How to add disturbance in Sisotool

Hello!

I am using Sisotool to design a controller and one of the factors in the design is to make sure you account for a step disturbance (dU). So I was wondering how do I add a step disturbance dU?

[Mathieu NOE]

hello

you should be more precise whan you say "account for step disturbance" ; this should be translated into how fast and how much of the disturbance must be rejected ... so what are the specs ?