Is it possible to display in a front panel indicator the units name (for instance, N "Newtons" or ºC) from a virtual channel that you previously defined using MAX?

If possible, how can I do it?
Thanks in advance With LabVIEW 6 it is clear that we can display the DAQ channel name of previously defined virtual channels, so it seems to be possible that we would be able to access to other information defined in MAX as channel units name...
Thanks

Yes it is possible.
Locate the LLB:
LV folder\vi.lib\daq\dqchnutl.llb
There you find useful vis to handle virtual channel.
The Get DAQ ChannelNames.vi return also the channel units

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Lock front panel until the event case for this event completes

A Dynamic Event is a filtered event? Is this why "Lock front panel until the event case for this event completes" is not shown on Edit Event window dialog? I use Dynamic Event so I can subvi the event structure.
I need stop my app from locking the FP whenever the user double clicks on the numerical array value (<-- the FP freezes the mouse and renders it useless) and stops the value from ever being changed. This event is registered for Value Change (not mouse up or down) and I get a locked mouse. As yet in the UI, no value changed occurs but I get a locked mouse. A LV bug?
Trying to KISS, I can see this fixing this by moving ONLY the value change event to the top level VI instead of a dynamic registered event in a subVI. This will give me the option to NOT "Lock front panel until the event case for this event completes" .
Solved!
Go to Solution.

richjoh wrote:
Thx, Ben that fixed the problem when I unchecked "Lock panel...".
So it appears LV locks the panel during runtime once the Dynamic Reg Events is on BD and it doesn't matter if your case to handle the Reg Events is created or NOT... interesting. That's why my mouse persisted to "freeze up" although I deleted the case for my FP array.
Its situation like what you described that has given me many insights into how LV actually works. In one of my bbuggy VI's I found that a class wire can run a million miles through multiple sub-VI queues etc but the data itself is only touched when it has to be touched. in my case it was a crash while trying to write bogus class dat to a TDMS file.
I am glad you are back on course.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Maximum Character size of Front Panel indicator in LabVIEW

Hi,
I have a simple question that I hope somebody can answer. Is there a maximum character size that can be displayed in a Front Panel indicator in LabVIEW? If so, what is it? I have a VI that is continuously reading a serial port and updating a front panel indicator, and I need to know how much text can be displayed before it either truncates or throws an error. This is for LabVIEW 2010 SP1.
Thank you,
J Korn

A quick Flatten to string shows how LabVIEW stores strings {size-data} Size is a U32 so 4294967295 characters max.
The big thing to remember is this memory must be contiguous (and the Indicator requires a COPY) so in practice the performance hit for constantly allocating larger and larger buffers for the data and available memory impose practical limits much lower than the 4294967295 Char maximum. Probably better to log the data to a file and maintain only the last x characters on the indicator and use the file to look a history data
Jeff

Is it possible to display only dynamically selected fields in the out put?

Is it possible to display only dynamically selected fields in the out put? i need to display set of columns in the selection criteria, but in the output i have display only input given fields. because i need to convert it into .csv file. So i have to display selected fields from internal table. In oracle they are using"execute immediate". is there any equivalent in SAP?
thanks in advance.

Hi Remya,
Are you talking about dynamic programming in ABAP ?
If yes, there are concepts like RTTS which facilitates it.
Yes, the select query also supports dynamic selection of fields. ( Please care about ( ) in dynamic sql ).
Do more research on Field Symbols and statements like ASSIGN COMPONENT OF.
Regards,
Philip.

How can I display the front panel of the dinamically loaded VI on the cliente computer, the VI dinamically loaded contains files, I want to see the files that the server machine has, in the client machine

I can successfully view and control a VI remotly. However, the remote VI dinamically loads another VI, this VI loaded dinamically is a VI that allows open others VIs, I want to see the files that contains the server machine, in the client machine, but the front panel of the dinamic VI appears only on the server and not on the client, How can I display the fron panel with the files of the server machine of the dinamically loaded VI on the client computer?
Attachments:
micliente.llb ‏183 KB
miservidor.llb ‏186 KB
rdsubvis.llb ‏214 KB

I down loaded your files but could use some instructions on what needs run.
It seems that you are so close yet so far. You need to get the data on the server machine over to the client. I generally do this by doing a call by reference (on the client machine) of a VI that is served by the server. THe VI that executes on the server should pass the data you want to diplay via one of its output terminals. You can simply wire from this terminal (back on the client again) to an indicator of your choosing.
Now theorectically, I do not think that there is anything that prevents use from getting the control refnum of the actual indicator (on the server) of the indicator that has the data, and read its "Value" using a property node. I have never tried this idea but it seems t
hat all of the parts are there. You will need to know the name of the VI that holds the data as well as the indicator's name. You will also have to serve all VI's. This is not a good idea.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How can I display a changing variable in a subvi on the front panel of the main vi as the subvi is excuting

In the document attached the vi on the right is sub to the vi on the left. On the subvi on the right the variable "Field Reading" is continuously updated on the front panel of the subvi as the "for" loop is executed, but only the last value of the variable is updated on the main vi front panel which is what is expected. My question is how can I display the changing value of "Field Reading" on the main vi front panel as the "for" loop in the subvi is running?
Thank you.
Solved!
Go to Solution.
Attachments:
Doc2.docx ‏554 KB

Hopefully I can explain it well enough. It really is simple.
1) Create an empty global variable and call it something like User Interface References.vi
2) For each and every control and indicator on your front panel, right-click and select Create/Reference
3) Place these references wherever you like (I use a series of Event cases to perform my initialisation and these all live in one of these event cases). They can be placed anywhere in the main vi.
4) For each of the references, right-click and select Create/Indicator
5) Moving to the front panel, Cut all the indicators and Paste them in the global variable (eg. User Interface References.vi)
6) Moving back to the block diagram, wire the global variable to each of the references and select the same named global variable.
All the hard work is now done (until you add another user interface terminal). You should now have something that look as shown below, [except the reference labels would be to the left (not sure why the snippet put them above)]. In my latest program I have 82 references!
Done. You can now access all your front panel controls and indicators anywhere in your program as shown below.
You can just select Value in most cases, but in this particular case I wanted to fire off an Event to do some things (log the alarm) as well as just update the value. So, this is another bonus with the method.
Hopefully this all makes sense. If not, let me know.

How to change front panel indicator properties such as background color or enable/disable programmatically?

Is it possible to change the properties of a front panel indicator such as background color or to change from enabled to disabled-grayed out programatically in response to limit conditions or a time-out?

"Disabled" means that the control/indicator will not respond to a user operation. However, the displayed data can still change. What you want to do can be easily achieved using a case structure : wire your boolean to the case input, and put your indicator in the "True" case condition. That way, it will be updated only when the digital input is set to true.
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Using more than one front panel at the same time

I have a main program where I can call sub vi’s and then the sub vi’s front panel opens.
I want to use/see/operate more than one front panel at the same time. How I can do it?
For example when I close the main program it won’t close before I close all the sub vi’s front panels.
I use event case to call these sub vi’s. Can I close all vi's using one button?

I wouldn't use subVIs for display, at least not if you plan to have them open all the time. Instead, I would suggest that you have one loop with a FP VI which will talk to the FP all the time and will pass to the data to the other loops through a variable or a functional global.
Then, you can use a tab control to organize your display. If there is no specific reason for not having the graphs in the same VI, you can use a tab control to organize it. If you can't, you can also use subpanels to display the VIs and put several subpanels in your VI.
If you still want to display the VIs seperately, you can control their positions and sizes through their proerty nodes, but I don't think there's any reason for this.
To learn more, I suggest you read the LabVIEW style guide. I think it has some tips about application design.
Try to take over the world!

Is there a way the user can change the equation in the formular node from the front panel on the fly, dynamically?

Is there a way the user can change the equation in the formular node from the front panel on the fly, dynamically?

Sorry, I don't think so. That would be pretty cool if you could create a property node for a formula node and then enter a formula on the front panel and use it to update the formula. But you can't create a property node for a formula node and the only way of modifying the formula is by typing it into the formula node on the diagram. And you can't modify a diagram of a running VI.
You could create a VI which is only a formula node with the maximum number of inputs and outputs you expect. Have a button on the calling VI to Edit Formula. When the button is pressed, use a VI server to display the front panel on the formula VI, display a dialog box telling the user how to display the diagram of the formula VI, then stop the calling VI. (You can't edit a sub-VI while t
he calling VI is running). The user will then need to rerun the calling VI to use the new formula.
You might be able to do something by calling MatLab or something like that to get an interactive formula window.

Imitate boolean switch behavior using an event structure on a front panel indicator

Hi,
I am looking for a possibility to imitate the bevhavior of a boolean switch with an event structure. To be more precise, I want a boolean value to change each time I click on the front panel indicator and then remain constant until I click again. I have not worked with shift registers in a while loop yet, but could this be a way to find a solution?

LordSnow wrote:
Okay, I figured it out, BUT I still have a problem. Before I first trigger a mouse event on the front panel indicator, I already need the case structure to be executed once. Therefore I assume that I need some kind of default value, but since the event structure does not create any output at first, I have no idea how to do that.
Are you talking about the shift register you just created? You can while in a default value on the left shift register ndoe. It is wired outside of the loop.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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HT1438 How long does it take to repair a broken front panel of the iPhone 5 at the apple store?

How long does it take to repair a broken front panel of the iPhone 5 at the apple store?

apple doesnt fix them they switch them out

Is there a way the user to change the equation in the formular node from the front panel on the fly, dynamically?

Is there a way the user to change the equation in the formular node from the front panel on the fly, dynamically?

Try the Parser VIs (also known as LV Mathematics VIs, or simply GMath VIs) located under the Analyze>>Mathematics palette (not in the Base package). You might want to start with the "Eval Formual Node.vi" located in the Analyze>>Mathematics>>Formula palette. There are many differences between these G-based, dynamic formula VIs and the LabVIEW formula node, but these VIs often prove quite useful when your formula changes on the fly. For more detail on the differences, see the LabVIEW Help file (Cntrl-Shift-? from within LabVIEW) under the topic "Mathematics VIs, parser differences with Formula Node".

How to make the LV front panel controls the current value through the program is set as the default value when the next time you open?

How to make the LV front panel controls the current value through the programis set as the default value when the next time you open?
1110340051

Try this: Re: How to make a VI remember the latest control value?
Jim
You're entirely bonkers. But I'll tell you a secret. All the best people are. ~ Alice

I am trying to create an executable vi that will call out another vi and show its front panel in the executable. When I try this I recieve this error message "top level vi (my main vi) was stopped at unknown on the block diagram of (my sub vi)

I am trying to create an executable vi that will call out another vi and show its front panel in the executable. When I try this I recieve this error message "top level vi (my main vi) was stopped at unknown on the block diagram of (my sub vi)

Well the most common way is to enclude the vi's in the build spec either directly in the dependancies that the App builder automatically generates OR by declaring them in the build spec as "additional enclusions" (like you must do for dynamic vi calls in your app.
I have heard rummors about My.app Stuff.vi in a nugget Intaris posted- and I've wanted to dig deaper into Intaris' claims- but have not tried it myself.
If you go down the stuff.vi route Keep us curious guys posted
Jeff

How to active more than one front panel in the same application ?

Hello,
I want to active several front panels in the same application. I am a recent labview's user and it's difficult to solve this question.
Thanks for your help.
Regards

But, each VI, including each subVI has a front panel. If you want several front panels, that implies using several VIs. The top level VI will call the appropriate subVI. Each subVI that you need as a UI can be set to 'Show front panel when called' and 'close afterwards if originally closed'. These settings can be accessed through popping up on the VI's icon and selecting VI Properties..., then selecting Window Appearance, then selecting the customize button or the dialog radio button.
Hope that this helps,
Bob
Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
DISTek Integration, Inc. - NI Alliance Member
mailto:[email protected]

Is it possible to display in a front panel indicator the units name (for instance, N "Newtons" or ºC) from a virtual channel that you previously defined using MAX?

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