fcn blocks, model referencing and workspace variables

Hello there,

I created a model (say TestModel) composed just by a Fcn simulink block. This fcn block has just one input and one output. The function is something like this

f(u)=c1*exp(u)

By defining a variable c1 with a certain numerical value in the TestModel workspace everything works fine. However, I wish to use TestModel in another model via model referencing. Hence, I defined the variable c1 in the workspace of TestModel and I assigned this variable as model reference parameter. However, when defining a Matlab variable in a local workspace, this variable must have a numerical value. When using model referencing, this variable is considered as a model parameter, and I expect that its default numerical value will be overwritten by the parameter passed from the ModelReference Parameters pane, right?

Unfortunately this is not the case: I set c1 with value 0 as a Matlab variable in the workspace of TestModel, and I also considered c1 as a parameter. Now, from the ModelReference Parameters pane, I pass the numerical value 8, expecting that the model TestModel is referenced c1=8. However, this is not the case. The value of c1 gets stuck to 0 independently to the numerical value that I pass through the ModelReference Parameters pane. How can I solve this problem in a very clean way?

Thanks, Ubaldo

Answer 1

[Kaustubha Govind]

I think you might need to declare c1 as a Simulink.Parameter object and define it in the base workspace. See Global Tunable Parameters.