Sample time Propagation Error - The sample time after propagation is [0, 0]. Enter a discrete sample time

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Vignesh Venkatachalam 2015-6-30

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评论： Amin Ahmed 2016-5-28

Hello,

I'm getting the following error,

The sample time after propagation is [0, 0]. Enter a discrete sample time in ....... Zero-Order Hold1

I checked the entire model, all blocks have a sample time of 0.01 or -1(inherited) and also there are no continuous states within the model. I'm not sure why this error is coming up.

The above error points to Zero-Order Hold block which has a sample time of -1 (inherited), if I change that to 0.01 the simulation is running, but there are lot of places within my model which has inherited sample time changing each and every block would be cumbersome.

I appreciate any suggestion to overcome this issue.

Thank you!

Vignesh

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Answer 1

Adam Hug 2015-7-2

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Hi Vignesh,

Here is the doc page on how Simulink propogates sample times:

http://www.mathworks.com/help/simulink/ug/how-propagation-affects-inherited-sample-times.html

I suspect that you are feeding the Zero-Order hold block a continuous signal. According to the chart, this may be confusing Simulink when it comes time for it to assign sample times to each block.

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Vignesh Venkatachalam 2015-7-6

Thanks Adam that was very helpful, You were right, at a particular place I was feeding in a continuous signal, after changing that the above issue is resolved.

Thanks again, I really appreciate it.

Amin Ahmed 2016-5-28

Ok tell us how did you overcome this problem

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