Unlocking front panel

Is there a way to unlock a front panel with no menu items available?

Create a new VI.
Drop the offending VI on the BD of the new.
do a "ctrl-double-click" of the icon you just dropped.
If the VI is not locked and it has a diagram, that should show you the diagram.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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Unexpected effect of Lock Front Panel in Event Structure

I have been using LV intensely for only a short time, although I have dabbled with it many times since its first appearance. The "problem" that I have had may well be the intended behaviour, but it just seems unintuitive to me. I'm writing a small application to take measurements from a USB instrument. I have already written a basic driver for the instrument, which the application calls, and the driver is working as expected. In the application, the user can configure various settings and then click an Execute button to transfer them to the instrument. The click event is handled in an event structure along with other events. Since some of the instrument operations take an appreciable time, the first action that occurs in the click event case is to disable the Execute button using a property node so that further clicks are ignored until the operation completes, at which time the button is re-enabled.
When disabled, the Execute button is grayed out as expected and clicking it has no visual effect. However, it seems that clicks made during the disabled period are still queued and acted upon when the button is re-enabled, causing the operation to be repeated.
It is the solution I have found that seems unintuitive to me. The Lock Front Panel check box was checked (by default) for the click event, and I assumed that this would be the correct setting. However, unchecking the Lock check box actually makes everything worked as expected. Click events occurring during the disabled period are now ignored or discarded. I'm not suggesting that this is a bug, but I'm interested to learn why it happens, if anyone can explain. I have attached a picture of a simplified version of the event case.
Attachments:
Sample.png ‏7 KB

I would say what you see is expected behavior, even though it's a bit complicated.
The "Lock front panel until the event case for this event completes" option will only defer clicks and other things generating events until the current event handler completes. So this means that the click is placed in a queue and only evaluated once the event is finished. At this time, the button is no longer disabled, so an event is generated.
When the "Lock front panel until the event case for this event completes" is not checked, the click is immediately evaluated, but it's happening on a disabled control, so it does not generate an event.
From the LV help:
By default, when an event enters a queue, LabVIEW locks the front panel that contains the object that generated that event. LabVIEW keeps the front panel locked until all Event structures finish handling the event. While the front panel is locked, LabVIEW does not process front panel activity but places those interactions in a buffer and handles them when the front panel is unlocked.
Note If an event case that locks the front panel takes a significant amount of time to execute, consider using the Set Busy function or displaying a dialog box to notify the user that the front panel is locked.

How to lock block diagram alone from editing leaving front panel for editing?

i want to lock block diagram from editing but front panel can be edited for creating controls, moving controls editing properties...

executables will be delivered to customer and they can create new vi and edit frontpanel and link tag through databinding. but i dont want them to open block diagram...
Natasftw is right - you seem confused about the difference.
If the customer can "create a new VI and edit frontpanel" then they have to have LabVIEW Development System.
If you give them an EXE, and they don't have the DevSys, then they can use your VIs, but not edit them or look at the code.
If they have the DevSys, then they can edit your VI and look at the code, UNLESS you protect it.
If you save a VI with protection (VI PROPERTIES - PROTECTION ) then you can LOCK it (user has to explicitly unlock it with an extra step), or you can PASSWORD PROTECT it (user has to explicitly unlock it by giving a password). Either way requires the DevSys.
There is no situtation where one can edit the front panel without being able to edit the block diagram.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
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Why does refreshing my web browser page increment the number of users connected to my Remote Front Panel?

Hi,
I'm using LabVIEW 2010 and a cRIO-9118 to broadcast my RT Front Panel on the web with a Web Server.
I successfully configured the web server to be able to control my Front Panel remotely. However, I have an issue with "Refreshing" the browser.
When I press "Enter" to search the adress of the web server, the number of users connected seems to increment by one and then tells me that "Too many users are connected to the front panel". Once this has been done, the only way to "unlock" the web server is to reboot the cRIO.
Is there any solution to avoid this behavior?
My current web browser is Internet Explorer 8.
Thank you
Mathieu Veillette, Ing Jr.
Solved!
Go to Solution.

Hi Mathieu,
Unfortunately, there currently isn't a very good solution for the problem you are facing. It seems like this is a known issue that R&D is working on. It so happens that in addition to simply refreshing, this issue also occurs if you try to access the Remote Front Panel using a second tab in a tabbed browser. One "fix" would be to invest in a higher count Remote Front Panel license. If that's not feasible, then the current recommendation would be to avoid connecting to the Remote Front Panel from a second tab or refreshing the view in your browser. Once you exceed the number of connections to the Remote Front Panel, you will have to restart the RT controller -- there isn't a way to change this default behavior. You can track any fixes by R&D by keeping note of the CAR (corrective action request) ID for this issue, which is #202702.
Sanjay C.
Embedded Software Product Manager| National Instruments

Remote front panel SSH support?

Does the LabVIEW HTTP server which delivers remote front panel "content" have the option of running in SSH mode? If not, what are my alternatives for securing connections to remote front panel servers?

I am not aware of any options for SSH in LabVIEW. However, there are other ways to keep you remote panels secure. To prevent a user from gaining control of a VI, click the lower left corner of the front panel and select Lock Control from the shortcut menu. This option prevents a viewer from requesting control of the VI on the Web until you unlock it. Similarly, you can regain control of a VI from any Web client.
To configure more Web Server security options, select Tools»Options, select Web Server: Configuration from the top pull-down menu, and enter the Root Directory. After you enter a root directory, Web clients have access only to files in that directory and its subdirectories. All other files on your computer are not accessible on the Web. Select Web Server
: Browser Access to grant or deny viewing and/or controlling access to different IP addresses, so only known clients can view or run your application. Select Web Server: Visible VIs for control over which VIs in your Web Server directory are visible to a client, and to limit the time that a client can maintain control of a VI. Refer to the LabVIEW Help, which you can access by selecting Help»VI, Function, & How-To Help, for more information about configuring the Web Server.
Alternatively, you can program security into the VI itself. For example, you can require a user to log in when the VI first runs, and disable all other aspects of the VI until you verify the login. To do so, place a login field on one page of a tab control, the other controls on subsequent pages, and enable the other pages after the user successfully logs in.
J.R. Allen

6650d Flip front panel switch problem

Can anyone tell me how I disable the front panel switches on my Nokia 6650d flip. Whenever I put this in my pocket the switches are activated whenever I walk: resulting in an annoying beep. It also flattens the battery. It completely negates the point of a flip phone. The phone is OK I just need to know how to disable these annoying buttons. Can anyone help?

To lock the keypad in the standby mode, press the left selection key and * within
1.5 seconds. To set the device to automatically lock the keypad after a certain
time, select > Settings > Phone sett. > General > Security > Phone and SIM
card > Keypad autolock period > User defined and the desired time.
To unlock the keypad, select Unlock, and press * within 1.5 seconds.
When the device or keypad is locked, calls may be possible to the official emergency number
programmed into your device.
To lock the cover keypad, slide your finger on the the left cover touch key and then
the right cover touch key within 1.5 seconds. If you have locked the keypad from
the cover display, and your device goes to sleep mode, you first need to press the
camera key to activate the cover touch keys. To unlock the cover keypad, slide
your finger on Unlock (left cover touch key), and then OK (right cover touch key)
within 1.5 seconds.
If i have helped at all a click on the white star below would be nice thanks.
Now using the Lumia 1520

Open and close a vi front panel dynamically

I created a main vi panel that display all the signal names. I like the main vi to open a new plot screen when I double click on the signal name. I was able to do that using invoke node. But I when I close the plot screen by clicking on the Window "Close" button, the main vi was not able to open a new one again. So I disabled the Window "Close" button and only use the "Stop" button coded in while loop in the blockdigram of the plot screen. It worked, but the plot screen is still open and changed to editing mode. Is there an easy way to close the plot screen by only one click. Another question is that how does the main vi can open multiple plot screens. Thanks for your advice.

I think I know what happens:
If you close the front panel of a sub-vi, the code is still running, so the VI doesn't terminate and somehow you can't address it (it don't know how you communicate with your sub-vi).
So in your sub-vi you should monitor the panel-close event, and finish the code of the VI and finish the VI
Ton
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Open and Close Front Panel of SubVI

Hi all,
Running LabVIEW 2011 on Windows 7 x64. I am trying to get a subVI front panel to open from my main FP with the press of a button and then close with a button press in the subVI. Here is the piece from my main FP that calls the VI and opens the FP
Plots is defined in another loop and all of the loops are in a flat sequence. I did it this way because I want it to start with the first press and not stop my main loop from running. I have moved the item in the left loop around a lot so I'm not sure if I can run that in the same loop as the event or not. Either way opening the VI seems to work fine.
The problem shows up when trying to close the subVI for the SECOND time. The code is here:
As I said, the first time I open and close the VI everything works as I expect it should. I am then able to open it again but now the "blank button" doesn't function and I can't close the window or even open the block diagram to probe anything. I have been trying to figure this out for awhile, any insite would be greatly appreciated!
Thanks
Solved!
Go to Solution.

Its good that you found the bug.
This code may serve as a way for you to compare notes.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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.

Square root symbol in front panel

how to inser a square root symbol in the front panel in the given vi snippet? i want to write V3 instead of sqrt(3). using Labview 8.6.
Solved!
Go to Solution.
Attachments:
GUI.png ‏15 KB

Hi,
Thank you all.. I could insert the sqrt symbol in the GUI.
I also want to initialise one of the strings with the same symbol. So I copied the sqrt symbol and inserted that in place of "sqrt(3)" . but it switched back to a special character. I selected that special character and selected symbol font from the font menu, then it switched back to sqrt symbol. but as soon as i clicked the mouse outside, it reverted to the old special character(may be the one corresponding to 0xD3 in Application Font).
How to fix this?
Attachments:
sqrtinit.png ‏5 KB
sqrt_reverted.png ‏5 KB

Front Panel Mass Binding Project Variables Issue

Hello -
When attempting to bind controls to shared variables through the front panel mass binding option, there is an issue where you can not seem to bind a "project item" to the control. The method of binding I am using is to export a text list of control names, urls, mode, and function to a text editor utilizing the front panel binding mass configuration options. The text editor shows, in the fourth column, a "0" for no function, a "1" for network item, and a "2" for project item. when attempting to import the list back into the front panel binding mass configuration, all "2" indications become "1", as all items are treated as network. Thus one can not effectively bind to a project shared variable item.
The binding works fine manually by means of utilizing the properties selection of the control, but it is difficult to do this for 821 controls, as in my application.
My application is based on a OPC served group of 821 variables which are linked to controls and indicators through the shared variable representation for each item created in the multiple variable editor.
Does anyone have a work around for this issue, as it is a showstopper right now, ie, you can not effectively bind a large quantity of controls or indicators to project located shared variables as required.
The rationale behind utilizing project located variables instead of network located variables is to reduce the amount of calls to the OPC server which was causnig a large latency in the refresh of the 821 items. With the items defined as shared variables within the project, a single call is issued, which has tremendously sped up the refresh cycle for the list of variables.
Thank you in advance for your insight in this matter,
John DeCroos

Hello Brian A.,
In response to you comment --
"in 2006, and John did not follow up with any more information for Efosa"
-- a great deal of information was provided to NI (Efosa and many, many others, up to the product manager for the DCS module). I have never heard back on a fix for this bug for the identified version of LabVIEW. The reply by Efosa here was well after we had shipped our product -- (please see date + Efosa's apology) -- we had found our own solution as is identified in the original post.
My solution was, as is also indicated in my original post, to manually bind each variable. This was unbelievably time consuming, but was all I had.
The version of software I am now working on uses far less variables, manually bound to avoid the multiple binding issue we had in the past.
I have checked the mass binding function in LV 8.5.1, it works fine now. I guess it would have been nice to have had a reply that the bug had been resolved ---- would have helped me out a bit.
Thank you,
John DeCroos

Reading main VI front panel in SubVI

Hi,
I'm trying to create a subVI that writes a header text file containing info on essential parameters in my measurements. My mainVI front panel has a few dozen controls, some of them contained in a handful of clusters.
What I'd want is just to be able to access and read the values at the subVI to construct the string I want to write to the file.
I wouldn't like to proceed the dumb way, i.e., building an array of clusters or individual controls or references to them and passing that to my subVI (and, obviously not passing each individual control/cluster as a subVI input).
I figured I'd like to have some kind of refnum of the mainVI frontpanel passed to my subVI and dig use a big pile of property nodes to dig out the info that i need, inside the SubVI. Is this a feasible solution and if so, what's the way to conduct it? If not, what would be a better way?
As before, I'm using LV7 so in case you answer with block diagram examples, I'd appreciate screenshots of them.
Thanks,
Lauri

Vostokki wrote:
I'm trying to create a subVI that writes a header text file containing info on essential parameters in my measurements. My mainVI front panel has a few dozen controls, some of them contained in a handful of clusters.
What I'd want is just to be able to access and read the values at the subVI to construct the string I want to write to the file.
I wouldn't like to proceed the dumb way, i.e., building an array of clusters or individual controls or references to them and passing that to my subVI (and, obviously not passing each individual control/cluster as a subVI input).
Lauri
Actually that is the preferred way to do. Why you may ask? It is because you decouple the functionality (creating your log file header) from your specific user interface. By doing so you can reuse this VI in other places or applications. By using the references directly this ties the subVI to the calling VI. Unless the subVI is specifically doing something to the UI itself a subVI should avoid accessing data it needs via direct references. It should require the data to be wired in with the appropriate clusters, arrays or whatever your data needs are.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

How to open remote front panel of vi's within an executable from an executable.

How do I remotely open front panels of subvi's contained within an executable, where both computers just have LabVIEW Real Time loaded (programs are run as executables)? I want to use the Method: Remote Panel Open Connection to Server to make this work. I have been getting error 1032 "VI Server Access Denied". I do not want to use the web page method (connection is too slow when controlling front panel objects and I can not programmatically exit out (release control of vi) of the web page).
Ex.
PC1: Has executable1 using Remote Panel Open Connection to Server Method etc. code inside. This program will make a call to executable2 (on PC2) to open up different vi front panels (within executable2), so the controls can be changed from PC1. I want to be able to make changes to the vi's running on PC2 from PC1.
PC2: Has executable2 containing several subvi's.

Not sure if this is what you are looking for but here is how to launch executables that can interact
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

Conditionally include Front Panel of a Subvi in an EXE

I want to make two versions of an EXE, one "normal" version and a debug version. I know how to set conditional disable symbols via pre/post build actions (btw. NI: these variables should REALLY be defineable per build specification; even bare command line C compilers are easier to use in that regard than Labview).
The "normal" version won't show anything but the main vi. The front panels shouldn't even be included in the exe. For the debug version I want to show the front panels on request (I've queues for sending that to the subvis). Simply calling "FP.open" does not work with an compiled exe, because I get a "resource not found" error (the front panel of the subvi is not compiled into the exe). I tried setting show "frontpanel when called" which forces the FP to be compiled into the exe, but then the FP will shortly flash on the screen, even when the first command of the subvi is hiding the frontpanel.
How can I make a subvi depending on a conditional disable symbol include its front panel into the exe without forcing it to show its frontpanel at the same time?

There are a number of things which cause LV to keep a FP when building. These include things like open when called (which you understandably don't like), but also various things which statically require the front panel. Things like changing the scrollbar settings or creating a property node for a control on the FP. Personally, my preference is for the latter because you can document it better.
If you don't actually mind whether the FP is included, you can just do that and be done with it. If you really do mind, you can check whether placing the property node for the control in a conditional disable structure has an impact on this or not. I have no idea whether it does or not, since I don't know exactly how LV will treat the code in the disabled case.
The other alternative is making two builds and configuring it for each VI:
The disadvantage here is that you have to manage two builds and do this manually for each VI.
If you want, there's a related idea on the idea exchange, but it won't actually help in your case, because it's not conditional:
http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Add-a-property-to-guarantee-that-the-front-panel-of-a-...
Try to take over the world!

How to open front panel of a VI running in RT.

Hi,
I have an application to read the encoder position using the cRIO program. I have made an executable and this application runs as startup application whenever the controller reboots. Right now, i am accessing the VI of the startup exe through Remote Panel connection. This works fine but everytime i close the remote panel , i have to reboot the controller for the next view.
So is there any alterntaive to open the front panel of the VI.
I tried using VIServer but ran into errors. (i tried using front panel -open property node.did not work)
Also i do not have any VIs stored on the controller. Only the exe is stored on the ni-rt/startup folder on the RT controller.
Please let me know how to open this VI.
Thanks.

Hi Ben,
When i close the remote front panel the first time, i am terminating the RT VI which is running on startup.
So i had to reboot everytime to access the remote VI. I guess that the VI (exe) should be continuosly running when the RT is started up. The remote panel only should be opened and closed. After I close the remote panel , i want a windows VI to be opened up.
I have a Windows VI which programmatically opens connection to the RT server for opening the remote panel. The VI runs. When the user clicks Exit on this RT VI, the VI running is stopped and then another windows VI opens up. This works fine for first time. Since the RT VI is terminated, second time , if I run, it says, VI not in server memory.
Is there a method to close the remote panel programmatically in the RT VI itself. I have a Exit button in this RT VI, so if the user clicks, Exit, the program has to be running, but the remote panel has to close. There is a method called close connection to client , but this does not work in RT , as this requires VI path.. Right now , when the remote panel RT VI is launced, to close the remote panel, i click on the 'close' button on the VI title bar. Again when the remote panel is launched, there is no error. but is there a method to close the remote panel in the server(RT VI itself). i have attached the VI.
Thank you.
Attachments:
Dummytest.vi ‏39 KB

Unlocking front panel

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