MATLAB Central Newsreader - Making a step x seconds after a subsystem is enabled

Making a step x seconds after a subsystem is enabled

Kevin — Thu, 29 May 2008 11:25:04 -0400

Greetings

I want to use a step source in an enabled subsystem. The
problem is that I want the step to happen a certain time
after the subsystem is enabled.
Should I use a timer? Or is there a more simple way?

Re: Making a step x seconds after a subsystem is enabled

aasim Azooz — Thu, 29 May 2008 14:45:04 -0400

"Kevin " <kedecuyp@mathworks.com> wrote in message
<g1m3qf$qu3$1@fred.mathworks.com>...
> Greetings
>
> I want to use a step source in an enabled subsystem. The
> problem is that I want the step to happen a certain time
> after the subsystem is enabled.
> Should I use a timer? Or is there a more simple way?

use wait(time)
Aasim Azooz

Re: Making a step x seconds after a subsystem is enabled

Kevin — Thu, 29 May 2008 15:34:01 -0400

"aasim Azooz" <aasimazooz@yahoo.com> wrote in message
<g1mfhg$408$1@fred.mathworks.com>...
> "Kevin " <kedecuyp@mathworks.com> wrote in message
> <g1m3qf$qu3$1@fred.mathworks.com>...
> > Greetings
> >
> > I want to use a step source in an enabled subsystem. The
> > problem is that I want the step to happen a certain time
> > after the subsystem is enabled.
> > Should I use a timer? Or is there a more simple way?
>
> use wait(time)
> Aasim Azooz

I forgot to say that I'm using Simulink, so it doesn't work.
But thanks anyway

Re: Making a step x seconds after a subsystem is enabled

Devdatt Lad — Thu, 29 May 2008 17:54:27 -0400

> I want to use a step source in an enabled subsystem. The
> problem is that I want the step to happen a certain time
> after the subsystem is enabled.
> Should I use a timer? Or is there a more simple way?

Kevin,

You cannot use the Step source block in this case. Try using the "Signal
From Workspace" block in Signal Processing Blockset / Sources library and
specify the data as

[0, 0, 0, 0, 0, 1]

Select to "hold final value" from the popup box and set sample time to 1.
The step will now occur 5 seconds after the subsystem is enabled.

Hope this helps,
Devdatt

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Devdatt Lad
The MathWorks, Inc.