Schneider Unity equivalent of RSLogix DDT instuction

Hi, I have some RS Logix 5000 code and have to write the equivalent in Unity Pro 8.1 in function block.
In Logix I am using the DDT instruction to look for differences in the bits of 2 arrays (type DINT[32]), then record where those differences are.
To paraphrase Rockwell help: The DDT instruction compares the source array to the reference array and stores the locations of any mismatches in the result array. The controller also changes the mismatched bits in the reference array to match the source array.
So I'm completely stuck on how to do this in Unity (I'm not familiar at all with it). I'm investigating the EQUAL_ARDINT but don't think that will quite do it.
Help?

May have a look around this place http://www.unitypro-experts.us/home

Can't seem to open that link?
Edit: Won't open in IE (yes - I still use IE). Opens in FF.

Hmm it is .us
Maybe you can google unity pro experts

Had a look on the website and couldn't find anything to help with this particular question.

I think that there is no direct replacemant, you need to do own FBD block

Maybe XOR and invert result after XOR. Then you have bit table which shows if there is differences.
After founding bits, copy source to result array.

Another way can be to use search GT and LT array functions. Then copy from source to reference with founded place. You need to do this x times

Hi Sarah
Equal_ardint does a comparison between 2 arrays. This gives you a result where the 1st difference is in the 1 array. But you can specify where the comparison must start. So if you write some code you could start initially at position 0 then if the array does find a difference record it and the let the block compare from the position it found the difference +1.There are other array function blocks aswell in the library that you could use

Find_eq_ardint might also be an option

Doing this:

FOR (WordIndex :=0 TO 63) DO
FOR (BitIndex :=0 TO 15) DO
wMask := SHL(16#0001, BitIndex );
IF A[WordIndex] AND wMask NE B[WordIndex] AND wMask THEN
B[WordIndex] := B[WordIndex] OR (A[WordIndex] AND wMask);
Res := (WordIndex*16) + BitIndex;
(other stuff) ;
END_IF;
END_FOR;
END_FOR;