having blank plot at plotting control action in sisotool

I have to use sisotool using design requirements : settling time =0.2 sec Overshoot= 5% for the system given as : 1.01/(0.0006202s^3+0.05723s^2+1.028S) my code is :

J =0.02215 ;
b =0.002953;
K=1.01;
R =2.58 ;
L = 28*(10^-3);
s = tf('s')
P_motor = K/(s*((J*s+b)*(L*s+R)+K^2))
sisotool(P_motor)
step(P_motor)

and add real zero at -34.8 but while plot step plot for the r2u I get a blank plot of the control action

Answer 1

[Star Strider]

Your code works for me (in R2017b. It takes a while to render, so be patient with it.

Adding the zero: