Dear Sir or Madam, I would like to learn something about fixed point tool just like the title from you. Does fixed point tool data type has any influence on MIL or SIL? If i use fixed point tool data type,whether the test case or test results has any different with the same model beside without useing fixed point tool data type? Another question,whether it is necessary to do SIL test if i do not use fixed point data type? Thank you.
May I ask whether you are using Simulink Test product in your workflow? And which release are you using? Thank you.
Fixed point data types are less accurate (but fast in execution) alternative for floating point data types (single & double).
If you have a floating point model, then your calculation outputs in model will have real values with more accuracy. For example a signal PRESSURE can have value of 25.356568978.
If you convert same model to Fixed point, you need to scale each floating point signal to a fixed point type with required resolution.
Signals in your fixed point model will have accuracy based on scaling. For example PRESSURE can have value of 25.35, 25.40 etc (here resolution is 0.05)
If you test a floating point model and then convert it to Fixed point and test again, results will be different.
MIL test is used to check the correctness of logic/algorithm of your model.
SIL test used to check the correctness of generated code (there can be bug or issues with code generation process also)
So this is upto your project to decide which testings you need based on project complexity, model complexity, available tools etc.