but nothing. The OP works correctly, and here you can see a testing page:

In this case I should use:

  • FC3 function (read holding registers) / FC4 function (read holding registers)
  • address: 172
  • quantity: 2

Right?
But I don't get any data, any errors, nothing
Thanks