The chart named "ControlModule" contains the control logic and it will be used for PLC code generation.

You can generate PLC Structured Text code for this subsystem by right-clicking on the subsystem block and select PLC Code -> Generate Code for Subsystem

Alternatively, you can use the following command generatedFiles = plcgeneratecode('plcdemo_stateflow_controller/ControlModule');

After the code generation, the Diagnostic Viewer window is displayed with hyperlinks to the generated code files. You can open the generated files by clicking on the links.