You can include System object™ code in Simulink® models using the MATLAB Function block. Your function can include one or more System objects. Portions of your system may be easier to implement in the MATLAB® environment than directly in Simulink. Many System objects have Simulink block counterparts with equivalent functionality. Before writing MATLAB code to include in a Simulink model, check for existing blocks that perform the desired operation.
For an example of the type of code to write in the function, try System objects in MATLAB Code Generation. That page shows an example of a function that uses a System object and is suitable for use with MATLAB Coder. That same style of function should also work with the MATLAB Function block.
