Multiple remote front panels?

I have two separate applications running with remote front panels from this KB:
How can I use Remote Front Panels with Executables?
I can not get the two to run at the same time. I was then shown this:
How can I run Two or more Executable with remote front panels?
This seems to be a little old (Version 8). I am running 2012.
Has anyone gotten this to work? How do you set up the web server to listen on more than 1 port? How do you then direct that port to a particular app?

Thank you for the solution Todd. I was having the exact same problem.
LabVIEW 2013 SP1
Windows 7 64bit
Windows Server 2012 64 bit
Windows 8.1 32 bit

Similar Messages

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.
Thank you very much!
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.
Another thing to keep in mind is that what you want to accomplish can be done in many different ways that would be much easier than creating multiple remote front panels.
One of these is to move all of your controls and indicators to the top level VI. i.e. make the data you want to see from the sub-VI an output of the sub-VI and create a new indicator for this on your top-level front panel. This way you can still use a remote front panel and can use different decorations and labels to separate the top-level and sub-VI outputs.
Another way to do this is to use the tab control to create multiple tabs, one for your top-level indicators, and one for your sub-VI indicators. This would still enable you to use remote front panels and would allow for the separation of your different indicators. Here is a note on how to do that:
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
National Instruments

Remote front panel: loading VI into controller memory

Hi everyone,
I am currently using LabVIEW 7.1 and need some expert help.
I have a VI (which also include more than 80 sub VIs) that controls a system through compact Field Point module controllers. Currently, all these VIs are stored in a server computer.
At this stage, I am capable of creating a remote front panel, which allows me to control the system from a client computer other than the server computer. Instead of using the server computer to control the system, I would really rather to use my field point controller to do the job, and I have the following questions:
1. In the server computer, VI can be loaded to memory by opening the VI, how do you do it if you were to use the cFP-2015 controller as a server?
2. I created a "startup.exe" and the "htm" files for my program and stored them in my controller and set it to launch application at boot-up. For once, I can access to my controller from the web. But once I close my browser, and re-access the web, the memory in my controller seems to be lost and I got an error message saying VI was not loaded in server memory. Is it possible to store the VI in the memory of my controller for a long time??
Many many thanks in advance.
Tak

Hello Guenter,
Thanks for your explanation. I think your description match very well with my observation. Your suggestion of flashing the LED while my program is running is a good idea.
Sorry that I didn't describe what happend well enough, here is what happened to me.
I embedded the program which simply turn on and off one of the LED on my cFP controller for 20 times.
I re-boot my controller and wait some time, I then see the LED turns on and off.
Before my program finish, I can access to my remote front panel page for multiple times even after I closed my browser while the program is still running.
If I request control over the controller, I can manually stop the program, and then re-start it.
However, after I re-start the program remotely, if I closed the browser even while the program is still running. The program stops as soon as the browser is closed. When I re-open my browser, it says the requested VI is not loaded in the memory on the server computer.
So, correct me if I am wrong, it sounds like embedding my program as exe file, download to my controller, and set it to launch the application at boot-up is the only way to load the VI into controller's memory. Is there any other way?
So, having said that, I have to re-boot my controller every time when I want to start my application file that is sitting in my controller, is that correct?
Many thanks again.
Tak

Where does the processing take place when using a remote front panel?

Hi,
I am considering upgrading my LabView software from 6i to 6.1 for the new "two click" remote front panel feature. I have already seen a demo of this feature but have just a few questions before I get the upgrade:
My setup consists of several pieces of equipment connected to Labview via GPIB, to aid in the evaluation of a new microchip.
1. I wish to grant control of the setup to anyone with a web browser, Is the remote monitoring feature compatible with both Netscape and IE?
2. The VI which controls the setup is currently located on the PC beside my setup. When I embed a VI in a remote front panel, where does the processing take place, is the local VI still controlling the setup? and
the remote panel just sending and receiving data from the local VI.
Thanks, Troy

> I am considering upgrading my LabView software from 6i to 6.1 for the
> new "two click" remote front panel feature. I have already seen a demo
> of this feature but have just a few questions before I get the
> upgrade:
>
> My setup consists of several pieces of equipment connected to Labview
> via GPIB, to aid in the evaluation of a new microchip.
>
> 1. I wish to grant control of the setup to anyone with a web browser,
> Is the remote monitoring feature compatible with both Netscape and IE?
>
Yes. Provided they are resonably modern versions.
> 2. The VI which controls the setup is currently located on the PC
> beside my setup. When I embed a VI in a remote front panel, where does
> the processing take place, is the local VI still controlling the
>
setup? and the remote panel just sending and receiving data from the
> local VI.
>
The computer which we refer to as the server, the one with the GPIB card
in your case, will execute as it does now. In fact, its window will
even be open. The remote client computer, the one with the web browser
will be running the runtime engine and processing user events, value
change and property/method events from the server. So in reality, both
computers will be sharing the load a bit. This allows for very small
packets to be sent between the computers. It is in fact quite similar
to publishing the data between the computers using datasocket.
One thing to keep in mind. Standard LV includes a license for one
connection. If you want to allow for multiple web browsers to view at
the same time, additional licenses are available. Also, only one user,
remote or server may be in control of the panel at a time. That means
that if you want to be able to operate the panel, changing kn
obs or
flipping switches, the others will become viewers only until you give up
control. Hopefully this isn't a surprise, but I thought you might want
to hear about it now.
Greg McKaskle

RT Remote Front Panel issues.

I'll start with my setup:
2 PXI-1042 chassis connected via fiber-optic using NI PXI-8336 (MXI-4) cards.
Chassis 1: PXI-8108 embedded controller running LabVIEW Real-time OS (2010), PXI-6528 DIO, PXI-8336 MXI-4.
Chassis 2: MXI-4 in slot 1, 4 PXI-8334 DMM, PXI-6528 DIO, PXI-6281 M-series DAQ.
The real-time executable monitors analog and digital inputs and DMM measurements, displays the values using numeric and boolean indicators, generates alarms and allows users to acknowledge alarms via a Remote Front Panel. The code has a custom error handler that traps errors and stores them in a global array. This allows the code to display them on a console and allows the user to acknowledge and clear errors, and scroll through multiple error messages. We used property nodes sparingly.
The system is monitored by two laptops with the correct run-time engine installed (both laptops have the LabVIEW development suite). Under normal conditions, one laptop keeps control of the Remote Front Panel at all times.
The problem:
The system was running flawlessly for 3 months of continuous use. Then, for no apparent reason, the indicators that display measurements from "Chassis 2" (specifically the DAQ) stopped updating.
If the user refreshed the browser, the Remote Front Panel client would reconnect to the RT Web Server and get updated values, but they were always static. Essentially, refreshing the browser took a "snapshot" of the data, but the indicators did not update continuously as before. At the same time, DIO inputs to "Chassis 1" responded appropriately to changes in state.
Refreshing the browser on one laptop would update the values for that laptop only, and the other laptop could be refreshed independently and have different values displayed, but both laptop's indicators were static. During this time, the DMM measured inputs were not changing and the "Chassis 2" DIO inputs did not change state (i.e., we could not perturb the inputs), so we could not determine if those indications were affected.
Also, the error console did not respond to user input until the browser was refreshed and the client reconnected to the target.
We know the RT application is running on the target because there is code that monitors the status of the loops by changing state every loop iteration and displays the status to the user.
Our short-term solution was to reboot the RT controller by powering down both chassis, starting "Chassis 2", then starting "Chassis 1". It's been running for a few days now without incident.
Since the data displayed after refresh was accurate based on comparison to gages in the system, we do not suspect a measurement problem.
Possible culprits:
1. The RT Web Server has malfunctioned in some way (memory problems, synchronization, etc.)
2. The MXI-4 link.
3. Cosmic rays? Sunspots? Nearby radar stations? Neighboring HAM radio operators (with massive amplifiers)?
If anyone has any ideas, they are welcome. We are concerned that this will be an ongoing problem, if only every few months or so.

Could you clarify a bit on how the PXI-6528 was acting while you were seeing these problems? Does this card have values display on the Remote Front Panel, and if so were they still updating properly? I believe you were saying that, but I wanted to be sure because that makes a big difference.
If everything became static, including the DIO card, at the same time, then I'd say see if your browser updated, or something in your network settings was changed without you noticing. Perhaps an update ran and reset some of your firewall settings, or an Internet Explorer update changed something that required a reboot.
If just the outputs of chassis 2 were the problem, and the DIO card values on your remote front panel still worked well, then it is most likely a problem with your MXI-4 cards or your fiber optic cable that cause the change in behavior.
Miles G.
National Instruments
Applications Engineer

How can I close a remote front panel by closing only the browser window?

I control a remote front panel in a browser (from the client PC). If I don't use the 'close' - button in my program to end the remote front panel, but instead of this the 'x' of the browser window (in the right bottom corner), my program won't be close, it continues on the server. Do you know how to end a VI by closing only the browser windows?
Thanks for any help!
wolfe

I found the examples. Thanks.
But I could not find a solution yet. Now I know how to end a VI by clicking on the x of the VIwindow.
My problem is, to end a VI by clicking on the x of the BROWSER window after I loaded and controlled a remote panel VI in a browser (e.g. IE).
If you have any ideas ... I'd be happy.
Thanks for your help.

Remote front panels

when I use remote front panels in LAbVIew 6.1, The Web Server and the client interact using DataSocket Technology through the ActiveX controls embebed in the web page?

> when I use remote front panels in LAbVIew 6.1, The Web Server and the
> client interact using DataSocket Technology through the ActiveX
> controls embebed in the web page?
No, it is a low-level TCP based protocol that passes the data values and
property values similar to datasocket, but not using datasocket.
Greg McKaskle

Server does not support remote front panels

hello
I'm about to command the front of my labview program remotely. I followed all the steps that I found on the NI website. when I do the test on my Intenet Explorer browser it gives me the following mesage: "Server does not support remote front panels".
I await your propostion and solutions. Sincerely

Hi,
This KB might help.
Christian

LabVIEW Remote Front Panels and WebCT or Blackboard Integration

Hi,
Has any one had any experience with getting LabVIEW Remote Front Panels working with WebCT or Blackboard E-learing software?
Generating the Remote Front Panel is easy enough, it's incorporating the Remote Front Panel into WebCT or Blackboard that am interested in?

Hi,
Are you using FieldPoint 6.0.2? We have a Corrective Action Report (#125870) for the remote front panels for the cFP-2220 with LabVIEW 8.6 and FieldPoint 6.0.2. R&D is currently working on a fix, until then, the only known workaround is to using LabVIEW 8.5.1.
Regards,
Jeremy_B
Applications Engineer
National Instruments

Configuring Remote Front Panels on a Real-Time Target,smart camera,but there is no image in the web page.

I do see the web page, but the image itself is not loading.i know a problem is with the installation of the LabVIEW ActiveX plug-in or the IMAQ ActiveX plug-in. The LabVIEW ActiveX plug-in is required for ALL remote front panel viewing, and the IMAQ ActiveX plug-in is needed for VIs that use the Image Display. how can i do ?where can i get the the IMAQ ActiveX plug-in. help me！

Got it working, after much experimentation. Seems to require installing exactly the right combination of items on the RT target, as some items (web services? web configuration? the "application web server"?) apparently run a separate web server - or instance of the web server - on port 80, which prevents remote front panels from being served on that port.

How can i access remote front panel in RT with LabVIEW run time engine in client PC

Hi to all,
I have developed the RT application with cRIO 9075 integrated chassis. And i have access its remote front panel in client PC. Now i want to access the remote panel in the client PC without having LabVIEW runtime engine. If i connect the remote panel with that client, it shows only the vi border. i doesn't downloads the front panel.
How Can i access its remote front panel without LabVIEW runtime engine in the client PC?

You cannot view a remote front panel without the LabVIEW runtime - the LabVIEW runtime is what makes the remote front panel possible. What you will want to do instead is likely create a Web Service that you can access from a remote PC without requiring the LabVIEW runtime. However, this will require you to develop a web-based HTML or similar UI to interact with the VIs running on your system - NI hasn't yet created a way to export a LabVIEW front panel as an HTML'ish page.
-Danny

Remote Front Panel Problem

Hi
I am using a TAB control in a VI that is published as Remote Frontpanel.
When changing TAB the controls are often grayed out in the browser even when they are not in the running LabVIEW VI !
A Combo box may also contain the apps default values instead of the values from the running VI !
Any hints to solve this ?
I have login/logout in my application, and i need to auto logout when the last Remote Front Panel User disconnects.
How do I detect that there is no listeners/clients ?
The "connection manager.vi" is password protected, so i can't get any hints from there !
Best Regards
Teddy

I see thank you. Very funny because i thought i had to do something with duplicating the real time target.
So regarding the above problem, is there any way to be connected remotely to the target and when the link is broken to reconnect without affecting the operation of the VI running?
For example, lets assume we connect to a remote front panel which has a simple VI with just a 1 second period timed loop running and for each iteration of the loop i monitor and i save the index of the loop. When i connect to the VI i request control and i click run. The VI starts running. After one minute, at loop iteration 60 the link between the host and the target breaks. The VI should continue running.
After 1 minute of broken link the network is again available.
What can i do to re-establish connection without affecting the VI operation and continue monitoring the VI. If reconnecting after 1 minute i will be expecting to see the loop iteration to be 120 and keep running. Is there any way to do this?

Hi,why I have a "DMA hardware error detected" when I try to save file as *.htm for remote front panel application?

Hi,
I try to learn how to present my data anywhere by using labview remote front panels. I use PCI-mio-16E-4 device to acquire data. After I start web server and try to save to as *.htm file, I got the "DMA hardware error detected" message. Can anyone help me to solve the problem. Thanks.

What was the actual error code?
Copyright © 2004-2015 Christopher G. Relf. Some Rights Reserved. This posting is licensed under a Creative Commons Attribution 2.5 License.

Error accessing Remote Front Panel on RT Target after upgrade to LV2011

I'm upgrading a real-time application (target is a desktop PC running the LabVIEW real-time) from LabVIEW 2009 to 2011. Under 2009, it was possible the view the main VI remotely by browsing to a static HTML page that embedded the front panel. After upgrading to LabVIEW 2011, instead of the front panel image I get an error saying "Server does not support Remote Panels." I have already gone through the list of possible causes from "Server Does Not Support Remote Panels" Error When Connecting to Remote Front Panel, and none of these resolved the problem. I am using the standard LabVIEW web server, there is a direct ethernet cable connecting my computer with the real-time system, and I have recreated the web page to reference the correct plug-in version. I reformatted the RT system and then did a clean install of the components from LabVIEW 2011 (using the Add/Remove Software feature in Measurement and Automation Explorer). I also created a new test project with a new simple VI; I was able to access that VI remotely on port 8000, but not on the default port 80 (which used to work under LabVIEW 2009). What changed in the web server between LabVIEW 2009 and 2011? Can I use the standard HTTP port 80 to serve a static page with an embedded VI, or does this now only work on other ports (and if so, why)? Will I need to recreate my entire project in LabVIEW 2011 in order to get this working at all?

Got it working, after much experimentation. Seems to require installing exactly the right combination of items on the RT target, as some items (web services? web configuration? the "application web server"?) apparently run a separate web server - or instance of the web server - on port 80, which prevents remote front panels from being served on that port.

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

Multiple remote front panels?

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