How to set the limits of a saturation block from workspace

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?

[Robert]

Can you be more specific about what you see in the code? Are your saturation blocks being "optimized" away by the build routine?

If your code is using inline constants, your variable may be inlined, then possibly folded into a neighboring expression. I suggest you try

myLimit = Simulink.Parameter(myLimit);
myLimit.CoderInfo.StorageClass = 'SimulinkGlobal';

to make your saturation limit variable a tunable parameter. This should help you track it down in the code and better understand why it is or isn't included.

[Christian Boettcher]

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...

[Mark McBroom]

Change storage class from SimulinkGlobal to ExportedDefine