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In lugnet.robotics.rcx.robolab, Elizabeth Mabrey wrote:
> Hi Tom,
>
> Just for my education purpose, I'd like to understand the difference
> between the "begin" & "end" control boxes at the "Front Panel" window.
> Although they look identical, they must be different since they failed to
> wire to the blocks next to them once I switched them at the block diagram
> window (the program window).
In a LabVIEW program (vi) there is a front panel and a block diagram. The front
panel is the user interface and contains both controls and indicators. When you
place a control/indicator on the front panel a corresponding terminal is created
on the block diagram. In the block diagram, data is read from the control,
"flows" through whatever logic you have created, and then is written to an
indicator.
When this same program is used as a sub.vi, the calling .vi writes data to the
controls of the sub.vi's front panel and reads data from the sub.vi's
indicators.
Now, getting to your question, although begin and end look identical one is an
indicator and one is a control. If you right click (control click for fellow
Mac users) on the border of each control/indicator, you will have the option of
changing a control to an indicator and vice versa.
I hope this make some sort of sense...
Tom
> --thanks
> E
> > -----Original Message-----
> > From: news-gateway@lugnet.com
> > [mailto:news-gateway@lugnet.com] On Behalf Of Thomas Johnson
> > Sent: Sunday, January 16, 2005 4:01 PM
> > To: lugnet.robotics.rcx.robolab@lugnet.com;
> > lugnet.robotics.rcx@lugnet.com
> > Subject: Re: sub-vi begin vs end control
> >
> > In lugnet.robotics.rcx.robolab, Elizabeth Mabrey wrote:
> > > Hi,
> > >
> > > After a sub-vi is created, there are two controls created namely begin
> > > and end. Would someone explain why they are backwards? That means,
> > > it creates an "end" control linked to the beginning of the sub-vi,
> > > while the "begin" at the end.
> >
> > It is a leftover from LabVIEW. When you create a sub.vi,
> > LabVIEW reuses the name of whatever is wired to the
> > control/indicator. This behavior makes perfect sense in
> > LabVIEW but much less so in Robolab. FWIW, the names are
> > little more than labels and you can change them as you see fit.
> >
> > Tom
> >
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