Dear Mr. Chaumontet

I recommend you to use a Z transform.

s(t) = s(t-1) + e(t) -> S(z) = S(z)*(1/z) + E(z) -> S(z) = (z/(z-1))*E(z)

Use the discrete transfer function of SCICOS, where e(t) is the input and s(t) is the output.

Don't forget to select an appropiate sample time.

Good luck.

Raymundo Cordero

PerĂº