Hi Donghyuk,
Your model seems to be working as expected - the output it gives is correct.
Variable integer delay simply implements the equation y(t) = x(t - d(t)*Ts), where 'Ts' is sample time and 'd' is the integer delay signal given as input.
For your question, for the time that d=7 it would go back 7*0.1 (because sample time is 0.1) = 0.7 seconds and produce the input it received then (so to speak). Then, at t = 0.1-0.2 when d=4, it's outputting the input value from 0.4 seconds ago. Then, when d=8, it outputs the input it recieved 0.8 seconds ago. And so on....
Hope that clears it up.
