How to set a system constant to be used in multiple blocks in Simulink

I am beginner in Simulink.

I have a large system making use of same type of component models (each as user-defined Matlab function). I want to make a parametric study to evaluate the system for different parameter values at the component so I need to define the parameter values centrally. Is there a way to define the system parameters at one block (somehow it will generate the global variables) so the component model parameters will get updated automatically?

Answer 1

[Fangjun Jiang]

The general approach is to define a parameter (e.g. MyPar1) in base workspace or in a data dictionary, then you can use this parameter for multiple blocks (for example, specify the Gain as MyPar1 or the value of a Constant block as MyPar1).

In the case of MATLAB function block, you can click "Edit Data" in the Editor and then Add Data, specify the Scope as Parameter.

[Hakan Tol]

Thanks for the quick answer. Would you please tell about this data dictionary? Or any useful link for that? Is it something like I define the value for the constant system parameter in a block (i.e. as MyPar1) and then use it in other blocks without signal connections?

[Fangjun Jiang]

Yes. Just start withy MyPar1=1 in base workspace and then use it anywhere in your model.

Later, you can manage this in a "Simulink data dictionary".

[Hakan Tol]

Thank you.