Continuous sample time is not supported by discrete derivative

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Javier Guiterrez 2011-5-10

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评论： Firas 2020-6-9

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

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Arnaud Miege 2011-5-10

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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

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Nits 2019-7-24

I am having a same issue but I am feeding buffer from Dspace serial receive block. I tried putting rate transition block with default settings, still i am getting the error mentioned below:

All sample times must be discrete. No continuous or constant sample times are allowed.

Looking forward to your solution.

Thanks