Fix position of 3D graph in front panel

Hi I haev used 3D graphs in my VI but whenever I open my vi I see that the position of 3D graph has changed in my Front Panel and it takes a lot of time to rearange everything again. It also change the position of the other things like pics or Tab boxes. Is it something related to the resolution of the screen? and how can I fix it to not change because I want to use my laptop for a presentation and I would like to avoid this mess during demostrating my vi
Many thanks

Hi,
I don't know if it would help, but you can lock the psoition of front panel objects. Select the object and then select Reorder >> Lock from the toolbar:
-CC
"If anyone needs me, I'll be in the Angry Dome!"

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Chnaging input in a waveform graph from front panel in labview

Hi !
I am working with temperature sensors; I have several sensors to read simultaneously.
I want to plot information from different sensors in different plots and have the option to change/select the sensors in the a graph from front panel. For example, I have 8 sensors(please see the attachments_ front panel), A,B,C,D,E,F,G and M. Some time it could be possible that user want A,B,C in Tumor Graph or sometimes only A and B. That means the identity and the number of sensors could be changed in different times.
Now I connect only two sensors per graph (ref: block diagram) but the number and the sensors to be plotted in a certain graph can be changed, so How can I implement it ?
Any help or idea will be appreciated.
Best Regards,
Hasan Masud
CTH, Sweden.
Attachments:
random graph_front.jpg ‏260 KB
random graph_block.jpg ‏298 KB

Hi hasanma,
Well, you could expend the build array and add more inputs to it as shown below:
And individually select which sensor data the user wants to view as shown below:
Warmest regards,
Lennard.C
Learning new things everyday...

How can i edit graphs on front panel?

Hello!
My problem is the following:
I need a front panel, where i can edit the graph. It doesn't need to be very complicatted. It means, there is 5 steps. For example: It will control a thermal chamber, and it should give 25 celsius for 2 hours, then cool down until 2 hours to -40 celsius, 4 hours on -40, then back to 25 celsius until 2 hours, stay there for 2 hours, up to 105 celsius until 2 hours, 4 hours on 105 , 2 hours down to room constant, stay 2 hours there. But i need to be control the levels. The temperature levels, and the time periods. It's nessesery to control this on front panel. I've found a vi , which is reading in *.lvm files with datas x,y and then it's interpolating. But it is not setable after setting.
Please help me. Thank You very much!
Solved!
Go to Solution.

If you want to specify the profile graphically then you can use cursors to do it. An old example can be found here. You may find others by doing your own search (hint, hint).
Otherwise, you can simply use a multicolumn listbox to specify the indvidual profile segments, and a graph can be used to display the entered profile whenever the listbox changes.

How to data log graphs using front panel data logging?

Hello I have a VI that collects data from DAQmx thermocouple readings and graphs the temperature vs time using a while loop to collect data and graph. I have 9 control operators that define the correction factor of the thermocouples.
I want to create a datalogging using the option under Operations>Data Logging
When I retrieve the data the only information that is present are the control operators correction factors that I defined. The graphed data that was created is not retrieved.
Is there a solution to show the graphed data plots that were created on the front panel? They remain unchanged from the last run of the VI or blank if I open the VI without having ran the program.
Thank you.

This is expected for the Data Logging in LabVIEW. If you want to record the signla data, use the Write to Measurement File Express VI. Here's a link with a walk-through:
http://www.ni.com/academic/students/learn-daq/data-logging/
The Data Logging from the Operate Menu is for recording front panel control(s), as you have observed.
Mark P.
Applications Engineer
National Instruments
www.ni.com/support

Automatically turn on/off channels graph or front panel

Hello,
does anyone know if Labview is capable of selectiing what channels to view?
for instant during ablation testing. i would not like to select the last 3 channels
but during temperature response. i would like to see all channels.
is it possible or i have to manually click it on the front panel?
thank you in advance.

Use a property node to 1) set the "active plot" (the plot you want to mess with in the following properties) and then 2) set plot visibility. As long as you know which plots you want active, it is simple programming from there.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Auto position buttons under array on front panel

In my gui I have an array of clusters that I am auto-sizing based on number of rows property node. I have a delete and ok button under the indicator for the array and would like to position the buttons at the bottom of the array. The easy solution is to put the buttons to the side of the array, but I'd like to make this look nice and have them appear at the bottom of the array no matter how many rows are displayed. Any suggestions?
I've looked into position property nodes which give the option of top and left, and wanted to calculate the bottom from the height, but haven't figured out how to do this.

Not sure what the difficulty you're having is. The Height property gives you the height of the array, in pixels. Perhaps you're having a race condition. I'd suggest posting your code.
Of course, one issue is: what happens if the array is set to display so many rows that it extends beyond the size of the panel's window height?
In general, I'm not a fan of user interfaces where buttons start moving on me.

Problem Printing Front Panel

I'm having a problem printing the front panel of a particular VI. When I set the print option to Standard Printing the printer prints nothing. When set to Bitmap Printing it works, but it's not the type of printout that I want. In both cases the Print Preview appears the same. Also, all my other VI's print in Standard Printing mode with no problems.
I've read other posts indicating that the cause may be that the VI is sending a print code to the printer telling it not to print. How can I determine if this is the case? If it is the case, how do I fix it? This VI's front panel has nothing special about it relative to other VI's that print correctly.
Any help would be greatly appreciated.

If it happens using the menu, then it's not that your code sends a "do not print" action to the printer.
Try copying front panel items, one or two at a time, from your wonky VI to a new VI, and print the new VI after every move.
Maybe you can find one item that causes it.
If you're on a Mac, print it to a PDF file, and see if that's OK. If you're on Windows, you can use Print2PDF or something similar to act like a printer and show you what the printout would be.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
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How to show the front panel when launching VI with Call by reference node??

Hello!
I just wonder how I make the front panel visible during execution when I launch the VI with CALL BY REFERENCE NODE.
Se example.
Could u also show me how to change different properties (window size ..) of the front panel??? (launched with CALL BY REFERENCE NODE)
Thank you!
Attachments:
test.vi ‏18 KB

In VI Properties>>Window Apperance>>Customize you can check "Show front panel when called". This will open the front panel on each call. It doesn't matter how the call was initiated.
You can set a lot of Front panel properties during runtime. Place a Property Node in the block diagram. Change the class from App to VI. Under properties select Front Panel window>>Panel bounds to set the position and size of the front panel.
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

Enabling / Disabling graphs and opening a new Front Panel Window

Hi,
I have a simple application of showing 12 analog signals on 12 different graphs placed vertically in aligned position. I have to develop a user interface so that if user wants to display signal no. 1, 4 and 6 out of total 12 signals, he should make selection using check boxes and click a re-draw button. It should result in opening a separate window with these three signals displayed as separate graphs aligned vertically and adjusted to fit window size. Similarly later user can change his selection of displaying signals (from same acquired data) say 1, 3, 5, 6, 8, 9, 11 & 12 and click Redraw button. It should result in opening a new Window showing all these signals as separate graphs which are aligned vertically and resized to fit the window. Now I have two major issues in this context.
1) I have been searching LabView help to locate a way to open a new window for this purpose but I failed to locate any way for it. As per my limited knowledge, it seems that we cannot have multiple "Front Panel" windows in Labview.
2) For the graph I could not locate a control to enable/disable a graph so that it appears or vanishes. Is there any way to achieve it?
I shall appreciate your valuable advice. I shifted from "Lab View Signal Express" to "Lab View" in order to achieve this user interface design but I am still not successful in finding a good solution for this application.
Regards
Mnuet

Hi Mnuet,
You can do what was said above. Here is a KB on dynamically loading VIs. It looks something like this.
Dynamically loaded VIs are loaded at the point in code while running, as opposed to being loaded when the parent VI is loaded into memory like normal subVIs. You can make a reference to them and then control the front panel appearance, their run status, etc with property nodes and invoke nodes.
Jeff | LabVIEW Software Engineer

Refresh graph properties (colors...) when front panel not opened

I have a problem with setting the plot properties of a multiple xy-graph.
I first pass the data (n plots, number variable) to the graph control, THEN I set the according properties like color, line style etc. by a property node beginning with "active plot" followed by the properties. So when I set them, the xy-graph is already initialized with n plots.
Afterwards, I take the graph picture and save it to a bitmap-file.
That works fine as long as the front panel is opened or the number of plots and their attributes stays constant. But if the panel is closed (which is the default of that VI) and the number of plots changes, I get only as many plots plotted correctly as there are shown in the plot legend
- regardless of if the legend is shown or not.
I don't like the idea of having a huge legend on the panel which still might be too small sometimes or having the legend scaled by it's height-property in pixels.
What I need is something like a .refresh-method that forces the graph to update even if the front panel is closed. Any idea how to do this?
Cheers & thanks, Daniel

The issue you are seeing is because LabVIEW doesn't update the controls/indicator of a front panel that is not open. This is done to save computer resources. The simple way around this is to use VI server to open the front panel for it to update and then close it again. You can use the VI property FP.position to move the window offscreen where it can't be seen and perform the open/close. This will get you the results you are after while still allowing the illusion of a closed front panel.

How can i use the same front panel graph in more than one events in an event structure?

i want to display the signals from my sensorDAQ in a graph.but i have more than one event in the event structure to acquire the signal and display it in the graph.the first event is to acquire the threshold signals and its displayed in the graph as a feedback.after the first event is executed, i will call the second event,where the further signals are acuired and compared with the threshold signals from the event 1.my question is how can i use the same front panel control in more than two events in the event structure?please answer me i'm stuck.
Solved!
Go to Solution.

Hi,
I have attached here an example of doing the same using shift registers and local variables. Take a look. Shift register is always a better option than local variables.
Regards,
Nitzz
(Give kudos to good answers, Mark it as a solution if your problem is Solved)
Attachments:
Graph and shift registers.vi ‏12 KB
graph and local variables.vi ‏12 KB

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)?

My front panel controls are disappearing after the vi starts. Anyone one know how to fix this?

I have some vis that ran fine on an older machine, but with the new computer controls on the front panel dissappear after awhile and can be made to reappear after closing and reloading the vi. I am not doing any programmatic hiding of any controls. The controls can also be made to reappear by stopping the vi and selecting them with a tool, but then they disappear again when you run the vi again. I played around with "bring to front" but that doesn't fix the problem and read a post about OpenGL problems associatted with 3D controls. Any ideas on what to try to fix the disappearing controls?
I

If you right-click on the terminal and choose 'show control' and then the control can be seen, then it is not hidden behind other controls, decorations, etc. Just to ask a dumb question: have you right-clicked on the terminal and tried Find --> Property nodes to make sure that the control(s) is not being hidden somewhere in your code? Are you passing any control refnums to any subvi's?
"There is a God shaped vacuum in the heart of every man which cannot be filled by any created thing, but only by God, the Creator, made known through Jesus." - Blaise Pascal

Graph stalls when front panel is adjusted

So I am trying to debug a code that someone previously wrote. I am a bit familiar with the code but as I mentioned did not write it myself. The deal is that when Im in running the front panel and the graph is graphing time vs any other parameter, if you press any button on the front panel or if a sub-vi gets called the graph will stall and one has to manually reset the graph. I am not too sure why this is going on. Attached are a few screen shots of where this section of the code lives. There is a stacked sequence with two subdiagrams and it is also being called in the event structure inside one of those subdiagrams. I could also upload the whole code if needed.
Thanks for the help guys
Attachments:
Graphing front panel.doc ‏456 KB

OK, I was able to get to the code by selective unzipping.
As a first step, you should eliminate all these value property nodes and replace them with plain local variables instead. The code os causing excessive thread switching and spends way too much time in the UI thread.
Overall, there is way too much code. For example you have in the "graphed parameter" event the same property node in every single case of the inner case structures. These property nodes belong after the case structure, only once instance each needed!
(Sorry, I have to do some other things now. Will look at it a little more later.....)
LabVIEW Champion . Do more with less code and in less time .

Bug: Front Panel objects relative position change when placing merge VI onto Block Diagram

I've posted a bug report on LAVA, here:
http://forums.lavag.org/Front-Panel-objects-relative-position-change-when-placing-merge-VI-onto-Bloc...
If someone at NI can reproduce, can I please get a CAR #?
Thanks,
-Jim
Solved!
Go to Solution.

Donovan B wrote:
Hi Jim,
After my previous post, I also saw this behavior, so I decided to do another test. If there are no decorations in the VI set to “Merge VI” (“Place VI Contents” for LabVIEW 8.5 and later) the controls and indicators are still not selected when dropping the VI from the Functions palette. I checked this behavior back to LabVIEW 7.1 and it is consistent throughout that controls and indicators are not selected. (Consequently, so is the fact that when decorations are present they don’t maintain the relative position).
I am not sure if this would be better suited as a CAR or product suggestion since it has been this way that long, but it does not appear to be related to the fact that decorations are present in the Merge VI. It does seem strange that the decorations are selected though. Looks like the best way to work around this is to drop the VI from the Controls palette. Hopefully, it’s not too much of a hassle.
Hi Donovan,
Thanks for checking in.
> I checked this behavior back to LabVIEW 7.1 and it
is consistent throughout that controls and indicators are not
selected. (Consequently, so is the fact that when decorations are
present they don’t maintain the relative position).
This just means that not many people use this feature. However, now that VIPM Professional makes it so easy to edit the palettes, I'm sure that others will start complaining that this doesn't work as they expect.
> I am not sure if this would be better suited as a CAR or product suggestion
since it has been this way that long, but it does not appear to be
related to the fact that decorations are present in the Merge VI.
Just look up the functional specifications for this feature and see if all objects are supposed to be selected.
But seriously, is there a reason that only the FP decorations are selected? Surely this would be documented somewhere, if there was a good reason for this current (IMO, buggy) behavior.
> It
does seem strange that the decorations are selected though. Looks like
the best way to work around this is to drop the VI from the Controls
palette. Hopefully, it’s not too much of a hassle.
That's not a reasonably work-around, IMO. It doesn't make sense to drop Block Diagram components onto the Front Panel. For example, this bug affects the JKI State Machine. It doesn't make sense to drop a State Machine onto the Front Panel.
So, I'd file it as a CAR/bug, and then wait to see how LV R&D feels about it. If they can find some valid reason for why Controls and Indicators shouldn't be selected, then that's fine (and hopefully someone will explain it to me).
Thanks,
-Jim

Fix position of 3D graph in front panel

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