How to set slower time sample for a subsystem inside of another periodic atomic subsystem

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CLEBER ALBERT 2019-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/491767-how-to-set-slower-time-sample-for-a-subsystem-inside-of-another-periodic-atomic-subsystem

编辑： Fangjun Jiang 2019-11-19

How can I set a time sample of 1ms for a subsystem 'A' inside of another periodic atomic subsystem 'B' running at 1us?

I do have a Simulink Coder generated S-function that runs at sample rate of 1ms and I cannot edit it. That S-function have to be inside of a subsystem that runs at sample rate of 100us and cannot remove the S-function from that subsystem or modify its time sample. It is not a problem to have the s-function running slower than the parent subsystem, but I cannot make it work. Can sameone help?

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Answer 1

Fangjun Jiang 2019-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/491767-how-to-set-slower-time-sample-for-a-subsystem-inside-of-another-periodic-atomic-subsystem#answer_402097

Put the S-function inside a Triggered Subsystem, which is set to be triggered by Function Call. Use a Function Call Generator to generate the call at every 1ms.

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CLEBER ALBERT 2019-11-18

It gives the following error:

'block1ms' has sample time 0.001. Only constant (inf) or inherited (-1) sample times are allowed in triggered subsystem 'block100us'.

Component:Simulink | Category:Blockerror

Fangjun Jiang 2019-11-19

编辑：Fangjun Jiang 2019-11-19

If the sample time of the S-function is fixed in its source code (not a good practice though), then you don't need to put it inside a subsystem that is triggered every 1ms. You can put it anywhere. It will run every 1ms. You just need to resolve all the rate transition issues.

Any block inside a triggered subsystem can not have a specified sample time. The sample time can either be -1 (which means to inherit from the trigger) or inf (means constant).

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