Remote front panel connection

I want to view a labview front panel from a remote PC. But I only have one computer at the moment. So I am trying to simulate this at local computer by setting the server address as localhost. But the connection is refused and it says: connection to a local labview application is not allowed.
Is that a part of labview feature or caused by improper setting in labview?
What should I do at this point?
Thanks for your reply.

It is a LabVIEW feature. Remote front panels are meant to be used on two separate machines. If you want to set something similar from one computer only, you can try the web publishing tool that embeds the VI in a htm page that can be viewed by using any web browser either on the same/ remote machine.
Regards,
Ankita

Similar Messages

How to display remote front panels of subvis that are already open

I inherited an RT project that uses remote front panels for nearly all the user interfaces. The host application opens a remote front panel the the top level RT vi, and there are several subvis on the RT system that are opened from that top level vi and thus displayed on the host (i.e. their "Show Front Panel When Called" properties are set TRUE).
If the Host loses its connection to the RT system when any subvi front panels are opened, and the host application is restarted, it can re-open the top level vi remote front panel, but all the RT subvis that are already open will not display their front panels. I am looking for a way to open the front panels to these subvis from the host application.
The kicker is, I need to know which subvis are actually running before I attempt to open remote front panels. Is there any way to determine what subvis are actively running (and not just in memory, such as subvis that won't get executed until the top level vi reaches a certain state)? I am thinking that I could create a list of the subvis that I need access to, check to see if any are actively running on the RT system, and then invoke a remote front panel connection with those that are running.
Does anyone have any ideas as to how I might be able to do so? Or any other suggestions? [and yes, I know that RFP communication is probably not the best way to go, but we're too entrenched in this software to start over with a new system!]

TurboPhil wrote:
If the Host loses its connection to the RT system when any subvi front panels are opened, and the host application is restarted, it can re-open the top level vi remote front panel, but all the RT subvis that are already open will not display their front panels. I am looking for a way to open the front panels to these subvis from the host application.
It might be possible to work around this behavior by placing VI invoke nodes in your top level VI that reference each of your subvis and setting the Wait Until Done invoke method to false. This should cause the subvi to close when the top level VI closes even in the case of an unexpected restart.
You can access this invode node in the functions pallet by selecting Application Control » Invoke Node and also selecting Application Control » Static VI reference. Wire the Static VI Reference to the vi reference input node and double click the Static VI Reference and select the appropriate subvi in the dialog window. Left click on the Method section of the invoke node and select Run VI. Finally right click on the Wait Until Done invoke method and select Create Constant and ensure this constant is set to false.
TurboPhil wrote:
The kicker is, I need to know which subvis are actually running before I attempt to open remote front panels. Is there any way to determine what subvis are actively running (and not just in memory, such as subvis that won't get executed until the top level vi reaches a certain state)? I am thinking that I could create a list of the subvis that I need access to, check to see if any are actively running on the RT system, and then invoke a remote front panel connection with those that are running.
You can access this information by using the Real-Time System Manager (Tools » Real-Time Module » System Manager). This can be used to show what VIs and subvis are loaded into memory and which are running.
For more information on using this tool please referere to this Knowledge Base article.
Message Edited by BLAQmx on 02-18-2008 11:40 AM
Mark
LabVIEW R&D

Remote front panel in tablet

Hi all
I am trying to establish a remote front panel connection on to a windows 8 32 bit OS on 64 bit atom processor tablet from an exe deployed on myRIO. I had verified the remote front panel connectivity on the development PC (windows 8 64 bit OS on i7 processor), installed LV RT engine 2013 and the 32 bit drivers on the tablet. The problem is that the remote front panel connection gets stuck after some time. I am connecting the target to a B type USB which is connected to an OTG cable and then to tablet microUSB port.
1. I reduced the data rate to some 200 samples per second (displaying 20 values on a graph per 0.1 second), still the problem persists
2. The remote panel works pretty well when connected to development PC and to another PC (windows 8, 64 bit OS with LV RT 2013 installed) via USB, it is just the tablet that is losing the connection after a while (it says remote panel connection refused by specified server)
3. I connected target to a local network, enabled WiFi on the tablet and got remote panel working perfectly. It is just the physical USB connection to the tablet via OTG cable that is creating the problem after sometime
I came to the conclusion that the problem could be with the 32 bit drivers (the display gets stuck only after sometime though), OTG cable (i tried another one too) or that the tablet is running on 32 bit OS. I even installed LV 2013 on the tablet, developed a test exe and tried getting remote front panel, still the same problem persists. Any inputs as to what the problem might be?
Thanks
Arya
Solved!
Go to Solution.

If the WIFI works, I would just use it. Alternately, I would look into a better cable. With cut-rate calbles the first place thay start trying to save money is with the connectors.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

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

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?

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.

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

ASK remote front panel

hai bro i try to remote panels with labview 8.0 professional with this information :
http://zone.ni.com/devzone/cda/tut/p/id/4791
http://zone.ni.com/devzone/cda/tut/p/id/3277
and it's done, for example i give it name test then i start the web server it's works well.
but when i try to connect again with remote panel connection manager and open the project (test)
the remote panel connection manager says that they can find it certainly i've save and open it with the same name and folder where i save the project.
can youm tell me why i can't do that?
tanx before, sorry for bad english

What do you do differently the second time from the first? Are you opening it up differently? Are you using an executable? It doesn't look like it from your description but if you are there is a link below that may help. do you have a firewall up or a proxy server? The second link may help if the problems are being caused by one of these.
KnowledgeBase 3U5H27MY: How Can I Use Remote Front Panels With LabVIEW 8.x Executables?
KnowledgeBase 2ZAC2IEG: Remote Panels Through a Firewall or Proxy Server
Vince M
Applications Engineer

Remote front panel

Hi, I'm new to labview. Now i have a program which is running in server mode. The application also build for the remote front panel. So my question is whether the client use the remote front panel to download the require file from the server to client computer under different 2 networks ? Thank you.

My main vi is just displaying data in graph where data are from MODBUS module which using LAN port. The main vi will gain all the data and generate a file (such as Excel file) after clicked a button. This file is generated at the server computer. With this function, i also published the front panel into web which is remote front panel. So now i want to generate the excel file by using another computer (client computer) access through the remote front panel to generate the file and the file is save to the client computer. The two different networks i mean was the server computer and the client computer is not connected under same network. So i want ask that whether remote front panel can do this function or not? If yes, then how to do it? Sorry that let you confuse

Remote front panel reconnection problem

Hello,
I have created a real time application build for myRIO and i can succesfully run it as startup. After MyRIO reboots, through the Project Window i select Operate/Connect to Remote Panel. I enter the local network IP address 192.168.0.101 and port 8000 and the Front Panel of the Startup VI opens. I run it and everything is running as expected.
This setup is installed on a UAV and acquires data from scientific instruments all data is writen on a USB flash drive on myRIO
It is expected that sometimes the local network link will break during the flight. To simulate this i unplugged myRIO from the ethernet cable will the Data is saved.
I noticed the following strange things:
1. At time X i connect to the remote panel and i start the DAQ which acquires data
2. At time X+10 minutes i unplug the ethernet cable which connects myrio to the local network
3. At time X+20 minutes i poweroff myRIO
I was expecting that after the connection was broken the VI would have kept acquiring the Data until myRIO powers off.
Instead i noticed that myrio acquires data for only 1 more minute after the ethernet cable is unplugged.
It is very important that after the UAV takes off whatever happens to the network connection the VI keeps acquiring data for as long myrio is powered on.
I also tried the web publishing tool but i could not connect using a browser. It seems that the web server was not running properly. I also noticed that the html file was not located in the target destination folder. I tried to manually copy it using a map networked drive but the file could not be copied.
I will appreciate any help on the above issues.
Thank you,
Christos

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?

Remote Front Panel in LV RT?

"Getting Started --> Operate --> Connect to Remote Front Panel..." allows me to connect to a remote front panel (obviously). However, the program I am creating will need to be accessed by users with the runtime environment but not the developer environment. It seems that this is possible through the VI-in-a-web-page sytem, but that looks to me as though it would be pointlessly complicated compared to Connect to Remote Front Panel.
Is there a way for a "runtime only" user to Connect to a Remote Front panel, such as by a small application build or even something in the runtime download itself? If not, am I at least correct that the VI-in-a-web-page functionality alows remote VI control for "runtime only" users?
Edit: Waaaaait a second... is that option available to any application I make? I thought it was just on the Getting Started screen.
Huh.
(If I'm wrong about something here, feel free to correct me.)
Message Edited by DJDDA on 01-29-2008 04:41 PM

Okay... I don't think I made myself clear, and I guess I didn't understand the response. Let me try again. Please ask for clarification if you do not understand, I need to get this working.
A want a client with only the run-time environment to control one of my VI's remotely. I have not been able to make this work.
I DO NOT CURRENTLY HAVE LABVIEW "REAL TIME" (oops).
If I have a VI running in the development environment on the server, should the client be able to Connect to Remote Panel? (I'm guessing no.)
If I have a LabVIEW Application running on the server, should the client be able to Connect to Remote Panel? (I'm guessing no, at this point.)
If I have a VI running embedded in a web page, should the client be able to control it? (I'm guessing no, but I'm not sure.)
Is it possible to embed an application in a web page if the server does not have LabVIEW Real Time on it? (I'm guessing no, at this point, but again I'm not sure.)
I can easily control the VI remotely (in various ways) with another development enironment, but I need it to work for a run-time environment user.

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

Able to interact with a cRIO remote front panel from one computer but not another

I have a cRIO application that publishes a remote front panel for monitoring and control of the application. From one PC (Win7 & firefox) I can see, interact and control the cRIO through the published remote front panel. From a second PC, also Win7, I can see and monitor the cRIO's state, but the remote panel that is opened does not allow for any interaction and this is true whether I'm using IE, FF or Chrome as the browser. When either PC is connected to the cRIO, it is via a dedicated Ethernet link and only the cRIO and the one PC are on that network. For this two-device private network, the PC is always at address 192.168.1.1 while the cRIO always uses 192.168.84.199 (port 8000).
The firewall rules on both PCs are setup to allow all incoming and outgoing programs/ports/protocols to be used between these two IP addresses.
Both PC's have up-to-date LabVIEW development systems installed on them (which more or less guarantees they have the minimum require LV runtime needed to see and use a remote front panel).
What might be different on the PC that view but cannot interact with the remote panel?
Solved!
Go to Solution.

Sam_Sharp wrote:
Right click on the second one and select "take control of this VI".
As far as I am aware - only one viewer of the remote front panel can control the panel at any time - the rest can only view.
As I tried to say in my original post, there was only one host physically connected to the private network at any given time (by virtue of the fact that the one Ethernet cable connection to the private network was being moved back & forth between the two hosts) so there was no way both hosts could be trying to control the cRIO at the same time. I even went so far at one point of restarting the cRIO while it was connected to the problem host to see if would render it functional, but it did not.
But I did not know that it was possible to do what you suggested, much less that there was a right-click context menu associated with a remote panel, so I tried it and it worked! Thank you!

Remote front panel connection

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