Hello,

First of all I'm new in codesys. My problem is converting values (which I will type on touchscreen) on array of bytes. I have Array of 6 bytes which include 3 parametrs. How can I convert values (word) into bytes? Unfortunately there is no FB for this converting. Please help. I use this for acyclic data in Profinet (wrrec FB).

Easiest way to do this is to create a type like this :

TYPE uWordBytes :
  UNION
    rValue : WORD;    // Needs 2 Bytes in memory
    abValue: ARRAY [0..1] OF BYTE;
  END_UNION
END_TYPE

Then in your program you can declare your variables like this :

my_var : uWordBytes;
my_var_as_word : WORD;

// ...

my_var.rValue := my_var_as_word;

Then it will automatically fill the array my_var.abValue with the corresponding bytes ! You can access those bytes the same way :

x[0] := my_var.abValue[0]; // First byte
x[1] := my_var.abValue[1]; // Second byte

Beware of the endianess of the value though, I don't remember if it's little endian or big endian...

By the way to create a new type you have to do : right-click on application --> Add Object --> DUT...

Hope this helps !