None of the operating systems that MATLAB is supported on (Windows, Mac, Linux) are real-time operating systems, so there is no absolute guarantee that you will receive a value every 10 seconds, but if your equations are relatively quick and can be computed in well within 10 seconds, you can try the MATLAB Central submission: Simulink® Real Time Execution to slow down the execution of the Simulink engine to match that of the system clock. Again, remember that this does not give you a "hard" real-time system.
The usual products that we recommend for real-time processing of Simulink models are xPC Target and Real-Time Windows Target.