Question
I created a Simulink Model and I would like to use the Test Manager in Simulink Test to run numerous test cases on a Speedgoat (realtime test). For some test cases I would like to use Scripted Iterations in Test Manager in order to change the speed. The speed is defined in a constant block. The problem: I try to set the contents of that constant block in scripted iterations using setVariable('Name', 'Value', 'Source', 'MainTestModel/SpeedBlock','Value', k) While executing the testcase "Real time normal shift chain" , I get an error : Invalid parameter 'MainTestModel/SpeedBlock/Value'. What am I doing wrong? How can I change the value of the constant block in iterations? Is it also possible to use a struct in the constant block and still update using "setVariable" ?
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Expert Answer
Prashant Kumar
PhD Expert
Answered Nov 20, 2025
The idea is to make use of the "Parameter Overrides" section of the "Real time normal shift chain" in the Simulink Test Manager.
Please follow the steps below:
- Select the test "Real time normal shift chain"
- Open "Parameter Overrides" section
- Click "Refresh" at the bottom of the table. This will actually build the real-time application and retrieve all the available parameters in the model
- Note down the name of the parameter set / workspace variable that corresponds to the model element 'MainTestModel/SpeedBlock'. It is likely named 'Speed' based on what I see of your model.
- Now you may override this value as follows:
>> setVariable(testItr, 'Name', 'Speed', 'Value', num2str(k));
in your test iterations.
Note that the "Source" argument is not needed here as the 'Speed' variable is already associated with the model element 'MainTestModel/SpeedBlock'.
The For Iterator block, when placed in a Subsystem block, repeats the execution of a subsystem during the current time step until an iteration variable exceeds the specified iteration limit. You can use this block to implement the block diagram equivalent of a for loop in a programming language.
The output of a For Iterator Subsystem block cannot be a function-call signal. Simulink® displays an error message when the model update
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