I cannot observe or tune some parameters in the real-time application.
Reasons that you cannot observe or tune some parameters in the real-time application are:
Simulink® Real-Time™ does not support parameters of multiword data types.
During execution, you cannot tune parameters that change the model structure, for example by adding a port. To change these parameters, you must stop execution, change the parameter, and rebuild the real-time application.
Check the parameters for the issues described in What This Issue Means.