To generate an S-Function from a Simulink model or subsystem, the slbuild command can be utilized. It's necessary to set the SystemTargetFile parameter in the model's configuration to "rtwsfcn.tlc" and ensure GenCodeOnly is set to 'off'. Here is a code snippet demonstrating this process:
% Set up the configuration for code generation
cs = getActiveConfigSet(<modelName>);
set_param(cs, 'SystemTargetFile', 'rtwsfcn.tlc');
set_param(cs, 'GenCodeOnly', 'off');
% Generate the S-function
slbuild(<subsystemPath>);
In the code above, replace <modelName> with the name of the model and <subsystemPath> with the path to the subsystem intended for building, or simply use the model name for <subsystemPath> to build the entire model.
However, this approach seems to be deprecated since MATLAB R2022b as stated in the release notes linked below:
The recommended alternative as stated in the release notes is to use a Protected Model. Further, information can be found in the following page:
