MATLAB & Simulink: open-loop system and PID control system

Using MATLAB and Simulink, the tutorial goes through the simulation of the following:

1. Open-loop system: use of step input, transfer function, scope and mux

2. Open-loop system with disturbance: use of summing junction for control feedback and the addition of a disturbance

3. Feedback PID control system: use of the PID controller block and tune button

[alidin-hktn]

i used a pi controller to control a simple first order system, and i used pso algorithme the find best pi parameters, but the simulation stop in the begining and show this message : Derivative of state '1' in block Fcn' at time 9.2 is not finite. The
simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size
(either by reducing the fixed step size or by tightening the error tolerances)

[nurdinisyarafana]

Hey can i know, what is the difference betwen p, pi and pid ? And what is the main objectives we do the simulation for pid tuning ?

[naseralshamsi]

why is the final value of the disturbance is 0.1? i am doing a project and the final value initially is 314, so what should the final value of disturbance be?

[muhammadaamirnashrullah]

can u tell me where is the controller part/block controller?

[amiraslam]

How i can write "H(s)= s+1 " as feedback