The screenshot you included shows port value labels on the model to display the signal values. Have you tried running a simulation and looking at a plot of the data?
Port value labels show instantaneous values and also round the value to MATLAB's short numeric format by default. It's possible that the value isn't literally zero, just very close based on the transfer function values and the dynamics of the input signal.
You could try looking at the data over time for a simulation or changing the port value label settings to display the data using more significant digits or a different format. To change the format for the port value labels:
- In the Simulink Toolstrip, on the Debug tab, in the Tools section, in the Port values button group click the button arrow for Remove all port value labels. Then, select Options.
- In the dialog box, use the options in the Display Format section at the bottom to specify the display format based on whether the data is fixed-point or not.
These settings aren't saved with the model.
I hope this helps!
