Simulink Fixed Point Advisor

I recently got Simulink fixed point toolbox and I opened up my project and it opened fine the first time. I did a couple changes to my design and when I tried to open it again it gives the error:

"Fixed point advisor does not support library systems/subsystems"

I opened one of the demo files for simulink and I could open the advisor just fine there. Is there a setting I managed to change within the first 2 hours of owning this tool?

Answer 1

[Nirmal Gunaseelan]

The Fixed-point advisor can only be used from a model or subsystem in the model that is not linked to a library. If your model contains contents linked to a library, try de-linking them before using FPA. Did you add a library during your changes?

[Steven]

I am using custom library blocks for the majority of my Simulink system. The system is very large so I thought the best approach to get the best accuracy on my end results would be to use the fixed point tool to decide the best fraction length that would properly propagate through the system without violating set tolerances.

[Nirmal Gunaseelan]

Sure, but FPA has a limitation with regards to a Library. The prescribed data types cannot be propagated back to the library as long as you are using blocks in your model that are "copies" linked to the library. So, the only way ahead I could think of is to de-link your blocks from the custom library and then use the Fixed-point advisor.