If you would like to specify sample time during harness creation, you can define a PostCreateCallback function to set the sample time using set_param:
function updateHarnessSampleTime(harnessInfo)
set_param(harnessInfo.HarnessModel,'FixedStep','0.02')
end
Subsequently call harness creation:
>> sltest.harness.create(<harnessOwnerModelName>,'Name',<harnessName>,'PostCreateCallback','updateHarnessSampleTime')
The PostCreateCallback option can also be specified using the harness create dialog.
More on this option here: https://www.mathworks.com/help/sltest/ug/customize-test-harnesses.html
Of course, harness sample time can also be updated post creation from it's Configuration Parameters or using the 'FixedStep' argument and set_param programmatically.
If you are trying to set up scheduling for the top model in the harness, one other option would be to add a scheduler during harness creation using the SchedulerBlock argument in the harness create API. A scheduler block can typically be inserted when creating harnesses for models with Export function semantics or global simulink functions. If you choose this option, you can also customize the frequency of 'send' calls in the generated scheduler.
