Even better! In Simulink, you don't need to convert your plant model to a discrete system.
If your controller block(s) are discrete, you can pass them directly into continuous block(s), so you truly have a discrete input acting on a continuous-time plant. This may be preferred to the MATLAB approach which forces you to discretize your plant model to the same rate of the controller.
For example, try connecting a Discrete Transfer Fcn block to a Transfer Fcn block. You can also check the block sample times in the Simulink menu under Display > Sample Time > All.