How to initialize a Unit Delay block with a Bus signal from a Data Dictionary in the Model Workspace in R2021a?

My model contains a Bus signal feeding a Unit Delay block which should be initialized:

So that Bus elements a and b have different initial conditions.

I saw that one can use the following workflows:

https://www.mathworks.com/help/simulink/ug/specifying-initial-conditions-for-bus-signals.html#bsff88y

But how can I create the MATLAB struct inside the Model Workspace which should get Bus type data from a Data Dictionary (DD). Besides this I also want to use variables/values from the Base Workspace in the MATLAB struct.

How can I do this?

Answer 1

[MathWorks Support Team]

The attached example contains the following information which solves the issue:

The following MATLAB code is used to create the struct:

initBUS = Simulink.Parameter;
myDictionaryObj = Simulink.data.dictionary.open('testDD.sldd');
initBUS.DataType = 'Bus: myBus';
initBUS.Value = Simulink.Bus.createMATLABStruct('myBus',[],1,myDictionaryObj); %initializes the struct using the 'scope' property to search for the type in a data dictionary
initBUS.Value.a = evalin('base','aVar'); %gets data from Base Workspace
initBUS.Value.b = evalin('base','bVar'); %gets data from Base Workspace

clear myDictionaryObj

The following property is used to get the Bus type from the Data Dictionary:

https://www.mathworks.com/help/simulink/slref/simulink.bus.creatematlabstruct.html?s_tid=doc_ta#mw_f91de731-6ac7-4037-bd46-235a04f4256f

After that you simply only have to add the variable initBUS in the Unit Delay mask as follows:

and finally the simulation result is correctly initialized:

If anything is unclear please consider contacting the technical support team for further assistance.