Internet PLC Forum

I'm trying to use an interupt (INTRDEF) to activate a hs timer.  The timer(s) have been been defined high speed in a custom function executed at the beginning of the program.  Should the interupt custom function be positioned in the same ladder circuit as the timer or in a circuit immediatly before the timer circuit?  I need to eliminate any lag between triggering the input and starting the timer.  Thanks in advance for your insight.