Using struct as a constant input in Simulink

Bao Dang

2017 9 21

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14 次查看（30 天）

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Simulink_Struct.PNG

Hey all,

I have currently some trouble with using structs as a constant input in Simulink. As seen in my script, I generate first the struct and then the assosicated bus as data type for my "Constant"-Block in Simulink:

% ST as struct
ST = struct;
ST.A1 = 1;
ST.A2 = 2;
ST.B3 = 3;
% bus_ST as data type
busInfo = Simulink.Bus.createObject(ST);
bus_ST = eval(busInfo.busName);

In the attached screenshot you can see my simulink model. The Constant Block has the constant value "ST" and the output data type is "Bus: bus_ST". The simulation runs without errors, but I do not get any values from my "simout". My "simout" is a struct with three timeseries, but they are all empty.

I also tested the ex_constantbus model from the documentation. This works without problem and delivers the outputs from the constant block. But I do not know why it works there and not in my model. Does anybody know the reason or a solution?

Apart from that, is there another option to rename the bus, instead using the eval() function? Perhabs directly in 'Simulink.BuscreateObject()'? Thanks in advance.