PI controller step input

Hello colleges

I am doing simulation in Matlab Simulink and I cross on one problem. Before signal goes to PI controller I make a sum of measured value (which in my case is constant) and desire value (also constant). If I run simulation nothing happened. Than I put in my simulation STEP with innitial value (measeured value) and Final value(desire value). If I run simulation with this configurations PI controller is tracking my desire value from zero and not from my measured valued like I want.

What input signal can I set or any other solution would be great. Thank you very much for your response.

Answer 1

[Sabin]

First of all it is not the sum of desired and measured values, it should be the difference, error = desired value - measured value. For an example check:

https://www.mathworks.com/help/simulink/slref/anti-windup-control-using-a-pid-controller.html