Read input register with M340, via READ_VAR

[SIGE_BMR]

Hello,

I'm trying to read the values on a flow meter via Modbus TCP with a M340 CPU and a NOE card.

The hardware configuration goes like this: Flow meter -> Modbus RTU to TCP Gateway -> NOE.

When I use a Modbus TCP Client on my PC (simply Modbus), I can read the modbus register just fine.

I use the function 4 "Read Input Registers", and I'm reading for example the 30103 register.

To do this in Control Expert (License XL and V16.0 by the way), I wrote this code in the MAST task:

GEST_READVAR[2] := 50;
IF NOT GEST_READVAR[0].0 THEN
READ_VAR (ADR := ADDM('Ethernet_1{192.168.50.153}1'), OBJ := '%IW', NUM := 30103, NB := length_arint(RECP_READVAR), GEST := GEST_READVAR, RECP => RECP_READVAR);
END_IF;

reTest := WORD_AS_REAL(LOW := INT_TO_WORD(RECP_READVAR[0]), HIGH := INT_TO_WORD(RECP_READVAR[1]));

(RECP_READVAR is an ARRAY[0..1] OF INT, reTest is a REAL).

Currently, the values of lines 0 and 1 in the RECP array are both 0, but simply modbus displays other values, so something must be wrong but I don't know what.

Does anyone have an idea of what I can do to make this work?

(you can find the datasheet of the Modbus RTU module attached to the topic, with register numbers on pages 19 to 26)

Thanks a lot for the time anyone would take to look into this😀