Run Vi from the front panel...

I'm trying to run a vi, but not from a run botton, and not even by the execution properties. I'd like the vi to run when i turn on same logic botton on the front panel. Is it possible? Thaks, sorry for my bad inglish. Obrigado.

It is possbile to selectively run a vi using the VI server. I guess in your case you will still need to run a main to control the logic button. Check here for more information.

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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.

How can we run reports from the front enf of iProcurement...

Hi Guys,
I need to create a link to run reports from the front end in iProcurement webpage instead of using apps SRS to run the report...
help needed...
thanks
aman

Hi Tapashray,
That was a great help. Thank you so much. A few more clarifications needed sir..
I refered to a previous link and came to know about a prcedure he followed for a report. So is it the same way that is to be done... I pasted a descr what he said in the thread. In ur solution, you said, have a link bean. what do u mean by that. After i go thru all the steps what this guy told.
It would be of gr8 help if you kindly look in to this for one more minute sir..
thanks
Creating a new report in 11.5.9
Re: Creating a new report in 11.5.9
Posted: Mar 11, 2005 7:12 PM in response to: dhergert Reply
Ok, I was able to figure out the functions that were confusing me. For my own record and for those that do not know, I will list how to create the objects necessary to add a new report to a menu.
1-Write JSP (should be written just how Oracle writes theirs)
2-Creat function for the new JSP page as System Administrator responsibility
3-Use Sys Admin to add the function to a menu somewhere
4-Using AK Developer responsibility, create an attribute with the label of the attribute being the name of your function you created. Oracle's convention is the name of the attribute has FS in it.
5-Using AK Developer, lookup the ASF_FUNC_SEC_REG region
6-Drill down into that regions attributes
7-Add a your newly created attribute to this region

What is the best way to zero a 'custom voltage with excitation' sensor from the front panel?

What is the best way to zero a 'custom voltage with excitation' sensor from the front panel?
Thanks for any help

Hi Donavan,
There are two options for zeroing with the NI-9237. You can perform offset nulling and shunt calibration with a strain task, or if you use custom excitation you can use software compensation.
See the Bridge Balancing, Offset Nulling section in the Load, Force, and Torque Measurements tutorial. Take a measurement before the strain is applied and subtract this from all subsequent measurements. See the above tutorial to consider the tradeoff in accuracy between these two options.
Hope this helps,
Jennifer O.
Applications Engineer
National Instruments

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".

I am having trouble stopping a sub VI from the front panel of my main VI.

Whenever I try to stop my sub VI from the main panel i cannot get it to work. It has entered the value of the switch from the main VI and does not update it within the sub VI after it has started the sub VI and hence does not look for a changed value on the switch. Is there any way that I can get the sub VI to check the state of the switch on the Main VI on each loop?
Thanks
Ross H

Hi,
I am including 3 VI programs, here main vi controls the sub vi, i mean sub vi can be stopped either from main vi or from stop button put on its front panel. Also main vi still works incase sub vi is running.
Hope it works. If above does not answer your problem completely, Pl. do write.
Best Regards,
Nirmal Sharma
India
Attachments:
Main_Vi.vi ‏56 KB
sub_vi.vi ‏25 KB
global_stop.vi ‏6 KB

A control that would allow the choice of different VI%27s from the front panel%3F

Hi guys,
I am fairly new to Lab View and I have made a few VI's for my coursework. From the control panel i want a control that would allow me to toggle between the different VI's. I have looked at the ENUM function but it doesnt quite do it for me. Any suggestions about any functions or tools would be much appreciated.
Regards,
Jack.

Hi jack33,
- Any idea why Enum function doesn't suit you? So, that we can have better understanding of your problem.
-Quick suggestion would be to use, enum or menu ring and simple case structure.
-The other idea is to have an event structure and bunch of boolean controls for each vi and open them in appropriate events.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

How to run my vi from a front panel control without using even structure in the vi

Hello, I would like to run my vi from a front pannel control instead of the tool bar RUN botton. I am using LV6.1 without the even structure feature, so I can't do as proposed by a previous posting by setting the vi to run at open in a "do nothing state" then taking the front panel control event and switching the vi into another ("running") state. I wonder is there some other type of solutions to this problem. Your help is greatly appreciated.
Bryan

Hi Dennis, thank you for the reply. I tried with the attached vi. It can only run once (also not in the correct state I want), as the control i placed on the front pannel will stop the VI. I want to have the vi do nothing when it is opened and start counting when the start botton is pressed. Then i want it stop counting when the botton is pressed again...and so on... I must need a different structure to get it work, or did I miss something simple? Thanks again.
Attachments:
StartVI.vi ‏16 KB

I have a VI and an attched .txt data file. Now I want to read the data from the .txt file and display it as an array in the front panel. But the result is not right. Any help?

I have a VI and an attched .txt data file. Now I want to read the data from the .txt file and display it as an array in the front panel. But the result is not right. Any help?
Attachments:
try2.txt ‏2 KB
read_array.vi ‏21 KB

The problem is in the delimiters in your text file. By default, Read From Spreadsheet File.vi expects a tab delimited file. You can specify a delimiter (like a space), but Read From Spreadsheet File.vi has a problem with repeated delimiters: if you specify a single space as a delimiter and Read From Spreadsheet File.vi finds two spaces back-to-back, it stops reading that line. Your file (as I got it from your earlier post) is delimited by 4 spaces.
Here are some of your choices to fix your problem.
1. Change the source file to a tab delimited file. Your VI will then run as is.
2. Change the source file to be delimited by a single space (rather than 4), then wire a string constant containing one space to the delimiter input of Read From Spreadsheet File.vi.
3. Wire a string constant containing 4 spaces to the delimiter input of Read From Spreadsheet File.vi. Then your text file will run as is.
Depending on where your text file comes from (see more comments below), I'd vote for choice 1: a tab delimited text file. It's the most common text output of spreadsheet programs.
Comments for choices 1 and 2: Where does the text file come from? Is it automatically generated or manually generated? Will it be generated multiple times or just once? If it's manually generated or generated just once, you can use any text editor to change 4 spaces to a tab or to a single space. Note: if you want to change it to a tab delimited file, you can't enter a tab directly into a box in the search & replace dialog of many programs like notepad, but you can do a cut and paste. Before you start your search and replace (just in the text window of the editor), press tab. A tab character will be entered. Press Shift-LeftArrow (not Backspace) to highlight the tab character. Press Ctrl-X to cut the tab character. Start your search and replace (Ctrl-H in notepad in Windows 2000). Click into the Find What box. Enter four spaces. Click into the Replace With box. Press Ctrl-V to paste the tab character. And another thing: older versions of notepad don't have search and replace. Use any editor or word processor that does.

Is there a way to use the built-in Datalogging and programmatically log the front panel while the vi is running?

I would like to use the built-in Data Logging feature. There is the "Log at Completion" option, but is there a way to programmatically make a new log record while running? I looked around in VI server and couldn't find any methods that would do that. Currently, I am grabbing all of the front panel control references using VI Server and if there are any changes, the changed values are written to a log file along with a date/time stamp. I'm mostly dealing with buttons, which simply change from 0 to 1 or 1 to 0, so it's not too hard to visualize what was pressed. It works okay for reconstructing what happened, but it would be much nicer to use the built-in fe
ature because you can "replay" directly onto the front panel and actually see what the changes were. However, without being able to programmatically make a new log, it won't work for me.

Jake,
There are several options here.
I would suggest using your own code for datalogging. The datalogging you are referring to is primarily for debug, and one shot datalogs of front panel indicators (and controls?), not including graphs, etc.
If you go to the file functions, you will see a menu for datalogging. These functions will allow you to save your data, as you need it, simply, and in a compact format.
I recommend opening the datalog file, doing all your file operations, and closing the file before the program is complete. There are several examples of this in the examples database.
Good luck

I want to save an image of the front panel, (with data), after every VI run

When I try to copy the front panel (using a select all), and paist to paint, all the data in the graphs show up as they did after the last run, but the data in the charts dissapear. The chart itself is copied but the data is not. Any ideas on how to solve this?
Thanks,
Brian
Attachments:
Brians_graph_compilation2.vi ‏1363 KB

This Knowledgebase also has some information on programatically saving VI images
http://digital.ni.com/public.nsf/websearch/942DAA35C7B35616862565FE005F713F?OpenDocument
(KB 197BB7VJ if the link doesn't work).
Note that you don't have to put the code in the VI you are running in order to save it to a file, so you don't actually have to modify your VI. You can just run a seperate VI that uses the VI name from the first one (I've attached a VI which could either be run standalone or used as a SubVI, as well as an example of using it as a SubVI).
If you don't want to do it programatically you could just hit the print screen button on your keyboard and then paste it into paint and crop off the extra windows stuff.
Attachments:
CreateVIJPEG.vi ‏34 KB
ImageExample.vi ‏24 KB

Hi i am new to labview. i want to extract data from a text file and display it on the front panel. how do i proceed??

Hi i am new to labview
I want to extract data from a text file and display it on the front panel.
How do i proceed??
I have attached a file for your brief idea...
Attachments:
extract.jpg ‏3797 KB

RoopeshV wrote:
Hi,
The below code shows how to read from txt file and display in the perticular fields.
Why have you used waveform?
Regards,
Roopesh
There are so many things wrong with this VI, I'm not even sure where to start.
Hard-coding paths that point to your user folder on the block diagram. What if somebody else tries to run it? They'll get an error. What if somebody tries to run this on Windows 7? They'll get an error. What if somebody tries to run this on a Mac or Linux? They'll get an error.
Not using Read From Spreadsheet File.
Use of local variables to populate an array.
Cannot insert values into an empty array.
What if there's a line missing from the text file? Now your data will not line up. Your case structure does handle this.
Also, how does this answer the poster's question?

Can I Run a labview application in a hidden window (i.e. I don't want the front panel to pop up in this Labview created EXE)?

I have a executable labview 6.1 program with a front panel. The front panel pops up every time I run it. Can I force the program to run without popping up its front panel.
Thanks in Advance

If you're using MS Window, you can use lvwutil32.zip to hide the front panel. lvwutil32.zip can be downloaded from NI site.
Or you can move your front offscreen, so that user can't see it. And save your vi. When you run your vi again, it'll popup at the offscreen position. NI uses this trick to hide windows from LabVIEW users. You can also set front panel size to 0.
George Zou
http://gtoolbox.yeah.net

How to programmatically load and show the front panel of a vi but NOT run it?

Is there a way to load and show the front panel of a vi but NOT run it? I am starting with the AsynchronousCallAndForget.vi from the example finder and inserted an invoke node with the FP Open method call prior to the Start Asynchronous Call node. The vi I am loading has the "Run when opened" unchecked and the menu bar IS visible so I can manually click the run arrow. Thanks!
Solved!
Go to Solution.

Why are you using the Async call? If you simply open the VI reference, then call the FP.Open method this works fine. You can then call the VI run method with Wait Until Done set to false if you wish to run it Asynchronously, this is how we did it in ye olde days before we had this new fangled "Start Asynchronous Call" stuff.
Charles Chickering
Architecture is art with rules.
...and the rules are more like guidelines

When I call an external program from Labview, how can I embed the interface into the front panel?

I'm running Labiew 6i for Linux. I'm using a system exec.vi to call an external program to do image manipulation (since there is no IMAQ for linux). How can I embed the user interface of the external program into the front panel of Labview?

As far as I know, the only way to embed other GUIs in LabView is an ActiveX in a container.
As long as you are using Linux, try to place (moving them on the desktop ) the two windows linked (like those 3 of WinAmp).

Run Vi from the front panel...

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