Controlling stages- labview program enough?

Hi ,
I'm putting together a new setup with XYZ stage, rotational and tilt(goniometer) stages. I have a ESP7000 controller unit.
If I purchase the labview program (only the basic, without any add-ons) Can I control my stages and do some closed loop control ?
Thank you.
Ozan.

Hi Ozan,
I checked out a couple other Newport ESPXXXX Motion Controller/Drives on Newport's website and it looks like they have a library of drivers for working with their motion controllers through LabVIEW. I wasn't able to find a product page for the ESP7000, but I found one for the ESP6000, and from there it looks like Newport provides "A complete library of LabVIEW™ drivers covering all ESP6000 commands and extensive DLL’s" for the ESP6000. You will need something like this for interfacing with the ESP7000 and controlling your system.
Beyond that, you should be able to use the drivers from Newport with LabVIEW Base Development System to control your system (no other add-on packages are necessary).
Thanks,
Sherrie R
Applications Engineer
National Instruments

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How can I control a LabView VI using a C++ script/program?

Hi,
I am a developer of a satellite communications system that is being used in
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The project is called 3CS. We have built a simple LabView program that uses
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Ryan R. Fligg
Colorado Space Grant College
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Hello fellow Boulderite,
The easiest way would probably be to use the application builder to create a DLL from the VI. The other option is to use the LabVIEW ActiveX interface. There are some examples of using C++ to control LabVIEW in the example library of the NI Developer Zone.

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You better should post your question in the LabVIEW forum - this one here is dedicated to LabWindows/CVI...

Using APT ActiveX methods to create a labview program for BPC 203 3 channel Benchtop Piezo controller

Hi Everyone,
I am really very new to Labview and i am in great need for some help.I am assigned a task where i am supposed to create a labview program to control or moniter a BPC203 3 channel benchtop Piezo controller. I created a program with the help of the instructions provided in the APT-Labview guide provided by Thorlabs.But th program doesnt run . Whenever i try to run it i get the same error which says that "Control HW Communications disabled".I have attached a snapshot of the error message.So i tried to create a small program in labview which would read the volage output.Even there i got the same error message.I suppose there is some mistake on my part which i am not able to correct due to the lack of proper knowledge.Could anyone please help me to solve this problem.A slight elaboration would be highly appreciated.Also i think the error lies in the use of invoke node with the get Voltage output method. I am not sure whether the parameters i have provided to the invoke node are correct.Any help of any sort would be highly appreciated.
Attachments:
Front Panel with error message.PNG ‏202 KB
Block diagram.PNG ‏101 KB

Hi
I had the same problem today. However, I noticed that the piezo controller has 3 channels with separate slots and they are packaged in the same box. Therefore the whole box has a serial number, probably something like 71822280, and this is written with large letter. Now, in order to communicate with any of the channels, this does not help, but one needs to communicate directly with the interested channel and they have thier OWN SERIAL NUMBERS.
For example channel 1 (my X direction in the nanoMax stage) has serial 91822281, Y has 91822282 and Z has 91822283. So try looking if you have the right serial number Hopefully you found out this yourself but this might help others, I took me3 hours to get this thing working when I started to plug-in the cables and everything.
Lasse

Interface labview program with real appliances

How do i interface labview program with real life appliances. For example: interface with light bulb

I suppose you could also find some kind of adapter to turn it into an IP based appliance and you could control it through the ethernet. Or you could wait a few decades and interface LabVIEW 2059 with your cranial implant to directly control your light bulb.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

How to document LabVIEW program?

Is there any guidance for how to document a LabVIEW
program?

The LabView Style Guide has a chapter on documentation. Click here.
Here are some of the things I try to do on every VI.
Create VI Help info: on the VI's File menu, select VI Properties >> Category >> Documentation, then add you help info into the VI Description. That's what will be shown when the user shows the context help (Ctrl-H).
Front Panel:
Create help info for each control: right-click on the control, then select Description and Tip. The Description will be shown when the user shows the context help. The Tip will be shown (as a Tool Tip) when the user moves the mouse pointer over the control, even if context help is not shown.
Make control Labels descriptive. Numeric, Numeric 2, Boolean, etc. are not descriptive enough to be helpful to the user.
Use the control captions if needed.
Use the text tool to add free labels to the front panel if needed.
Diagram:
Show the label for each structure (while loop, for loop, case, sequence, etc.). Not just a free label: right-click on the border of the structure and select Visible Items >> Label. This way the label is attached to the structure and will move with the structure as you're editing the diagram. Make the label descriptive. For loops, summarize what you're doing. For while loop, state when the loop will stop. For For loops, if auto-index is used, state which input will set the number of loops. For cases, describe the criteria for selecting a case.
Within a case or sequence structure, use the text tool to add a free label inside each case or sequence frame to summarize what happens there.
Show labels for all control terminals. Some controls may not have their labels displayed on the front panel (e.g. buttons with their boolean text shown), but always display the label on the diagram.
Liberally use free labels to add more comments.
VI History:
Use it! On any VI window, from the Tools menu (the tools palette), select Options, the select Revision History from the pull-down listbox. Select Prompt for comment when VI is saved. Whenever the VI is saved, add a brief but meaningful comment about what was changed. This history is available under the VI Properties >> Category >> Revision History >> Show Current Revision History (or by pressing Ctrl-Y). It can be very helpful in debugging a program that stopped working after you made a bunch of changes.
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Create helpful (not just artistic) icons. I typically just use text to show an abbreviated VI name. Graphical icons can be helpful if it's clear to the user what the graphics mean. But I like text. I put my creativity into the program, not into a tiny picture trying to describe the VIs function to the user.
I'm glad you asked the question. The more work you put into your documentation now, the easier it will be for you or anyone else to use and maintain your programs.

How do I use directional PDA buttons in LabVIEW programs?

Hi all,
I've been assigned to get a LabVIEW program to work on a Palm PDA with LabVIEW 7.0 and palm PDA module 7.0. I am basically totally new to LabVIEW, and my possibly very simple problem is, the PC program requires input from a serially connected number pad for the 8, 4, 5, 6, and 2 keys which are used as four directions (8, 4, 6, and 2) and an enter (5).
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Oh and I did try to look at the example asteroid.vi but from looking at the input subvi, still couldn't figure out how they assigned the buttons.
Thanks,
Stephen

I can't help with any specifics (no access to the PDA module at the moment and I didn't use the buttons anyway), but I would like to say that it probably would make a big difference if you used LV 8. 7.0 was the first version of the PDA module and was extemely limited and problematic (it didn't even have a tab control). 7.1 was somewhat better and I understand that 8 is even better (although still very limited and buggy).
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Try to take over the world!

Can multiple LabVIEW programs simultaneously access the same NI-DAQmx hardware?

I am developing a test station system that, in essence, runs several
seperate LabVIEW programs simultaneously on the same computer, each
controlling a different set of I/O channels on one shared set of NI
DAQ hardware (analog and digital I/O PCI boards with external signal
conditioning).
I have already gotten a system like this running almost flawlessly
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from more than one program. The only issue I have had is that if
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the classic hardware and use traditional channels for this somewhat
unorthodox application.
(Incidentally, the multiple simultaneous program thing is a
requirement for this system, as it is the only clean way to run
multiple
identical copies of the same complete program that only
operate on different I/O channels, and re-doing the program from
scratch is not an option.)

Dear Anonymous,
Thank you for contacting National Instruments.
To address your question, I don't know if multiple simultaneous access with mx channels is possible, but I do not see why it wouldn't be. The best way to find out would be to test it. I don't have your program or hardware, so I'm pointing you to some Compatibility VIs. These are VIs that look exactly like Traditional DAQ VIs except that underneath they call the DAQmx driver instead of the Traditional DAQ driver. If your device works when you substitute these Compatibility VIs in for the Traditional DAQ VIs, then you'll know the M Series boards will work for you.
Here is the link for information about the Compatibility VIs:
http://digital.ni.com/softlib.nsf/954feaeea92d90918625674b00658b
83/9d67f671bcc6850586256e630059308b?OpenDocument
Let me know if you have any further questions or if this does not resolve your issue.
Thanks again and have a great day!
Chad AE
Applications Engineer - National Instruments

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

LabView (8.2) hangs when using I/O operations with traditional NI-DAQ 7.4.4 after aborting LabView program

Hello!
We have the following problem:
LabView (8.2) hangs when using I/O operations with traditional NI-DAQ 7.4.4 after aborting LabView program
We freshly installed LabView 8.2 (2006) and NI-DAQ 7.4.4 on a PC running Windows XP (Service Pack 3). We built a larger vi that remotely controls a traditional NI-DAQ card (AT-AO-10) on a second PC via NI-VISA 5.0.3. We were successfully running this program until a power failure caused the first computer to crash. After this crash we were unable to start the program again: LabView freezes while loading the vi. LabView itself can be started but freezes when adding I/O operations from the NI-DAQ palette to a block diagram.
We have tried to re-install NI-DAQ 7.4.4, but it did not help. We then re-installed all NI software, but still no improvement. In the end we decided to reinstall ALL software, first Windows XP, then LabView and finally NI-DAQ 7.4.4. This worked. However, after a few days of running the program we had to abort LabView via Windows Task manager and afterward we again experienced the same problem as before: LabView freezes when loading the program.
Obviously, we cannot afford to reinstall Windows every time. Are there any known Windows XP / NI-DAQ issues that might cause the freezing of LabView? We would be very grateful for any idea.
Best regards,
Matthias

Hello Sprice,
Browse the shipping examples according to “Directory Structure” and then select
DAQ to find the Traditional DAQ examples.
There a lot of examples that are written for counters (Counter >>
daq-stc.llb >> Count Edges (DAQ-STC).vi).
What kind of signals are your photons creating? Are they TTL compatible at a certain
frequency? You don’t care about overwriting
your buffer?
Respectfully,
Rob F
Test Engineer
Condition Measurements
National Instruments

Labview program interface

Dear all,
I have a some problem in running my labview program.
I intention is to generate an output voltage by using my machine (by Nanonis), thus I am using their program in Nanoinis program interface. However, I might have make some connection wrongly somehow as it is not working. I want to try controlling the duration of the output voltage, maybe like 10 seconds. However, I must have made an error somewhere in the program as no voltage is generated
I would appreciate if anyone can advice me on this matter.
Thank you.
Regards,
uranus999
Attachments:
RelayOutput(Analog output) (trial).vi ‏19 KB

Dear Lynn,
I understand that it might be difficult to understand with looking at the Nanonis sub vi's. Sorry about that. If I upload a PDF of the block diagram, would it help at all?
Anyway, I should clarify one thing about the program. Actually, previously, I have use the similar block diagram but I have tried to generate the voltage by using a DAQ. This time, since I intend to use the Nanonis programming interface (replacing the wire lines) from the relay output to the programming interface-Open App ref instead of the NI daq. I expected that it should work but unfortunately, although the program work for the NI DAQ, it doesn't for the Nanonis programming interface. Thus, I am seeking advice on what might had happen and what I should do. I am still a new in writing Labview programs, thus I really do appreciate to get all the advice that I can get.
Thank you.
Regards,
uranus999

LabVIEW program crashes after running for few hours

Hello,
I am doing some experiments at the moment which are supposed to last for 18 hours.
Basically, I use a LabVIEW program to control a power supply through a LabJack U6 DAQ. I am currently using LabVIEW 8.5 on Windows 7.
In order to do that, I use a laptop where everything has been disabled such as power management settings, network access is off, windows updates are also off...
As far as I know, the computer can't turn into sleep mode or just shut down (I'm a 100% sure of that actually).
But last night, I started an 18 hours experiment at 5 pm, and when I came in this morning, the program shutted down by itself. Fortunately, the power supply is still providing the voltage I want, but I can't figure out why the program crashes.
When I start the experiment, it also automatically starting saving data in a spreadsheet file (I guess the size of the file should be 36 MB), so it might be a problem of memory access or something.
I really don't know what could have cause this crash, does someone have an idea?
I saw some other threads similar to my problem but I am not running an executable, I am running the front panel directly from the editing mode.

Hi,
thank all of you for your quick answers!
@Josborne : I do not have an error handling in my program. Actually you can look at my program in the attachment file. This is my first LabVIEW program so I've never dealt with error in and error out function... Moreover, what is a log file exactly?
@Johnsold : Yes, I am building an array continously growing over time. Actually, my program stops saving data when you hit the "STOP" button, it doesn't write into a spreadsheet file through a period of time, that is something I eventually need to correct.
@LabJackSupport : I can try to reduce my time step, so far it's 100 ms. I have a problem with disconnecting the USB cable from the computer though : for no reason, if I just unplug the connection between the LabJack U6 and the computer, my power supply will just go providing 157 Volts! And for my experiment, this is something we don't want to have so we just leave it as it is now. Disabling some part of the program is a good idea, I can try it
Thank you for your answers
Attachments:
Control Software.vi ‏511 KB

Desperate user need help. My GPIB instrument get stuck with my labview program frequently

Hello to all labview users,
i am a beginner in using labview. I am currently writting a labview program to automatically control a digital control rotator HD201e and a network analyzer 8720a to work with the anechoic chamber. The program receives an initial position, amount of increment and # of steps. My program will then ask the controller to rotate to the initial position and at the meantime, the program will monitor the position of the rotator to ensure the requested position is reached. After that, at the position, the program will ask the NA to perform a reading of the measurement. Once the reading is done, the program will ask the controller to rotate to the next position and does a reading of the measurement and so on.
My program seems to be able to perform the tasks; however, the dig.controller part seems to get stuck around 50% of the time when running the program. Sometimes, even the controller receives the requested position (can be seen from the lcd screen of the controller), the rotator just simply would not rotate; also, sometimes, the controller just simply does not respond when sending the command of moving a position, as in the debug mode (the one with a lightbulb), i see that i got "ok" on all the blocks in the writing portion ofthe program, but the controller just doesnt seem to receive the position (as seen no new position received from the lcd screen) and the cursor on the lcd screen blinks weirdly, due to that problem, my program will then get stuck in an infinite loop.....
Usually, that problem occurs after few positions have been reached.....
so, when that happens, i have to stop my program and re-run it. that means the program will have to re-do the measurement that were read previously....
sometimes i have to stop and re-run my program several times to get all the measurement of all the positions done.....so...that bug renders that program to be an unefficient program.
I have been trying to resolve that bug for weeks...but no success....i have tried to put some wait time between each block....result is not much different...
I have also tried putting "clear" block before and after the "write" block.....same problem.....
I have heard that the serial GPIB "flush" block may help...but i tried..but it seems the controller doesnt recognize/accept flush....
i have also tried using the "Visa open" and "Visa close" block to see if ithat reduces the stucking thing....but seems that the controller can still get stuck....
i have also even tried using "lock asyn" and "unlock asyn" block...but didnt seem to work....
Has anyone experienced such problem.? Is it a known problem with some gpib instrument?
Is there any discrepancy or bugs in my program that i am unaware of that causes this problem?
Any advice and or opinion would be greatly appreciated....
PS: i attached the controller part of my program and the overall program
desperate happyguy......
Happy guy
~ currently final year undergraduate in Electrical Engr. Graduating soon! Yes!
~ currently looking for jobs : any position related to engineering, labview, programming, tech support would be great.
~ humber learner of LabVIEW lvl: beginner-intermediate
Attachments:
HD201_Controld.jpg ‏231 KB
AChamber_Measurements_v1d.jpg ‏857 KB
AChamber_Measurements_v1d3.jpg ‏463 KB

hi xseadog
i got what you meant about the gpib reference
actually, that final frame works because the gpib reference is already done inside that subvi.
but my problem doesnt arise from that. most of the time ive seen, it arises between the writing frame and the while loop frame. as i mentionned, sometimes. the controller just simply doesnt rotate even i can see the requested position display on the controller lcd screen; also sometimes, just the controller is stuck without acknowledging the write position command. but in labview...while in debug mode. it is shown ok on the block.
Happy guy
~ currently final year undergraduate in Electrical Engr. Graduating soon! Yes!
~ currently looking for jobs : any position related to engineering, labview, programming, tech support would be great.
~ humber learner of LabVIEW lvl: beginner-intermediate
Attachments:
HD-201 RPosd.jpg ‏39 KB

CPU usage is 98% when running my exe labview program

Hi
I have made an executable and installer for my labview program. When I install and run, the program uses a lot of cpu - almost 100%, even when the program is not computing. I recently changed over to LVIEW 8.2 from LVIEW 7.1. I had none of these issues with 7.1.
Programatically, I use a state machine to continuously execute the program. I also use a couple of while loops as slaves to plot the results processed in the main loop. In all while loops I have a 'Wait' until next ms' vi to prevent the program using all the cpu, but it doesnt seem to be helping in LVIEW 8.2. This is somewhat strange.
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Cheers
RVR

It will be impossible to really troubleshoot this without a lot of additional infomation.
Is the CPU usage only high in the built application, or is it also high if you run the same program in the 8.2 development environment?
Was the 7.1 program exactly the same, or did you make any modifications since?
Are you running 8.20 or did you upgrade to 8.2.1?
What does the program actually do? Does it interact with DAQ hardware? File I/O?
What does the program do when it is "computing"? Is the CPU use even higher then?
Is there also a wait statement in the main while loop?
What is your OS (windows, linux, mac, etc.)
Is your computer reasonable for the task. Enough RAM, etc.
How do the various loops communicate with each other? (queues, local-, global-, shared- variables, etc.)
How much data is exchanged between the loops? At what rate?
Do you use fixed or variable size arrays?
Can you give us a more detailed overview of the code?
How is the memory usage?
have you done any profiling?
LabVIEW Champion . Do more with less code and in less time .

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"

Controlling stages- labview program enough?

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