Multiple Remote Panel Instances

Hello all,
I am interested in adapting some simulation VIs for a distance learning application. The VIs demonstrate some of the basics of control theory, and I would like the students to be able to access via the web. Playing around with the web builder wizards I managed to get it working. However, the single user control behaviour is not suitable for classroom teaching etc.
This example http://zone.ni.com/devzone/cda/tut/p/id/4041 and relevant templates http://zone.ni.com/devzone/cda/epd/p/id/2440 seems like it might offer a solution. However, seeing as this was written for an older version of labview and my knowledge of html/cgi scripting is essentially zero, I was wondering if anyone had experience with using something this? Or have found a different solution to the multiple instances problem? I think this may not be a trivial amount of work, so I was hoping someone could offer advice as to whether this avenue is worth investigating.
Thanks very much in advance!
Regards,
James

From your description I'm assuming that you have your simulation running in desktop LabVIEW on some machine and your trying to make a web UI that connects to that simulation through a web service. If you want the kind of instancing that remote panels provide you either have to make your web service more complex or you have to move your simulation into Web UI Builder diagrams so the web service is not needed.
Each window that views your web UI will be running an independent copy of your web UI VIs. So if everything is implemented as web UI VIs, then there is no sharing and you can open as many instances as you want. If you can implement the simulation entirely in these VIs, then your problem is solved.
If you need the simulation to run in desktop LabVIEW, then the solution is different. LabVIEW web services do not maintain a connection with their clients, so they don't have any way to recognize a request as being from the same machine as some previous request. If you need that, you will need to add that capability to your web service. You could have a web service call to start a session. That could start a simulation and return some identifier to the web UI. Each time the web UI called another part of the web service, it would provide this identifier so the web service would know which instance of the simulation to operate on. The client could call another web service entry point to stop the simulation, but you won't be able to count on that. The user could navigate away from the UI page or close the browser without the program having a chance to tell the server to stop. To avoid running out of memory, the server would probably need to have some cleanup task to shut down simulations that had not been accessed for some period of time.

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Is it possible to limit the number of remote panel connections to a vi?

Hello,
I have an application running on a RT PXI and I'm using remote panel to access it. My licence allows me to have multiple remote connections and it's ok as I sometimes need to open multiple remote panels at the same time. However, I would like to limit the number of connections to 1 for a particular VI. Is it something that can be done?
Regards,
Patrick Lessnick
Solved!
Go to Solution.

Patrick: If you right click on your target PXI system in the project exporer, select Properties>Web Server>Browser Access you can select who you let have access to your VIs. Likewise, in the Visible VIs section of Web Services you can limit which of your VIs you want people to be able to see.
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Can 2 remote panels control the same VI without right-clicking to get control?

Is it possible for multiple remote panels to be able to actively interface with a single running VI without having to manually request and release control by right clicking? I am using Labview 8.2 Professional Version.
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Regards, Guenter

Can multiple PCs access one remote panel at the same time?

I've written a program in labview 7.1 to monitor/control a labview application running in the test cell through Remote Panel. I and my coworker can remotely monitor and/or control this labview application individually. But if my coworker has the remote panel displayed on his PC and I try to get the remote panel on my PC, I get a labview error (63) as below:
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Y

Sorry I wasn't clear. The remote panel license is separate from the number of LabVIEW development licenses. Pricing information on remote panel licenses can be found here.

Crio to host multiple remote front panels

Hello all,
I've a question abt remote front panel hosted by a cRIO system (cRIO9068 to be more specific, running RTOS).
I have a top level VI (main) as the start up vi in my cRIO system, and it would call a subvi during run. I'd like to enable remote front panel for both the main vi and the sub vi so that I can see both front panels using a web browser. I'm not sure if such a configuration is possible at all and would like to listen to comments by users who have similar experiences.
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Best,
Jidong

Hello hhaamm,
To the best of my knowledge, I don't believe it is possible to host multiple remote front panels from the same executable, and, if it is, would be very difficult. The NI Web Server configuration file only specifies one port on which an executable can run web services, like remote front panels. In, short, I am not sure how you would be able to accomplish this.
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http://zone.ni.com/reference/en-XX/help/371361H-01/lvhowto/creating_tab_controls/
And here is a more in-depth forum post on how to create them:
https://forums.ni.com/t5/LabVIEW/how-do-you-create-tabs-on-the-front-panel/td-p/201495
The final way I can think how you would accomplish this is to use a web service instead of remote front panels and host the output of the sub-VI as a separate website.
Hope this helps!
Collin D.
Applications Engineer
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Remote Panel of VI template

My application launches a VI template instance dynamically, and I wish to have Remote Panel access to each of these templates. How shall I create Remote Panel HTML page for each instance on the fly? Or is there any way by which I can access by template instance in Remote? My application is in LV 8.2.1 and I need this in EXE application.
Thanks,
Priyadarsini
Solved!
Go to Solution.

After launching the application, please type "http://computername:86/Instance1.html" in the web browser
Please ignore the previous attachments. There is a small issue in it. I apologize for the inconvenience.
Thanks,
Priyadarsini
Attachments:
Remote Panel for Template - LV 8.2.zip ‏31 KB
Remote Panel for Template - LV 8.6.zip ‏127 KB

VI Templates and Remote Panels

My system creates multiple test windows using a dynamic load of a VI template, and I wish to have Remote Panel access to each of these test windows. The user does not need to instantiate the windows remotely, only access them. So, when each window is created, it creates it's own HTML file so a user can access it. It worked just great for .snap publishing -- so far, so good.
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Now when I try to access the Remote Panel on my instantiated test window, I get an error like this "The VI named 'Test Window 1.vi' contains unsaved untitled subVIs. Cannot save the VI before all its untitled subVIs are committed to the disk'. This error indicates that my template-subVI instantiations need to be saved in order for the Remote Panel to work. I'm not sure why this is a requirement, but let's go along with it for now.
So I went ahead and used a VI server method to save the untitled subVI instantiations to a temporary directory, with the intention of deleting them when the test window is closed. It worked! Kind of... it worked in development mode, but didn't work when I built the executable. The executable gives me error 1043: "Not supported in this version" when it tries to save the untitled subVIs (even though I specify to save WITHOUT the block diagram, which obviously isn't there).
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TruView Technology Integration Ltd.

Hello again everybody,
Sorry I have to re-submit my post. I found a bug in my demo (where the VI name referenced in the HTML did not match the running window). Also, I made it to dynamically set up the web server path, to make it easier on you.
BTW, this is in LV 7.0. And a warning: this problem is not for the faint-of-heart. I somewhat doubt there is a solution without NI changing how Remote Panels works.
Again, my apologies for the previous bug.
-Dave
Attachments:
main_v2.zip ‏79 KB

Selecting and running vi's on a compact FieldPoint 2120 via remote panel

Hi,
I'm trying to provide two html files to run two different vi's on a compact fieldpoint. I can run either of them by setting them as 'run as startup' in the Build Specification which creates the startup.rtexe program on the controller but the only way I can run two different vi's on the fieldpoint is by renaming the files in the startup directory before calling the html file (and that doesn't work that well). Is there a better process to allow different programs to be run on the compact fieldpoint via the remote panel/html calls?
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Hey AgB2,
I think the best way to get multiple HTMLs linked to their respective VIs would be to set your VIs as the Startup VIs when you build the EXE to deploy to your Compact Fieldpoint. A KnowledgeBase article describing the steps to do this can be found here:
http://digital.ni.com/public.nsf/allkb/466EA9705F98E07786257687005E081B?OpenDocument
Next, all you'll need to do to get your two HTML files to run two different VIs will be these steps:
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3. FTP your HTML files to the www folder on your cFP
Once you restart the cFP, your EXE will run at startup with both VIs and you can access them by navigating to http://<ip address>/<vi name>.html. Just to double check, I did this on my computer and had no problem loading both HTMLs or taking control of both VIs at the same time.
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Remote panel / Web server. II part ?

Hi all
There has been some activity about remote panels / web server in this forum.
Basically, NI documentation states LV run time, at least, must be intalled in client PC to use that feature.
In this link to post
a post from NI engenier Jeremy L. says that just to monitor a remote panel vi, NI soft is not necessary in the client PC. That option looks very interesting.
So, my questions are:
1- Somebody got to monitor a remote vi if LabView or run time is not installed in client PC.?
2- Can NI peo
ple clarify this option?
3- What is, if anything, the minimun NI soft required in client PC to monitor a remote vi front panel?
Thanks in advance
Alipio
"Qod natura non dat, Salmantica non praestat"

alipio wrote:
> Thanks. I got last Jeremy´s post after posting my question.
> Now I can monitor remote vi without NI soft.
> About 3rd question, what I mean is if it is neccesary the full run
> time or one only needs some dll or other small plugin from NI to get
> control of remote vi.
Well as I said for monitoring, NO NI software is necessary. For Remote
Control you basically need the lvrt.dll runtime and some supporting
files such as lvapp.rsc.
As the runtime gets more and more complex it is not a good idea to try
to install individual files. Eventhough the lvrt.dll contains up to now
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necessary to be able to for instance display the LabVIEW 6.x 3D controls
(all of the
models directory is then necessary) or in the case of the
web plugin I would assume the lvpng.dll and lvjpeg.dll will be also
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Also some registry settings have to be set so that the plugin or LabVIEW
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In view of this I would not even consider getting a LabVIEW runtime
system onto a computer other than by adding it through the application
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Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Remote panel portals?

Hi all,
We are looking to provide a solution for the control and display of multiple instruments by 2 workstations on a network.
We need the ability for a user at one workstation to assume control of some of the instruments, whilst the other user controls a different set of instruments. Both users will need to see the display from all instruments.
Remote Panels seem to allow control of the server vi to be switched between server and client, but the control switch functionality appears to be for the whole application.
Is there any way of creating a 'portal' that holds control panels for each instrument allowing the user to elect which device to control?
Best regards
Phill

Hi Phill,
The following document describes what you're trying to achieve. I believe the example uses the Internet Toolkit though:
http://zone.ni.com/devzone/cda/tut/p/id/4041
Would it be feasible to have the two different sets of controls on two different VI front panels? It may be more straight forward to implement it in this manner.
There are also some licensing considerations to bear in mind, see the following links:
http://digital.ni.com/public.nsf/allkb/18C057D7C5A8EA0486256CAE0069557C?OpenDocument
http://digital.ni.com/public.nsf/allkb/2E814A22B7660EA786256BD500652F2C?OpenDocument
Sarah
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Remote Panel suddenly stops downloading at about 90%

Hello,
I have a Vi running in a cRIO and I want to control it with a web browser (Internet Explorer 7). The cRIO is connected to internet with a GPRS modem (MultiModem GPRS from Multitech).
Because the GPRS connection is low bandwith, I can open remote front panels of small VIs, but the main Vi, always, stops downloading exactly at 90 seconds and that means a download of about 90%, as can be seen in the image I´ve attached. To open the remote front panels of small VIs tooks less than 90 seconds.
The timeout for WebServer Configuration, in the cRIO, is in 360 seconds. I have, also, modified, witout success, the KeepAliveTimeout = 600000 and ServerInfoTimeou = 600000, for Internet Explorer (http://support.microsoft.com/kb/813827/en-us).
So, any idea about what could be hapening?
Thanks.
Solved!
Go to Solution.
Attachments:
RemotePanelStop.JPG ‏5 KB

Hi James,
Good morning and thanks for answer.
I forgot to mention that I have made another test, that consist in connect the cRIO in our LAN, and I can open the remote panel without any problem. Obviously it took less than 90 seconds to download.
I have attached the images of the main vi. I proved to remove the grafic and all the decorations but the size remains very similar (about 229000 bytes).
I didn´t mention, also, that sometimes download only 50%, it depends in the upload rate, the cRIO have, when opening the remote panel. I also tried to open, without success, directly from Labview.
Yesterday I made another probe, I´ve developed a vi (lets call intermediate vi) that is hearing the TCP port 80, and when a connection is established, it opens a connection with the TCP port 6342 in the same PC. After that, all the string received in the port 80 are redirected to the port 6342 and all the string received in the port 6342 are redirected to the port 80. It can establish multiple connections of these type. In that PC I have a Vi (lets call test vi) and the Labview webserver enabled in the port 6342. The purpose of the intermediate vi is to add the delay you want. I´ve inserted delays biggest than 90 seconds and instead I can open the test vi remote panel with the browser. Another interesting thing is that remote panel opens two connections to the port 80.
I hope you can understand me.
Thanks.
Attachments:
Tab1.JPG ‏119 KB
Tab2.JPG ‏91 KB
Tab3.JPG ‏86 KB

Multiple Remote Panel Instances

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