The real-time simulation is working with a fixed step 'Solver'. The 'Solver' must be configured under the 'Simulation/Configuration Parameters.. (CTRL+E)'.
The model should be checked whether it runs correctly with the selected fixed step 'Solver' and fixed sample time.
The following solver options must be selected:
Type: Fixed-step (required)
Fixed step size: Value smaller or equal to the smallest block sample size
All sample times in the model must be an integer multiple of the 'Fixed-step size'.
Tasking mode: Single Tasking (required)
Tip: The model will run with the selected fixed sample time on the real-time target.
If you need different block sample times, e.g. the sample time of your I/O hardware is lower than the fixed-step size you must include 'Rate Transition' blocks into the model. The 'Rate Transition' blocks are located in the MATLAB®/Simulink® Library (Browser/Simulink Library/Signal Attributes/.).
The yellow block in the following figure illustrates a 'Rate Transition' block. In this example the DAQ-Card is running with 50ms whereas the model is running with 1ms.
Tip: The start values of the IN blocks will be zero at simulation start on the real-time target. Ensure that this cannot cause critical system behaviour.