How to get steady state error values of a closed loop negative feedback system

How to get steady state error values of a closed loop negative feedback system using .m file command

for example,

s=tf('s');

G = 5/(s^2+2*s+25);

C = pidtune(G,'pid');

sys = feedback(C*G,1);

So now I want the values which is input to PID controller = steady state error values

How to do so ????

[izas]

I am not sure if you are still interested in the answer.

Y/R = CG/ (1+CGH); where H=1 in this case

(Error* CG)/R = CG/ (1+CGH);

Error (s) = R/ (1+CGH)

This is to say, the error is:

(one divided by (one plus the open loop)) multiplied by the reference.

If you need the final value in time, you apply the final value theorem (FVT). The FVT states:

lim e(t) = lim s * E(s)

t->inf s->0

[Karrar]

Hi,

Thank you for your answer.

Regards.