This example shows that if the analysis cannot derive range information because there is insufficient design range information, you can fix the issue by providing additional input design minimum and maximum values.
At the MATLAB® command line, enter:
The model displays the specified design minimum and maximum values for the blocks in the model.
The Inport block
In1 has a
design minimum but no specified maximum value, as shown by the
The Gain block has a design range of
The Outport block
Out1 has no
design range specified.
To display design ranges in your model, in the Debug tab, select Information Overlays > Signal Data Ranges.
From the Simulink® Apps tab, select Fixed-Point Tool.
In the Fixed-Point Tool, under System Under Design (SUD),
ex_derived_min_max_4 as the system you want to
Under Range Collection Mode, select Derived ranges.
Click the Collect Ranges button.
The Fixed-Point Tool displays the derived minimum and maximum values for the blocks in the
model. The range analysis is unable to derive a maximum value for the
In1. The tool highlights
To fix the issue, specify a design maximum value for
In the model, double-click the Inport block,
In the block parameters dialog box, select the Signal Attributes tab.
In this tab, set Maximum to
1 and click OK. To
update the diagram, press (Ctrl + D).
The model displays the updated maximum value in the block
Click the Collect Ranges button again to rerun the range analysis.
The range analysis can now derive ranges for the Inport and Gain blocks.
Uses specified design range on the block.
The design range specified on the Gain block is
Same as Gain block output because there is no locally specified design range on Outport block.