Why does FIS wizard fail to auto generate blocks when the number of rules exceeds 500 in Simulink 6.6 (R2007a) ?

When I add a large number of rules (about 500) in a FIS, the FIS Wizard under Fuzzy Logic Controller toolbox fails to link the auto generated blocks to the block output. Is there a limitation on the number of rules that can be used in the FIS?

The error I encounter is this:

 Error in 'untitled1/Fuzzy Controller  with Ruleviewer/Fuzzy Logic Controller/FIS Wizard': Initialization commands cannot be evaluated.  MATLAB error message: Error using ==> add_block

 Input bounds are out of range.

Answer 1

[MathWorks Support Team]

This bug has been fixed in Release 2011b (R2011b). For previous product releases, read below for any possible workarounds:

Simulink block positions have been restricted to be less than 32768. This is mentioned in the documentation page below for the Position property of a Simulink block.

Common Block Parameters :: Model and Block Parameters (Simulink)

http://www.mathworks.com/help/releases/R2007a/toolbox/simulink/slref/f23-7517.html

In the Fuzzy Wizard block case this limit is reached with a very large number of rules. As a workaround, you can decrease vertical spacing between the blocks in Fuzzy wizard. You can do this by editing line 260 in 'fuzwizmask.m' in the '$MATLABROOT/toolbox/fuzzy/fuzzy' folder.

The original code is:

'y0 = y0 + dym1 + dym2 + 30;

You may change the space between blocks on 'y' axis from 30 to a smaller number to accomodate all the blocks.