How to set the limits of a saturation block from workspace

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Christian Boettcher 2016-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/296496-how-to-set-the-limits-of-a-saturation-block-from-workspace

评论： Mark McBroom 2016-8-24

Hello everyone!

I have several saturation blocks in my model and i want to change the upper and lower limits at once. I defined a variable in the workspace, and simulink just takes it as the upper and lower limit. But if i build code nothing happens. There are no range checks at all. If i enter the value directly, i get correct results...

For example:

myLimit = 5

Upper Limit: myLimit

Lower Limit: -myLimit

-> Noting happens in the Code

Upper Limit: 5

Lower Limit: -5

->Range checks as desired

Are there any ways to change these limits with a single line of code?

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Christian Boettcher 2016-7-21

Yep, they are victims of the optimization. The code doesn't change at all...

I tried your suggestion and it works.

I don't want to have this value tunable actually. It's just a limitation to avoid overflows. So it's set once and shouldn't be touched after that. I want to have this value centrally to avoid magic numbers in the model and if i must change it, i would like to save time.

I would love to have something, which leads to a #define in the c code and does the range checks against the defined value...