Hi,
I want to convert 2 diff INT datatype TO 1 Real datatype.
for example:
int1: int
int2:int
real3:real
How Can convert int1&int2 TO Real3?
Thanks

In order to give you a good anwser, you need to be more specific as your question can be interpreted in twofold. I interpret you question with a simple anwser on face value;

Do you want INT A + INT B = REAL C?

rC := INT_TO_REAL( iA + iB);

If you want something more complex, please explain very specific what you want to accomplish.

Regards

Can I use it like:
TYPE Convert_2_int_to_byte :UNION

 i: WORD;
 c:WORD;

bytes: ARRAY [0..3] OF BYTE;

END_UNION
END_TYPE

TYPE Convert_Real_to_byte :UNION

a:REAL;
bytes: ARRAY [0..3] OF BYTE;

END_UNION
END_TYPE

nope...

Google for IEEE 754
https://en.wikipedia.org/wiki/IEEE_754

unless...

Your INT's (Bytes) allready have been 'marshalled' to hold IEE 754 bit and bitorder and you want to glue the bytes together again to get the original REAL (Float)

Are you using Profibus or MODBUS so?

MDLC -> Google brings up nothing, what is a MDLC?

glue the bytes together INTA , INTB to get REALC(Float) -> Google for IEEE 754 to understand a float. https://en.wikipedia.org/wiki/IEEE_754

If you want no marshalling you can use the union solution you posted before

If you define a new variable as Dint for example you can use:

diNewVar := SHL(int1, 16) + int2;
real3 := dint_to_real(diMyVar);

Ofcourse real3 will still be an integer value in that case.

Edit: Im not in front of an IDE right now so i assumed there is an Dint_to_real function, otherwise use a format that is convertable for the "diNewVar".