MATLAB: Continuous sample time is not supported by discrete derivative

Question

Hello:

I want to know if there exist typical causes for having errors when dealing with discrete derivative block in Simulink. My error is:

"Continuous sample time is not supported by block 'Controller)/Controller/increment/Discrete Derivative/TSamp'"

Although it is a discrete system, it says somthing like a continuous signal is arriving to this block and this is not supported. I have realized before that when there exist huge variations of the input signal in the first time steps, the same o similar error appears.

Thank you in advance

Answer 1

Without seeing the model, it's difficult to be specific, but it sounds like you are trying feed a discrete block with a continuous signal. Insert a Rate Transition block with the appropriate sample time before the discrete block and that should fix it. You should also read the section of the documentation on Working with sample times.

HTH,

Arnaud