Hello
I'm using codesys v3.3 to meassure the values of a SENECA (S604E-6-MOD) wattmeter, but while reading the values for the Phase 3 current, i'm getting wrong values, the reason being that when I input the holding register (HEX: 1012) it shows the wrong values (it reads 2 registers 1012 and 1013) and the when I input a value (HEX: 1013) it reads 2 registers 1013 and 1014 but the problem is that the 1014 register is the register for Neutral current. Is there any way to combine the register or switch the order of reading them ( ex. first read 1013 and then 1012)?
(the value of the Phase 3 current should be ⁓1.250)

Hello
you can use a union to swap the words

code

UNION
RealValue : REAL;
MbValue: ARRAY[0..1]OF WORD;
END_UNION
END_TYPE

Here is a function to convert two Mb-Words in a Real-Value.

code

FUNCTION F_MbConvert : REAL

VAR_INPUT
MbWord0: WORD; // ModBus-Register 1
MbWord1: WORD; // ModBus-Register 2
SwapWord: BOOL; // true = swapping MbWord0 <-> MbWord1
END_VAR

VAR
_uMbValue: uModBusValue; // Union
END_VAR

IF SwapWord THEN
_uMbValue.MbValue[0] := MbWord1;
_uMbValue.MbValue[1] := MbWord0;
ELSE
_uMbValue.MbValue[0] := MbWord0;
_uMbValue.MbValue[1] := MbWord1;
END_IF

F_MbConvert := _uMbValue.RealValue;

Reinhard

Hello,
here is a small test project. The MB slave is just a dummy, you have to insert your slave. The main program is the PLC_PRG, it calls the Prg KOP.
Greetings Reinhard