PID BLOCK IN SIMULINK

I have worked out that my PID controller is

Gc = 4.2(1 + 1/1.57s + 0.39s)

I want to put this into a block on simulink but the PID controller block in simulink is in a weird form. Does anyone know how to get around this. Thanks.

Answer 1

[Ameer Hamza]

In the Simulink PID block, In the form field, change the form from parallel to ideal and set the value of filter coefficient N to be quite high (say 200). Then parameters P, I, and D can be used from your current transfer function.

[Uzair Akhtar]

Thank you. Do you know what impact the filter coefficient N has to the system.

[Ameer Hamza]

PID block uses a low-pass filter for D term. The value of N controls the stop-band of the low-pass filter. Higher the value of N, higher is the stop-band frequency. For the low-value of N, the PID block will smooth the derivative of your system. If you have a high value of N, the filter will have no significant effect.