How to use Property nodes?

Hi everyone,
I am a beginner of LabVIEW. So I want to know about Property Node in detail. Please Please someone help me know the function of each property node......
Thank You in Advance,
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Achuthaperumal wrote:
I am a beginner of LabVIEW. So I want to know about Property Node in detail.
Property node allows you to programmatically read/write that particular property of associated object. For example, say you have a String Control, and you want to modify its 'Display Style'... for that you need to create and use that particular property node (of the String control).
Check the attached example.
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Attachments:
Example - Using Property Node [LV 2009].vi ‏11 KB

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How to show/hide sliders on a slider control using property nodes?

If I have a slider with multiple sliders on it how do I change which sliders are visible using property nodes? The only property I have found is making the entire control to be visible or not. This is a possible solution to have two different controls, one slider with only one slider and another slider with two sliders overlapped, but not desirable.
I found on a thread in the forum that it is possible but the user did not provide any specifics about which property it was. (http://forums.ni.com/ni/board/message?board.id=170&message.id=181279&query.id=34404#M181279)
I would appreciate an example VI if possible (Preferred version is 8.5 but versios 8.2, 8.0, and 8.6 are available to me).
Thank you in advance for the help,
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Just make them transparent! Here's a quick draft.
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How can I change the precision of a numeric array indicator using property nodes ?

I want to change the precision of a numeric array indicator programatically using property nodes. I tried to see all the array properties but I couldn't find it. URGENT !!!

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Attachments:
ArrayElementPrec.vi ‏27 KB

How do I remove lines from plot using property nodes

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To get rid of the line, set Plot interpolation = 0.
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How to set property nodes for each of the multiple y-axes?

In Labview 6i, I have set up multiple y-axes on an xy graph. I want to change certain properties of each of the 2 y-axes independently. I believe I can do this using "property node".
However, after I have created a property node for the xy graph, I realised that there is only 1 y-axis selectable from the list of properties. How can I set the property of the other y-axis then?
Thanks for the help!

I believe there is a property called "active graph"... this allows you to
select the active graph to apply the property changes to...
Later...
meng118230 wrote in message
news:[email protected]..
> In Labview 6i, I have set up multiple y-axes on an xy graph. I want to
> change certain properties of each of the 2 y-axes independently. I
> believe I can do this using "property node".
>
> However, after I have created a property node for the xy graph, I
> realised that there is only 1 y-axis selectable from the list of
> properties. How can I set the property of the other y-axis then?
>
> Thanks for the help!

Why is the first value missing in the Chart when I use Property Nodes to clear my Charts programatically ?

Hello everybody,
I am using Property Nodes to clear my Charts right at the beginning of the program. The Property Nodes (History) are outside a While-loop.
When I connect a Chart with the counter-variable "i" inside a While-loop, the first point I see in the Chart is (0,1) instead of (0,0). It looks like the Chart misses the first point !
If the Chart is outside the While-loop the Chart displays all points.
Can anyone please explain this behaviour ? How can I solve this problem ?
Thanks,
Cesar

Make sure you have the error output from the property node connected to
the loop border. Even if the error os not used in the loop, this will
ensure that the property node clears the chart before the loop starts
running.
What is probably happening is the loop start running at the same time
the chart is being cleared, so the first point is also being cleared.
Ed
Message Edited by Ed Dickens on 04-11-2006 09:50 AM
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.
Attachments:
Clear chart before loop.gif ‏4 KB

Why knob need to use property node to change its value

Refer boiler vi in CLD exam sample question.
In the vi the knob vlaue is changed with a property node, it is not wired directly to a constant. The comment in the vi is something like "writing using property node because of the latch action of the booleans in the cluster"...
Huh? How do the booleans influence the knob even though they are in a same cluster? What principle is this called? I need to google this up, I didn't read it in.
my Labview books.
Attachments:
Boiler Main LV86.zip ‏61 KB

That comment doesn't make any sense.
There are two main reasons I can think of why you want to use a Value property node.
1. You want to control the order of execution by using the error wire.
2. You want to use a property node on multiple controls by feeding it references to different controls.
Neither of these appear to apply in the screenshot you show.
However, looking deeper, it looks like you can set the value of a specific item in the cluster by way of the property node. Check out the Link to section of its shortcut menu. I don't think you can use a local variable to set a given element of the cluster. Now you could change the value of the entire cluster. Read the cluster, bundle the new value for that one element, write to a local variable of the cluster. But you won't be allowed to do that because of the latched booleans that are a part of the cluster. Hover over the context help of that property node and read the description there as well.

How to find Property Nodes in other VI's

I am working on an application that I have inherited from others. It has huge, and in my opinion, very complicated and difficult to follow block diagrams. Here is the essence of the problem I am facing. On the main front panel there are various controls and indicators, but on the block diagram, none of them are wired to anything. So that means that (whomever it was before me) used property nodes on these controls and indicators. However, it looks like none of the references exist anywhere within the same .vi.
I have used the "Find reference" selection, but that only seems to work within the current .vi that I am already in. So I guess I have two questions...
1 Is there a way to search aross multiple VI's for a reference to a conrol or indicator?
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Thanks....
Dan

Finding the where used cases for named queues and where obtained cases for vi server references to controls can get frustrating. The "find" feature in LabVIEW does allow text searches with several options.
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(DO NOT DO THIS) but I've seen it done:
Its "Legal" but almost garunteed to cause the guy who inherits your code to denigrate your parentage and intelligence. HOWEVER: that same text search for the control label text will find those string constants too.
Then document that code when you find out who is messing with what and how.
Chart it out over the app and e-mail that scribbling to the original developer too! Feel free to add a thank you note.
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Use property nodes to change the state of a boolean through time

I want to be able to switch the value from a boolean control, using property nodes, so that if the time elapsed is equal to 0,1 ,2 ,3 s, it should be false and if the time is equal o.5,1.5,2.5 s, the value should be true.
Can some one tell me how to do this with propert nodes or with any other method?
Thanks in advance!

-Check this link for ideas on how to make loop run for specific period of time.
http://forums.ni.com/t5/LabVIEW/how-to-make-a-loop-run-for-specific-period-of-time/td-p/1641018
-To change value using property node>>right click boolean>>create>>Property node>>value>> Change it to write.
-Forget about specific period of time, first learn to change the value of boolean programmatically.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
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Solved!
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the picture what I posted is a snippet. It is a png file which also contains a vi:
http://www.ni.com/tutorial/9330/en/
I have found this post. I am just reading it:
http://forums.ni.com/t5/LabVIEW/combobox-in-array-why-does-it-work-this-way/m-p/2146916/highlight/tr...
It might help...
hmm, it is more complicated as I thought )
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Problem scrolling using property nodes

What Im trying to do is a "fake scroll bar" using numeric controls and the VI Property FP Origin for the same vi where the numeric controls are. The problem is that when the vi is running and I use the scroll bar the controls also move and is a mess. I need to have it in a fixed (like floating) position within the window, how can I do that?

How about using a property node to move the control as you scroll so it
appears to remain fixed on a moving front panel?
"pacp" wrote in message
news:50650000000500000082D90100-1079395200000@exchange.ni.com...
> Hi,
>
> What I want to move is the entire front panel but one control (the
> fake scroll bar which is a numeric control) that is on it. What I
> really need is to have ONLY a vertical scroll bar... the way to do it
> doesn't really matter,
>
> Thanks

Use property node

When I right click on a property node or invoke and then click on help for +++ For example, click " Help for border" and notthing come up? How do I know how to use that specific property since there are so many in Labview.

It never works?
"Border" is a property I'm not familiar with, with which element is this connected?
A good one to verify is the 'bounds' property of an item (it is included in almost everything)
Maybe you didn't install the LV help files?
Ton
Message Edited by TonP on 10-13-2006 09:49 AM
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Attachments:
helpforprops.PNG ‏4 KB

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I am writing a WYSIWYG add-in for JDev that allows users to put some object into a JPanel instance.
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What are the alternatives to updating indicators using property nodes?

Hello,
I'm building a VI which needs to update several controls/indicators at multiple points throughout its execution. It also needs to be able to accept new values from the controls at any given time.
The problem with this is that all of these controls and indicators are on the front panel of another VI which is calling my VI. The current version of my program updates all of these controls and indicators using references and property nodes (each indicator/control that needs to be used has its own reference control on my VI, and these references are then sent into property nodes), which naturally makes it slow.
At the moment I'm considering rebuilding my VI in such a way that the main one is able to retrieve the data without using references, but this will be not only very time-consuming but also difficult and possibly even impossible without my code turning into a massive disorganized pile (especially since the lab computer is slow enough, and the main VI large enough, that pressing the 'clean/reorganize block diagram' button causes a crash).
Any alternatives to this? Queues?
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This (my Event nugget) is the best general solution I came up so far.
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How to use Property nodes?

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