How can I sum (or subtract) two long integers?

I'm trying to sum two numbers, one of them an int and the other a long int, but the result is trash. Is there some manner of the summingJuction to sum (or subtract) two long ints?

Rodrigo, this should work

Rodrigo, this should work just fine. How are you trying to do it? Please attach your diagram. You can use our fixedpoint block set if you want to model overflow effects. Pete