Tolerances on Simulink Blocks

I want to be able to specify exact tolerances on Simulink Blocks. I want to be able to specify more than just the min/max. I need to be able to say for a specific block to be accurate to "x" bits and/or be accurate to a certain %. I am using the simulink Fixed point toolbox as well, but in that you can only specify a tolerance in % and for the entire design. I have been looking all throughout and cant find a nice way to do this. Any help will be much appreciated.

Answer 1

[Brenda]

Currently, Simulink does not provide such capabilities to support tolerance specifications.

Using Data Type Assistant and Fixed-Point Details panel could help you. By selecting different fraction lengths, you can check in the "Fixed-Point Details" to see if the "Precision" is acceptable.

Could you please describe your need why such specification is more convenient for you than the existing methods?

Thanks.

[Steven]

For my current project I have for each block a specific range (which is fine to implement) and for most I have a specific tolerance that the block has to meet. I also have another tolerance for the entire system. So the option in the fixed point tool to specify a tolerance for the entire design is nice. However, I would like to have that feature for every single block. I also have to specify tolerances for inputs as well which I haven't been able to find in Simulink either.

This project has very clearly defined specifications and everything needs to be as specified. This project is also on a large scale, lets say 300 + simulink blocks, so to manually go through and write a script for every block to ensure it is within that blocks specific requirements is not feasible.