Using .mat as a control in LABVIEW

Hi everyone
I am interested to use .mat data as a control in my LABVIEW program.
As a simple program, if I display control value on any indicator I use only one control and one indicator. Now I am interested that control value would be the same value as it is on .mat data stored any directory.
Thanks
Best Regards
Muhammad Abul Hasan

Did you refer to Mathscript node ?
Unless there is application requirement where your matlab workspace variable values are changing dynamically with LabVIEW running in parallel, mathscript node will work.
Else, you can use ActiveX call for Matlab and poll the workspace variables in matlab.
-FraggerFox!
Certified LabVIEW Architect, Certified TestStand Developer
"What you think today is what you live tomorrow"

Similar Messages

How to use the drop event of the tree control in LabVIEW 8.20?

Hi,
I am using the two tree controls in my application to provide a option for the user to drag and drop item from one tree to the other. I have to validate the user selection. I tried to capture the user drop event using the event structure. The problem I am facing is, I am not able to drop the item even though i have wired a constant true to the filter(Accepted?) in the event case. I have enable the property(Allow droping) in the right menu of the tree control also.
While configuring an event case for (drop, drag entered and some thing like this) only I am getting the problem otherwise it is working fine.
What do i need to do to caprture the drop event ?
Is there any way to avoid the item duplication while droping a new item in the tree control ?
or how can i do this?
Thanks,
Pandiarajan R

Hi Pandiarajan,
I hope you are doing well today! There is a lengthy discussion on the Tree Control Drag & Drop feature at this forums post including contributions from the developer of the Drag & Drop feature:
Tree Control Drag & Drop in LabVIEW 8
By avoiding item duplication, do you mean that you don't want the same item to be in the old tree control or do you not want more than one item in the new tree control?
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

How can i use activeX Control in labview?

how can i use activeX Control in labview?
please describe me step by step.
thanks.

Well..that was quite helpful..but now I'm encountering certain problems. I've attached the VI I've made.
I don't need sound at the moment so I dropped it. (Although I tried to play it..but all I could hear was a very annoying sound.) Secondly I don't want to display any date or time..so i dropped that property too.
Now when I run this Vi...the webcam turns on, the screen of videocapx pops up..then the webcam light goes off..and another pop up appears saying..labview is not responding..and i have to close it reluctantly.
I haven't placed the stop capture property in this vi. i checked it by placing it too..but that doesn't work.
I would like to notify that my actual task is to acquire image and then compare it with another one already present on my pc. I want you to please help me out..solve my first query then I'll proceed with the latter part.
Attachments:
activexvideocaps.vi ‏20 KB

I am using Activex controls from Labview to log the data into Excel spreadsheet. My applica

tion is running fine without giving any error messages. But even after the vi stops, excel process does not shutdown. "Excel.exe" process keeps running until I end it from Windows NT Task Manager. Is there any way to end the excel.exe process from Labview?

tion is running fine without giving any error messages. But even after the vi stops, excel process does not shutdown. "Excel.exe" process keeps running until I end it from Windows NT Task Manager. Is there any way to end the excel.exe process from Labview?I use Excel Active X control frequently to save and then analysis test data. In order to properly destroy the "Excel.exe" process it is important to close all the automation refnums opened when using the Excel active x controls. After completing your desired Excel task wire all the refnums in reverse order they were created into the Automation Close function in Functions->Communication->Active X pallette. This includes all Application, Workbook, Worksheet, or Range refnum. Missing even one of these refnums will mean that Excel.exe will still persist in the task manager and cause problems when excel is opened from outside LabVIEW. I hope this helps.
Stephan

When using classic dialog controls in labview 7.1 why does the text color that I have selected always stays black?

I have an older program created in LV 6.0.2 that uses dialog buttons. The text color is red or blue. When I load it into LV 7.1 the color stays black. When I edit text I can see that the color is correct but it will not display the color when I leave edit mode on the control. Even if I select a new button from the classic tools pallete "dialog controls" I am unable to change the text color.
What is happening? Why does LV 7.1 prevent this text color change?
Roger

The dialog control colors are set by the operating system so they match other controls that the OS generates. So in LabVIEW 6, they were actually not behaving correctly.
The following text is from the LabVIEW help on Dialog controls.
"You cannot customize the appearance of the dialog spin control, slide controls, or progress bars because the controls and indicators use platform-specific drawing functions that do not support customization. You also cannot use Property Nodes and Invoke Nodes to customize the appearance of these controls and indicators."
If you need different text color, you'll have to use the non dialog controls.
Ed
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.

Using IMAQ Image controls in LabVIEW steps

Hi guys
So far, I was using TestStand 4.0 together with LabVIEW 8.5 and Vision Development Module 8.5 with no problems. Recently, I've updated to LV 8.6 and VDM 8.6. I've started to experience weird problems when using LabVIEW steps with inputs/outputs containing IMAQ Image controls. When I try to click on such a step in seq editor, or try to insert a new step into the sequence, the step initialization takes a very long time (tens of seconds) or freezes completely. I've also tried to upgrade TS to version 4.1, but no difference. Also, my colleague experiences very similar symptoms on the same software setup. The only difference is that on his machine, it takes only a few seconds when you click on the vision step. However, the steps not containing an IMAQ Image control behave normally, i.e. you can't experience any "initialization time" when clicking on them in the sequence.
To illustrate, I'm attaching a simple VI containing nothing more that a single IMAQ Image control. If you don't link it to the connector pane, the VI works fine when inserted as a TS step. If the IMAQ Image control is linked to the connector pane, TS freezes when inserting such a step.
Vladimir
Solved!
Go to Solution.
Attachments:
ft5.vi ‏5 KB

Hello Vladimir,
Thank you for posting on the NI Discussion Forums. This was reported to R&D (#123249) for further investigation. The only workaround I can offer for now is to work with the VIs from version 8.5 of LabVIEW if they have vision controls linked to the connector pane. Thanks for the feedback!
Chris_G
Sr Test Engineer
Medtronic, Inc.

Tension control in labview using PCI 7354 Motion Control Board

I want to make a program for web tension control of roll to roll system in labview using PCI 7354 Motion Control Board. Is there any interface program that can convert my controller output in a format to be directly used as the input of PCI 7354 (Motion Controller Board) for tension control?
Thank you!

thanks for your reply, i have already make the code of a straight line move and the motor moves successfully, but know i want to put the H-bridge to be able to make a reverse direction for the motor, for your information i only use a PCI-7340 controller and a UMI-7774, where the controller connected to the UMI-7774, the UMI connected to a PWM circuit and the PWM connected to the DC-motor, so what do you think i can do?

DC motor closed loop control through labview using usb 6008

Hello
i am doing a project in which i want to control the speed of a DC motor (PID control) through labVIEW 2010. I am having a DC motor, a drive unit that regulates the voltage to the motor by getting analog voltage from 0 to 3.3V ( it can be used for both directions) and i also have a NI usb 6008 board. The problem is that i can't feed the usb 6008 with the digital signal from my hall effect speed sensor. Is it posible with this setup to control the motor?? I can also try to use the pulse as analog input and trasform the frequency into rpm's. Then i am thinking of generating an analog signal to feed the motor drive. If you have any further suggestion of a probably better hardware setup would be more than helpfull to me.
Sincerely
Jason Chaloulos

Hello Michael
Thanks for the reply. I came across those topics before and all of them are trying to generate a PWM signal as output i want to use just an analog signal output so timing on the output is not that important i guess. i am struggling on getting the frequency from the digital input signal that my hall effect sensor generates. Since the maximum speed of the motor is 3000 rpm and with my tooth wheel the maximum output frequency of the sensor will be 300Hz which i see its way less than the limitation of my ni board. Is there any tutorial documentation that might help me with this one ? Thank you in advance.
Kind regards
Jason

Is it possible to create user defined control in labview

in .net we can create user defined contol in which i can put more then one control and,, can use it as single control when needed,, but,, how this possible in labview,,
actually in my program i have a tab control and,, in that tab control there are 8 pages,, now there are 5 different kind option selection for each page lets say "a" "b" "c" "d" "e",,,,,.,. so,, when i select "a" configuration for tabpage 1 should show.. "a"(control collection) on tabpage1....and,, same should b possible for all 8 pages............................. this can possible if its possible to create user defined contorl in labview
while in .net its very easy task i m confused here,..,.
i put these controls in another 5 different VI,,,, and tried to call in subpanel but,, i dont find the solution,,,
Attachments:
tabcontrol.vi ‏1 KB

Hi,
I've tried to open you attachment but LabVIEW tells me it's not a vi... could you check it and repost please ?
I'm not really sure of what you need but you CAN customize you control in LabVIEW, it is not hard, you just have to know how it works
Sometimes being good at another programation language confuse you more than it helps because you try to do as you are used to... the difficulty it to "translate" functions from a language to another.
I do know how frustrating it can be when you think "Damned, it would take me only 5 minutes to do that with language a and after 10 hours with language b it is still not working "
You have to get in LabVIEW way of thinking, I wish you good luck !
A quick exemple... this might not do exactly what you need but it may help you anyway.
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
exemple.vi ‏55 KB

Can I use a colour palette control to set the colour of an LED on front panel?

Hi,
I want to allow the user of my LabView program to be able to set the colour of an enlarged LED on the front panel using a colour palette control also on the front panel. Is this possible or can the LED only be the colour it is set to in its properties dialogue box?
Thanks,
Dave.

The question is of course: "Does it really need to be a boolean LED that has a True/False and all the boolean logic???
If you just want an LED lookalike where the color can be easily controlled programmatically I would recommend a color box indicator instead. You can even customized it to look like an LED! The attached example (LabVIEW 7.1) shows both methods, but the color box option is programmatically much less messy (no bundling, no array building, no property nodes!).
(To make the LED color box indicator, I customized a plain color box and simply imported the graphic elements from the regular LED indicator.)
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ColorBoxLED.vi ‏22 KB

Auto Tune prior to running motion control program (LabVIEW)

Hi,
I am controlling Parker Compumotor (404-LXR) linear servo table via GV6 drive and PCI-7344 motion controller.
The problem is that I always have to run automatic tuning in MAX when I turn off all the system and restart it.
Before I use the automatic servo tuning in MAX, the servo table buzzes and oscillates wildly. Cabling seems to be successful as linear servo motor is completely controlled by LabVIEW after auto tuning in MAX.
I wonder how I can just run my LabVIEW program without running Auto Tune step.

Hello Gino,
Thank you for using our discussion forums. Yes, you can programmatic load the PID parameters from LabVIEW. Tune your servo using auto tune, once you are satisfied with the response look under the Control Loop tab for the PID parameters. In LabVIEW use the Load All PID Parameters.flx and use the tuned parameters from Measurement and Automation Explorer as the PID Parameters input for this VI. Place the VI before the multistart.vi. This will make sure the correct PID settings are used. I hope this helps you out. Have a nice day!
Regards,
Nipun M
Applications Engineer
National Instruments

Would like to monitor and control a labview application with a hand held device.

Would like to monitor and control a labview application with a hand held device.
Would like to use a palm or ipac on a local area network or communicate directly with the PC running windows.

LabVIEW doesn't run on a hand held device. But, check out these documents:
Is it Possible to Use Remote Front Panels to Control a LabVIEW VI Remotely Using my PDA?
"What OS is recommended for LabVIEW to run on a PDA?"

Using IMAQ Image Display control vs IMAQ WindDraw for large image files

Hello All;
I am designing an application that is currently using IMAQ Image Display control to view large images (5K x 3K and larger). My problem is that these images take 10-20 seconds to load and display, whereas if I use IMAQ WindDraw to display my image in a separate window, it only takes a couple of seconds. My application is designed such that I am making use of the Subpanels in LabVIEW 8.0, and to make it pleasant for the user, the interface is such that my line profile, histograph and image viewer displays are contained within the same GUI (panel).
I read the National Instruments application note regarding displaying of large images, and it did not seem to make a difference. For example, I switched the 'modern' IMAQ Image Display control with the classic Image Display control, since the 'classic' does not contain any of the 3D rendering tools which might slow the process down.
Why is there such a huge difference in loading times if I am trying to do exactly the same thing with both methods? How can I bring the IMAQ Image Display control up to the same speed as the IMAQ WindDraw tool?
I am currently using LabVIEW 8.0 with the latest IMAQ/NI Vision package from NI (IMAQ v7.1?). Thanks.
DJH

Use a property node and select 16 bit image mapping. You can create a control for this or whatever you need. If you select the individual elements, you can get enumerated controls.
Bruce
Bruce Ammons
Ammons Engineering

How to generate and use Matlab(R2007) .dll's in Labview

Is there a step-by-step example on how to generate and use Matlab(R2007) .dll's in Labview.
Our experimenal hardware is LabView-controlled and we want to pass
images/2d intensity arrays to a more complex matlab program that will
return an array of extracted data which we want to use in LabView again.
Thank you
Carsten

I recommend having a wrapper created around the matlab dll that converts the datatypes for you. There is a lot of fooling around with pointers involved which is very difficult in LabVIEW. btw, this got much more complicated after Matlab 7. Essentially, you need to convert your inputs into mxArrays, and then add those mxArrays to an mxArray list that you pass by pointer into the matlab dll. You also need to create a mxArray list for the outputs from the dll which you will need to extract your data out of before converting it back into a LabVIEW supported datatype. It's a big hassle. We do this pretty often, but we have created a c library that handles all the conversions, so it is feasible for us. Unfortunately, I can't share the library, but hopefully this information will help you get where you want to be.
Like I said, it would be easier if you can just get a c developer to write a wrapper for you to keep it simple in LabVIEW. Alternatively, you might try getting your m-code to work in Mathscript.
Chris

Off the shelf XY gantry system controlled with LabView

I am looking for an XY gantry system that I can easily control from labview. I need a workspace of 11 by 16 inches with minimum clearance of 6 inches. I was wondering if anyone has used a commercially available XY gantry or has any experience with an XY gantry.
I have found these two tables/brands that already have LabView drivers
http://www.zaber.com/products/product_detail.php?detail=G-LSQ450D450D&tab=Series%20Features#tabs
http://www.techno-isel.com/tic/Catdas/Gantry3.htm
And this one that looks promising too
http://www.animatics.com/en/products/table-top-robot/animatics/table-top-robot/2-axis-ttr-xy-configu...
Both Zaber and Techno Linear do not know of anyone in my area (Loveland, Colorado or Denver area) that I could go visit to see a table and I would like to see a working system before making a decision to buy a new system. I have not been able to talk to an engineer/technical sale representative at Animatics yet.
I am looking at using the XY gantry to position a sensor over a tray of parts to measure some properties of the parts. The system I am designing does not need an high accuracy table (+- 0.005" is fine). I would prefer to spend about $10K for a XY gantry table including any required controllers and hardware.
Thanks,
Brian

You have a good start, but 2 other things that you need to consider are your load and speeds required. This will determine the mechanics of the gantry(ball screw, acme screw, belt, bearing type, etc.). It will also determine if you need servos or you can get away with steppers. You then need to figure what kind of motion you need. Point to point moves can be accomplished with non-interpolated controllers, but any kind of coordinated motion will need a motion controller that can do true interpolated motion.

Using .mat as a control in LABVIEW

Similar Messages

Maybe you are looking for