Using a Variant Subsystem - 2025.2 English - UG1483

To use a Variant Subsystem in your design after implementing its variant selections, follow these steps:

1. Create the variant subsystem and insert it into the design at the appropriate location.
   
   
2. Right-click the variant block and select Block Parameters. The Block Parameters dialog box for the variant block opens.
3. To select the active Variant based on the evaluation of the Variant conditions, use the expression mode. Otherwise, select label mode.

   When you select the Variant control mode as label, the Label mode active choice option becomes available. In label mode you do not need to create Variant control in the global workspace. You can select an active Variant choice from Label mode active choice options.

4. Use the options available on the Block Parameter dialog box to add variant controls and corresponding variant conditions.

   The following figure shows an example configuration for expression mode:

   
5. To activate a variant selection, type the variant name in the MATLAB® command window. For example, type VSS_MODE = 2.
6. Update the model (Ctrl+D) to ensure that the variant selection is activated.