subroutine problem

hi ,

i m new to ladder prgramming. i would like to know that in Allen bradley i have seen that when u call a subroutine program flow goes to that particular lad no. and it scans it(this happens in normal scan) but when that subroutine is not supposed to be called then the output of that ladder remains in their earlier state . how shall i keep them in reset state when that ladder is not called.

Conditional subroutines can be tricky.
In the main ladder, use the opposite of what ever is calling your sub to set the outputs to the desired state.

Something like this:

If Condition TRUE THEN
Go Sub
Else set outputs
Endif;

You can download a simple Washing Machine program that uses conditional subs here: http://forums.mrplc.com/index.php?download=359
You can see how the resets are handled outside the sub.