By default, the Fuzzy Logic Controller block uses double-precision data for simulation and code generation. The fuzzyPID model is configured to use double-precision data. You can also use either single-precision or fixed-point data. For more information on configuring your fuzzy inference system for code generation, see Fuzzy Logic Controller.

mdl = 'fuzzyPID';
open_system(mdl)

It is good practice to validate the performance of the system in Simulink before generating code. Run the simulation.

sim(mdl)
open_system([mdl '/Output'])

Close output plot.

close_system([mdl '/Output'])

To generate Structured Text for the model, use the plcgeneratecode (Simulink PLC Coder) function, which generates code for an atomic subsystem in a model. To generate code for the Fuzzy PID controller, configure the subsystem as an atomic subsystem by selecting the Treat as atomic unit parameter for the subsystem.

subsys = [mdl '/Fuzzy PID'];
set_param(subsys,'TreatAsAtomicUnit','on')

When generating code for just a Fuzzy Logic Controller block, place the block inside a subsystem, and set the Treat as atomic unit parameter of that subsystem.

Generate Structured Text for the Fuzzy PID subsystem.

plcgeneratecode(subsys);

### Generating PLC code for 'fuzzyPID/Fuzzy PID'.
### Using <a href="matlab:configset.showParameterGroup('fuzzyPID', { 'PLC Code Generation' } )">model settings</a> from 'fuzzyPID' for PLC code generation parameters.
### Begin code generation for IDE <a href="matlab:configset.showParameterGroup('fuzzyPID', { 'PLC Code Generation' } )">codesys23</a>.
### Emit PLC code to file.
### Creating PLC code generation report <a href="matlab:web('/tmp/BR2020bd_1444674_32127/publish_examples0/tpc9459b2d/ex15678560/plcsrc/html/fuzzyPID/fuzzyPID_codegen_rpt.html')">fuzzyPID_codegen_rpt.html</a>.
### PLC code generation successful for 'fuzzyPID/Fuzzy PID'.
### Generated files:
<a href="matlab: edit('plcsrc/fuzzyPID.exp')">plcsrc/fuzzyPID.exp</a>

By default, the software saves the generated code in the following location.

plcsrc/fuzzy_PID.exp