Can you tell us the tag names of the INTs?
If they are consecutive in an array, then you should be able to merely use the COPy with the first one as the source, the DINT as the destination, and a Length of 1 (the length is in reference to the destination data type).
If they are not consecutive, then you can MOV the least significant INT to the DINT first, then use BTD (bit field distribute) to move the 16 bits from the most significant INT into the DINT,
Or
CLR the DINT first, then MOV the most significant INT to the DINT first, then multiply by 2^16 to shift those bits to the high end of the DINT, then MVM the least significant INT into the lower end (masking out the higher bits so they are left intact).
There may be other simpler ways to do this, some other more experienced Logix5000 users may be able to add to the thread.
Paul