Front panel slide control

Is there a way to programmically control the scale of a front panel slide control? Like wiring the "i" and "N" of a For loop to a FP slide control?

Thank you miguelc for the answer. Now I can "wire up" to the slider's scale max & min values. So now they are dynamic and not static constants. My slide control's scale now can change dynamically as the "N" (total For loop iterations) value changes a couple times throughout run-time (as well as showing the preogress as "i" approaches "N"), and my progress meter changes according to jobs done and to-do as expected.

Similar Messages

Front Panel Objects control

How can I passingly Disabled all controls of same type on front panel together using a unique Property node?
I try to use the Class Specifier Constant but it doesn't work.
Thanks, Fabio

Hi,
put all these controls in a single cluster and disable that cluster.
regards
Dev

Front panel Tab control gets faded

As soon as i run this VI the front panel get's faded........... can anyone help me out
here is the attachment.
Attachments:
experiment.vi ‏33 KB

Again some problem is with control reference.
I am attaching the VI
Attachments:
experiment.vi ‏34 KB

How can I use multiple front panel controls to be mirrors of each other?

Hi All:
I know this is going to be a strange question, but I have multiple inputs that control one output. This in itself not necessarily difficult, but I have a strange need. If one of the control inputs change I would like this to be indicated by the other controls. For example, I have a slider, numeric and dial controls on the front panel that control RPM. If the slider changes to 1000 RPM I would like the numeric and dial controls to see that change. Is this possible. If so, can you give me advice on doing this. I am using 7.1. Thanks for the help.
John Honnold

What you want is not that hard, but asked for a rather limited times.
Here's a how to:
Drop a slider
Right click Visible items-> Digital display
Right click on the slider Advanced-> Customize
Right click on the Digital display Replace select the control you want to replace it with (a gauge for instance)
Right click on the Gauge Visible items -> Digital Display
Now you have one control with three control options:
This was done in 8.2 but I think the same goes for 7.1
Ton
Message Edited by TonP on 04-06-2009 09:52 AM
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Example_VI.png ‏7 KB

Auto save and auto recover of front panel controls/indicators values

i just want that when i exit from the VI's front panel all controls and indicators current values get saved automatically and when i get back into this vi,those values get recovered automatically.
Like if i incremented numeric control value from 1 to 5 , when i exit from the vi the value 5 get saved automatically and when i get back into the vi ,it shows the recovered value 5 to me automatically.
best regards

I'm Back
I was mistaken when I said the you could select to save either the controls or indicators or both in the Open G Vi's, They are hard wired for both. I made minor changes to these VI's for my app., because I only needed the controls to be saved. The example I am providing uses the Modified VI's, but I've also included the originals.
Modified
Read Panel from INI.vi
Write Panel to INI.vi
Originals
Read Panel from INI.vi
Read Panel from INI__ogtk.vi
The ability to select either or both could easily be implimented into these Vi's using a case selector and an enum wired as an input
Controls only
Indicators Only
Both
Incase you don't have the OpenG toolkit I've provided the necessary files for this example to function
Extract the zip file to your User.lib directory then open Usage.vi
Hope this helps you
Georges Janveau
Attachments:
Config File Usage.zip ‏861 KB

Closing references to front panel objects

Short version of my question: are programmatically generated references to front panel objects (controls, etc.) automatically disposed of when the VI exits?
More details: I'm recursively retrieving references to all the controls on the front panel. (I say recursively because I'm also getting the individual controls from clusters, subclusters, and so on.) I then return an array of control references, which does not include the references to clusters--only standalone controls or the actual controls themselves contained in clusters.
Do I need to explicitly close the references to clusters that this VI generates, or is it unnecessary since the VI will run briefly, return an array, and then exit?
Or another scenario: in a subVI I open a reference to the parent VI. Do I need to close that reference at the end of the subVI, or is it pointless because the reference will be disposed of when the subVI exits anyway?
(I did find this article, which I think addresses my question, but I'm not sure.)
Thanks,
peppergrower

http://forums.ni.com/ni/board/message?board.id=170&thread.id=159571&view=by_date_ascending&page=1
Jean-Marc
Jean-Marc
LV2009 and LV2013
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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!

How to get the position of the stem in control valve using slider control in the front panel

I have created a calibration program for a control valve. Signal (4-20mA) is generated from labview using slider contorl which is given to the valve via DAQ(module 9265) and again the feedback signal from the valve is acquired using DAQ(module 9203).. . There is an input ISO/ISC(Increasing signal to open/ Increasing signal to close) in the front panel.
ISO would set the output to increase from (4-20)mA further opening the valve
ISC would set the output to increase from (4-20)mA further closing the valve
I have doubt, how can i get the position of a stem

Ravens Fan wrote:
If the position of the stem is being sent to the PC through a 4-20 mA signal into your DAQ 9203 module, then you just need to do an analog input read in order to get the signal.
When reading this post, that is what came to mind... So let's see if both RavensFan & I are trying to understand the same thing... Are you saying that the position of the stem is linear (or scaled) to the amount of current sent to it? Meaning a 4mA signal would move it a certain distance, and 10mA would move another given / known distance? Or are you saying that it is calibrated so that a 20mA signal for a certain duration (ms) would move it a given distance? So the scale would be time and not current unless a lookup table is used to adjust the time duration based on the current being drawn...
It's just that I am not familiar with solenoid / drive devices that related to current.. To voltage, yes. To time, yes.. To current, I'm simply saying that I am not familiar with that. Can you tell us more about this stem (mfg / model designation)?

How do I get the Label for a Front Panel Control to appear in the Block Diagram but not on the Front Panel?

How do I get the Label for a Front Panel Control to appear in the Block Diagram but not on the Front Panel? On the Front Panel I am making a complex control that consists of a Slider and a Numerical Input box. Both Controls display the same information and either can be used for Input. When one changs, the other is made to display the same value.
But I only want the Slider to display the Label on the Front Panel, to avoid confusion. On the Block Diagram however, I want both controls to display their Labels so that I know what they are. How do I display the Label for a Control on the Block diagram, but not display its Label on the Front Panel?

No. The Label Visible property is separate for the front panel control label and the block diagram terminal label.
How did you start out with the block diagram's label not being visible? Whenever I drop a control or indicator, the label is always visible on both the FP and BD by default. Maybe there is a LabVIEW option that causes new controls/indicators not to have their labels visible by default, but I have yet to find it. I don't think an item should ever be dropped without the label visible, good LabVIEW coding practice demands that the labels for control terminals on the block diagram be visible so that you know what control or indicator a wire is going to.
That being said, I have seen a lot of VI's posted where the label for the terminal on the BD is not shown (against good programming practice.) I've gone to the BD and right clicked to show the label. Sometimes, the people have an empty label (which will turn off the visibility for both the FP and BD) and I'm forced to add some text of my own into the label so I can figure out what their code is doing. When I add some text to the label, at that time, I find both the BD and FP labels become visible.
Are you dealing with controls that have empty labels to start?
Good programming practices:
1. Always have a name for all of your controls, never use and empty label by deleting the text in the label.
2. Make the labels unique. For example, don't have two controls both called Stop. How do you know quickly know which terminal relates to which control?
3. Always show the labels on the block diagram, so you know the function of a control's terminal. If you want to hide the label on the FP, that's okay.
4. If you want a different label to appear on the FP than whatever you actually called the control, then use the caption. You can hide the label and show the caption. This is useful if you need to programmatically change what the "label" is on the front panel such if you are making an application that needs to change its user interface such as for a foreign language.

Print only a specific control or indicator on a front panel to HTML document

Is there any way to print a specific control or indicator (not the whole front panel) to HTML document? I am trying to print a report that has a graph and some indicator value on it.

There is a VI called "Append Control Image to Report.vi" which will allow you to do this. It's located in the Functions>>Report Generation pallette. Take a look at this and see if it's what you're looking for.
J.R. Allen

Can I have an array of controls without having them in the array front panel holder?

I would like to link a number of boolean control buttons in an array without grouping them on the front panel the way it does when you make an array and then put in a boolean control.
Here's the background:
I have 8 linear motors controlled by CANbus, and so each button type (Move, Stop, Home, etc) is duplicated 8 fold. I have an event structure that is currently triggered with a separate case for EVERY button with only a very small difference in the code inside each case. Ideally I could have the buttons in arrays and then check the new array value against the old value on a value change event. The alternative for me is to have each case handle the 8 buttons (with a Mouse Down? filter event) and then use the Boolean.Text value from the CtlRef and search an array of all Boolean.Text Values for the 8 buttons to see which name matches and process accordingly. I have something like 200 buttons, so making the arrays of Boolean.Text values from the reference nodes is WAY too time consuming as I have to go through like 5 levels of right click menus. Any suggestions?

Mark,
You might consider using clusters on the front panel. Create a type def'd cluster that has all the boolean controls for 1 channel. You can drop 8 of these on the front panel and the event structure can detect a change in a cluster. Easy to convert cluster to array behind the scenes. Remember that order of cluster determines index of value in array.
Message Edited by Wayne.C on 04-09-2010 05:19 PM

Reference to control on main front panel fails when subvi front panel is closed?

Hi All,
I'm experiencing an odd bug. In my code, I use a subvi to control a piece of hardware. This subvi has controls for all of the functions of my hardware.
I'm changing the value of one of these controls from my main front panel by running a reference to a knob on my main front panel into the subvi, grabbing the value of the knob with a property node, and then updating the value of the subvi control using a signaling property node.
This works fine when my subvi front panel is open but fails to work at all when the subvi front panel is closed.
I'm new to labview , so any help is appreciated.
Thanks,
Arpan
Solved!
Go to Solution.

What is your LabVIEW version?
Front panels that are not shown are typically not updated and might not even be loaded into memory.
The presence of certain code elements (e.g. property nodes) often forces the front panel to be in memory even if it is not shown, but I haven't studied it in a long time so there might be subtleties. Maybe somebody from NI can give more details.
If it does not work unles the FP is open, open the front panel minimized to avoid distraction.
Can you attach some code? Maybe there are better ways to do all this anyway.
LabVIEW Champion . Do more with less code and in less time .

Front panel controls show up one at a time

When I first open my main vi the controls on the front panel appear one at a time over 20-30 seconds. The problem was compounded when a second front panel was made switching between the two the controls for the second panel pop up one at a time and after they all appear the first panels controls go away one at a time. Any ideas on why this ocurs and how do I fix it so the transition happens quickly?

BenThe code is modeled on a vi that was done under LV5 and was also ported over to new computers and LV8. We had to install the traditional drivers to get that code to run on the new systems. The original vi transitions fairly quickly. The new vi is modeled on the original code with efforts being made to strip it of the overhead bagage. ie.the sequence structures and controls no longer needed..... The new code from the begining has sequentially brought up each control with each new control being added it progressively gets worse. With the addition of the second front panel in the same vi the protracted transition of the controls became a significant issue.
Bob
Attachments:
20060817.zip ‏2692 KB

"Shared Variable Control" combo box on Front Panel is empty after Build

Hello;
I have a project using shared variables and the DSC module. I am working on building a .exe application now that the project seems to run well.
I have several places on the front panel where I have shared variable controls. These combo boxes allow the user to click the drop down button and browse the list of shared variables in the project, as well as "browse". When I run the VI from the project, the combo boxes fully populate with all of the deployed tags in the project (I have only one .lvlib in the project).
When I build the project and run the executable, the only item in the combo box list is the "browse..." selection. I can click on that and browse to my variables, but it is much more time consuming to do so than to simply select the desired variable from the drop down list.
So, how can I populate the list of shared variables from a particular library ino the Shared Variable Control combo box in a project build?
A couple of things I have done to try to esolve th problem are ensure that the "Enable Enhanced DSC Run-Time Support" box is checked in the advanced tab of the build window, added the appropriate .lvlib file to the "Dynamic VI's and SUpport Files" window under the "Source Files" tab of the build window, and properly deployed the tag library programmatically in the project.
Thanks,
Michael Hampson
Michael Hampson
President
XL Automation, Inc.

Hi Michael,
What you see in the development environment is to make it easier for developers, and as far as I know, there's no way to automatically populate the shared variable control during run time in an executable. The reason being that the shared variable control would have no way to know which process it should be using to get the variables from. The attached vi demostrate how you can acquire the list of shared variables in a process. You can also set the default values of the shared variable control by right clicking it on the front pannel, go to Data Operations->Make Current Value Default. I can do some more research on this, but I'm about 95% sure that there's no way to convert the array of shared variables to populate the shared variable control, as the shared variable control is a special type of xControl.
Yi Y.
Applications Engineer
http://www.ni.com/support
Message Edited by Yi Y on 07-02-2007 01:27 AM
Attachments:
SharedVariableList.vi ‏15 KB

How to show or hide a control in front panel

Hi All, I am revising the code from someone else, and a control in front panel seems to be hidden until you click something to make it show. I tried to use right click in front panel and it did not work by clicking something related to show or hide. Since I don't quite familiar with property nodes, this hidden setting may be related to that.
In the picture it shows the front panel and its two property nodes, could anyone advise me how to change the setting to show this control? Thank you!
Solved!
Go to Solution.

If you right-click on the the control's terminal, you will see an option to "Hide Control" or "Show Control". This is what you should use when editing the code. The property nodes set to Visible are for when the application is running.
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Attachments:
change visible state.png ‏3 KB

Front panel slide control

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