simulink maximum step size warning

[Sungyun Jun]

I need some help about the simulink.
In the simulink, I saw the warning.
What is this?
TO solve the the warnign, what can I do for it?

Warning: Using a default value of 0.2 for maximum step size. The simulation step size
will be equal to or less than this value. You can disable this diagnostic by setting
'Automatic solver parameter selection' diagnostic to 'none' in the Diagnostics page of
the configuration parameters dialog.

[James Allison]

With default configuration parameter settings, this warning is displayed
for a variable step solver. You can eliminate this warning by specifying
the maximum step size yourself using the solver pane of the
configuration parameters dialog box:

http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/gui/bq7cmsp-1.html

Choose a value that is appropriate for the speed of the dynamics in your
system. For information on this selection please see:

http://en.wikipedia.org/wiki/Nyquist_frequency.

You can also change the diagnostic as described in the warning message,
but specifying the max step size manually is preferred.

-James

[Meryl Johns]

"Sungyun Jun" <jun...@gmail.com> wrote in message <hn399q$202$1...@fred.mathworks.com>...

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[Andrea]

About the variable-step, do you know if there is a way to get current step size in simulink while running a variable-step simulation ?

I need it because i'm using a s-function to implement a DT system, and the equations are function of delta_t.