Long term discontinuous logging DAQ-assistant

Hello,
I need to log information of load cells (NI9219) and strain gauges (NI9237) with a compactDAQ 9178. This logging will be discontinous. Let's say 10 minutes logging and 50 minutes nothing (repeating). The logging has to be triggered by a digital edge. The digital signal is continious and when it falls the logging has to stop. I thought of using a while loop with a case structure within. The case structure has 2 cases with one for logging and the other one doing nothing (state machine). So the first case must be activated by the trigger signal. But how do you do this? I know the basics of labview but I never worked with DAQ-assistant before...
If anyone could help, I'll appreciate it very much
Thank you

Remember that a stop button is just a boolean, same as a digital line. Look at the little example I attached. It's VERY basic to show you the concepts. I would add more timing control, a "quit" state to close your file and DAQ, an event structure to allow on-the-fly changes, etc. but this should get you started.
It's in 2013, let me know if you need it back-saved but I'm about to head home...
Using LabVIEW: 7.1.1, 8.5.1 & 2013
Attachments:
LittleLogger.vi ‏11 KB

Similar Messages

I'm trying to set up a DAQ assist just to measure some voltage, how do i get the graph to start from 0 (time) every time I press run

Hi all,
I am trying to set up a simple DAQ assist to measure some voltages (currently a 9 volt battery to aid set up), when choosing to use a waveform chart to log the voltages the graph doesnt start from 0 (time seconds) how do I do this and get it to reset every time I press run or even stop.
What I want to see at the end is a chart for the full lenght of the test showing voltage against time in seconds.
Any ideas peeps
many thanks
Shane

Hi Shane,
Look at this VI
Here, I clear the chart before running the VI, using a 'history data' property node ( i pass an empty array to clear it)
In effect, each time you run the VI, the chart will begin at 0:00
Hope this helps
Regards
Dev
Attachments:
chart_start.vi ‏20 KB

Long term: Mountain Lion or Snow Leopard

Hi,
Had to have new hard drive installed a few days ago. System was "upgraded" to Mountain Lion. I had a backup from TimeMachine but for whatever reason, when configuring hard drive it would not see my external hard drive so I had to restore applications manually (read one by one) after "blank canvas" configuration. Now I find out all my powerpc-based applications wont work because Apple has not renewed licensing for Rosetta (info gathered from Communities). My powerpc applications are Adobe Photoshop and Illustrator, Microsoft Office 2011, turboCad, etc.
I found out I have two options:
1) Erase hard drive and Restore from TimeMachine to previous hard drive contents from 10 days ago, which run on Snow Leopard (which I had downloaded, so no disks). Will this work?
2) Install Parallels 7 or VM firmware, and somehow install Snow Leopard there and run my powerpc applications from there. How to do this I have no idea...
Long term:
If Apple will never restore Rosetta or powerpc capabilities, should I go with option 2 and get on with the "new world"? I'm not too technically savvy and not sure how I can do this on my own... so would need to go see the Geniuses for this, I guess... But I'm not sure what the advantages of Mountain Lion are! So far, I dont see much, and I am not sure I would know how to maintain a "Parallel PC universe" without doubling everything.
Since I'm not sure of any advantages to Mountain Lion, I should maybe go back to my Snow Leopard version, then? but I am not sure how, exactly, without loosing everything once more.
Of course, if someone knows there are powerpc capabilities for Mountain Lion in the future, then I am all set, right? Does anyone know how Apple or Microsoft plan to "help" us poor souls who choose Mountain Lion without being aware of these issues?
(note: I have moved three times in the past two years and cannot get my hands on my iWorks CDs or my Microsoft Office 2011 CDs)
Any recommendations?

Dropping Rosetta was a technical decision. As stated, Apple has traditionally only supported it's current and last OS versions.
There are tons of advantages to updating to Mountain Lion, assuming your hardware supports it. Look HERE for details and HERE for hardware compatibility and instructions on how to upgrade properly.
Alansky is correct that this is not new news as well. He also is correct in saying that Rosetta will never again be supported. If I remember correctly, the last PowerPC version of Photoshop is CS2 released in 2005. That's 7 years and 4 major releases ago. Sorry to say, but it is time to bit the bullet, move to Mountain Lion and update your legacy software.
I am using Microsoft Office for Mac 2011 and it runs fine on Mountain Lion 10.8.
You can certainly install and run Snow Leopard in a Parallels partition but I don't recommend it. Take a look HERE for details.
Not having your Office install disks sounds suspicious but we'll assume that you have a legal copy. In that case, you should be abe to contact Microsoft HERE for assistance in retrieving your product key and getting a download link.

Struggling how to set up 2 daq assist on labview in the same VI

hi all,
hope someone can help me out
I am currently using the scxi 2345 with some SCC FT01 feed through modules, these are just to record some voltages from some transducers.
What I am struggling with is setting up 2 daq assist on a single VI, it is coming back with a error stating specified resouce is reserved and then a window saying learn more about automatic handling. How would I also have these 2 values logged on the same graph or chart?
Anyone any ideas how to set these up.
I ideally want to have 3 daq assist in the same Vi but not sure if this is possible. It would be 1 for thermocouple input and 2 for voltage as stated above
many thanks
shane dover

Hi Shane and Dennis,
I've been working my way around the same type of problems, and I am
currently re-writing everything to use on Asst. per board on my PXI
chassis, so that no resources become reserved.
As a result, I have to separate the signals on the output dynamic data
in order to do different post processing. So I have been toying
with staying with dynamic data, inputting dyn. data into an array, and
inputing it into a cluster. It seems that each has advantages and
drawbacks, but arrays seem to be the easiest with which to work when
splitting signals coming from a DAQmx Asst. and funneling some of the
signals into a post-processing sub-VI. The drawback to this is
that time stamps in the Dyn. Data are lost if you want to record the
data and the time of the reading.
Question: Is there an easy way to pipe Dynamic Data into a
calculation subVI? Is it workable after it's been split from
other streams?
Thanks,
Brad

Why can I only open DAQ assistant properties using the windiws profile I registered labview on?

I have Labview 7.1 installed on Windows 2000. When generating block diagrams for codes, the properties dialog box for the daq assistant can only be opened when logged into our system on the profile originally used to install the software or when logged in as administrator. All other properties dialog boxes open under any user profile.

I do not use Windows 2000, but I expect that the folder in which this function is held does not have a 'Full Control' access setting for all users.
See if you can change the folder profile to allow access and full control to all users.
Hope this helps.

Labview ignores all but 1 Daq Assistant, how can I avoid this?

When I am putting together my block diagram, I use the DAQ Assistant to orchestrate everything. Then when I go to create another DAQ Assistant instance, LabVIEW seems to ignore the first one. It appears as though I can only use one DAQ Assistant at a time in my VIs, is this the case? I am a bit of a novice, is there an easy way to avoid this, or change the orginal DAQ Assistant into some other form so I can use another DAQ Assistant for developing another part of my VI?
I have looked long and hard for a good explanation of the difference between Tasks and Virtual Channels and while I have found efforts at explaining it, I do not understand. I see that I can convert my DAQ Assistant into a task, but then I have a task output which does not help me (I need a data output for my VI).
I am sure this is obvious to someone that has done it a million times, but I just can't find an answer wading through all of the knowledge base information or the LabVIEW help.
Thanks a bunch!
~milqman

Hello milq,
That following tutorial that Novatron linked you earlier is an awesome resource for becoming familiar with programming with the NI-DAQmx.
Learn 10 Functions in NI-DAQmx and Solve 80% of Data Acquisition Applications
An important point to take away from this tutorial is that you can either create a DAQmx task using the wizard-style interfaces provided by the DAQ Assistant and within Measurement & Automation Explorer (MAX), or you can programmatically create and configure your DAQ Task in your LabVIEW code using the DAQmx Create Virtual Channel VI, DAQmx Timing VI, etc. When you create a new DAQmx Task using the wizard-style interface, you are configuring all of the settings for your task manually. When you use that DAQmx Task in LabVIEW (with a DAQmx Task Control or Constant), you are referencing all of those configuration options you've manually set. To actually perform a read or write operation based on those settings, you need to wire the DAQmx Task into the 'task in' input of a DAQmx Read or DAQmx Write VI.
So for your analog input operation, you can wire the task directly into a DAQmx Read VI. In the DAQmx Read VI, you'll want to select the type of task your reading from in the drop down box (Analog), if your reading from a single or multiple channels (1 Chan or N Chan), and if taking just one or multiple measurements with each call to the DAQmx Read VI (1 Samp or N Samp)
For your digital output operation, you'll want to configure a separate digital output task, and wire it directly to a DAQmx Write VI. Again, select the type of task your writing to (Digital), if your writing to a single or multiple channels, and if you want to perform a single write or multiple writes.
To help with getting started with DAQmx programming in LabVIEW, I would highly recommend taking a look at the DAQmx example located in the LabVIEW Example Finder (Help > Find Examples). A difference you'll note in these examples is that all the task configurations that you have been making with the wizard-style DAQ Assistant are done programmatically with the DAQmx Create Channel and DAQmx Timing VI. I hope this helps and good luck!
Travis G.
Applications Engineering
National Instruments
www.ni.com/support
Message Edited by Travis G. on 06-21-2006 05:23 PM
Attachments:
AnalogInDigitalOut.Jpg ‏21 KB

DAQ Assistant doesn't start under normal user previlege

I just installed LabVIEW 7.1 and DAQmx 7.3. I found that the DAQ assistant did not start (the wizard window did not show up) under normal user previlege. However, if I change the user previlege to administrator, it works fine. Any idea what is happening and how to fix it.

Hello,
Thank you for contacting National Instruments.
This problem is caused by a lack of permissions. The DAQ Assistant is built from Measurement & Automation Explorer (MAX), and the user needs permission to access MAX's files.
Complete the following steps to set up permissions for the MAX Directory:
Log onto the computer as an administrator
Browse to the C:\Program Files\National Instruments\MAX directory
Right-click the MAX folder and select Properties
Click the Security tab, and click the Add button
Type in the user name and click OK
Give the user Read & Execute, List Folder Contents, and Read permission
Click Apply and then OK
If you have several different users and want all users to use the DAQ Assistant, repeat the above steps but type everyone for the user name. The above steps are written for Windows XP with a NTFS file system. For previous Windows versions, the procedure will be very similar but may not be exactly the same.
This problem will be fixed in NI-DAQ 7.4.
Sean C.
Applications Engineer
National Instruments

Error with 2 Daq assistant

Hello
Another noob joining the community. Here is my question.
What am i doing wrong? I use 2 Daq assistants on the NI9401 module this is for digital input and output. I use it for generating 2 signals. If i test it with 1 it works but if i go to 2 or more it fails. This is the error i get . I have also added the program as an attachment.
Thanks in advance.
Solved!
Go to Solution.

Hello,
That error means that the DIO task is reserved and cannot be obtained by one of the DAQ assistants. There is actually a nice example program on what you want to do. It can be found here:
https://decibel.ni.com/content/docs/DOC-11632
This example does not use the DAQ Assistasnt but the DAQmx API VIs (which the DAQ Assistant is using also anyway). If the order is not important (and since the these DIO tasks are software timed it is probably not an issue you can also choose to use the error cluster from one DAQ assistant and wire it to the other (see attached VI). Doing it that way you force one DAQ task to wait for the other one to finish. In that way they cannot run at the same time preventing for the error to happen.
regards,
Rik Prins, CLD
Applications Engineering Specialist Northern Europe, National Instruments
Please tip your answer providers with kudos.
Any attached Code is provided As Is. It has not been tested or validated as a product, for use in a deployed application or system,
or for use in hazardous environments. You assume all risks for use of the Code and use of the Code is subject
to the Sample Code License Terms which can be found at: http://ni.com/samplecodelicense
Attachments:
2 Daq assistant generating error (3).vi ‏169 KB

Can't see the "DAQ assistant express VI" in LabView7 express

i am using the LabView 7 express avaluation package, and trying to use my PCI 6132 DAQ card with it.
i cannot see the "DAQ assistant express VI" simbol in the "input" box, and therefore cannot connect to the DAQ.
all drivers are installed, and i manage to log data directly from the DAQ, using the "Measurement & Automation" software.
any ideas?
doe's the evaluation version even supports this DAQ?

GilKlar,
Did you install DAQ first, or LabVIEW? The most common cause of this problem is that DAQ support was installed before LabVIEW support. In this case, the DAQ driver will not find any valid installations of LabVIEW and thus, will not install the necessary VIs. Please try repairing the DAQ installation and making sure that support for LabVIEW is checked.
If this does not solve your problem, please let us know what version of the DAQ driver you are using, as well as how you are acquiring data in MAX.
Hope this helps,
Ryan Verret
Product Marketing Engineer
Signal Generators
National Instruments

DAQ Assist wont build

I am having issues with DAQ Assistant on Labview 2011.   I have the most up to date DAQmX drivers from the website.   Still have the issues after doing a full re-install of everything as well.
DAQ Assistant will find the channels and show the output in the top graph display area.   When you go to build the VI and click ok it just runs the "building" scanner bar and locks up completely.   It will also give the "Failed to create directory for auto recovery VIs" error message.
I had to install with ad-min rights, but cannot run under an ad-min account.   Do I need to set some kind of permission for the DAQ Assistant to work? If so, which/and how do I set those specific rights.   Any other help? Thanks in advance!

The solution was found by doing a Google search on "Run application as administrator on Windows 7", one of the found sites provided these various options: I would stay away from options 7 & 8 unless you know exactly what you are doing..
from here
OPTION ONE
"Run as administrator" using a Keyboard Shortcut
NOTE: This will allow you to temporarily run a program as an administrator once until you close it.
    1. Press and hold Ctrl+Shift while opening the program.
    2. If prompted by UAC, then click on Yes to apply permission to allow the program to run with full permission as an Administrator.
    NOTE: If you are doing this is while logged in as standard user instead of an administrator, then you will need to provide the administrator's password before the program will run as administrator.
OPTION TWO
"Run as administrator" using Context Menu of Program
NOTE: This will show you how to temporarily run a program as an administrator once until you close it.
    1. Right click on the program's shortcut or an .EXE file, BAT file, CMD file, or MSI file, and click on Run as administrator. (see screenshot below)
        Run as Administrator-context_menu.jpg
    2. If prompted by UAC, then click on Yes to apply permission to allow the program to run with full permission as an administrator.
    NOTE: If you are doing this is while logged in as standard user instead of an administrator, then you will need to provide the administrator's password before the program will run as administrator.
OPTION THREE
"Run as administrator" from Pinned Program on Taskbar
NOTE: This will show you how to temporarily run a program pinned to the taskbar as an administrator once until you close it.
    1. Right click on the icon of the pinned program on the taskbar to open it's Jump List. (see screenshot below)
    2. In the Jump List, right click on the program's name, and click on Run as administrator. (see screenshot below)
        Run as Administrator-taskbar1.jpg
    3. If prompted by UAC, then click on Yes to apply permission to allow the program to run with full permission as an Administrator.
    NOTE: If you are doing this is while logged in as standard user instead of an administrator, then you will need to provide the administrator's password before the program will run as administrator.
OPTION FOUR
"Run as administrator" from Start Menu Search Box
NOTE: This will show you how to temporarily run a program as an administrator once until you close it.
    1. Type in the file name (ex: cmd) of the program that you want to run elevated. (see screenshot below)
        Run as Administrator-start_menu.jpg
    2. Do either step 3 or 4 below.
    3. Press Ctrl+Shift+Enter to open the program (ex: cmd) elevated, and go to step 5 below.
    OR
    4. Do OPTION TWO as above to right click on the program (ex: cmd) in the search results at the top of the Start Menu, and click on Run as administrator. (see screenshot below step 1)
    5. If prompted by UAC, then click on Yes to apply permission to allow the program to run with full permission as an Administrator.
    NOTE: If you are doing this is while logged in as standard user instead of an administrator, then you will need to provide the administrator's password before the program will run as administrator.
OPTION FIVE
"Run as administrator" using Compatibility Mode
NOTE: This will show you how to always have the program run as an administrator when you open it.
    1. Right click on the program shortcut or program .exe file, then click on Properties, and on the Compatibility tab. (see screenshots below)
    NOTE: If you are doing this while logged on as a standard user instead of an administrator, then you will need to also click on the Change settings for all users button and type in the administrator's password.
        Run as Administrator-compatibility_mode1.jpgRun as Administrator-compatibility_mode2.jpg
    2. To Always Run this Program as an Administrator
        A) Check the Run this program as an administrator box, and click on OK. (see screenshots above)
    3. To Not Always Run this Program as an Administrator
        A) Uncheck the Run this program as an administrator box, and click on OK. (see screenshots below step 1)
    4. Open the program.
    5. If prompted by UAC, then click on Yes to apply permission to allow the program to run with full permission as an administrator.
    NOTE: If you are doing this is while logged in as standard user instead of an administrator, then you will need to provide the administrator's password before the program will run as administrator.
OPTION SIX
"Run as administrator" using Advanced Properties
NOTE: This will show you how to always have only this specific shortcut of the program run as an administrator when you open it, and not from any other shortcut or .exe of the program.
    1. Right click on a shortcut that you want to run as administrator, and click on Properties.
    2. Click on the Shortcut tab for a program shortcut, then cllick on the Advanced button. (see screenshot below)
        Run as Administrator-advanced_properties1a.jpg
    3. To Always Run this Specific Shortcut as an Administrator
        A) Check the Run as administrator box, and click on OK. (see screenshot below)
            Run as Administrator-advanced_properties2.jpg
    4. To Not Always Run this Specific Shortcut as an Administrator
        A) Uncheck the Run as administrator box, and click on OK. (see screenshot above)
    5. Click on OK. (see screenshot below step 2)
    6. Open the program.
    7. If prompted by UAC, then click on Yes to apply permission to allow the program to run with full permission as an Administrator.
    NOTE: If you are doing this is while logged in as standard user instead of an administrator, then you will need to provide the administrator's password before the program will run as administrator.
OPTION SEVEN
"Run as administrator" using an Elevated Shortcut
    1. For how, see:
        How to Create a Elevated Program Shortcut without a UAC Prompt
        OR
        How to Create a Elevated Program Shortcut a Standard User is able to Run in Windows 7
OPTION EIGHT
"Run as administrator" Manually in Registry Editor
    1. For how, use the RUNASADMIN value with the full path to the program's file in OPTION THREE here: How to Run a Program in Compatibility Mode in Windows 7

Fourier Transform and the DAQ Assistant

Hi,
I'm trying to take the fourier transform of a analog voltage measurement in Labview 8.6 and I'm having a problem with the data.
The measurement is an anaolog input voltage signal taken using the USB-6211 box. I am acquiring the signal on ports 15 and 16 (differential) with the DAQ Assistant at a rate of 5KHz, 200 samples. The setup works perfect thankfully, and a very nice waveform plot is generated on the VI. I would now like to add a fourier transform of this plot to do some frequency analysis.
I found the FFT function, but when I tried to add the DAQ output to it, I got an error about dynamic data. It takes me to a screen which I don't understand about dynamic data conversion, and I'm not sure what to do from this point. My FFT graph is basically just a flat white line, which is wrong.
How can I just take the basic fourier transform of a waveform in this setup?

Hi
Your thinking is not bad. You have only some scaling problems. You may toy with the vi I am sending. Change the log/linear control and see the result.
You will find all information you need here http://zone.ni.com/devzone/cda/tut/p/id/4541 and http://zone.ni.com/devzone/cda/tut/p/id/4541. The dt value is the reciprocal of the sample frequency(1/x) The unit is second, and it will give you the time interval between two samples.
Also note how I use the "Dynamic To Waveform Array.vi" to convert the dynamic data. This VI is not documented by NI, but you find it here ...vi.lib\express\express shared\transition.llb\Dynamic To Waveform Array.vi
Good luck
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)
Attachments:
Spectrum Analyzer.vi ‏32 KB

Restore Backup log file back SID .log and be*****.ant

Dear all,
I have to restore sap oracle online backup from source server to target server. We have taken the backup of source server on tape. Now we have to restore that tape backup on target server. We don't have back<SID>.log and be*****.ant with us.
How can we restore the back<SID>.log and be****.ant tape first by which we can start the restore online backup on target server or without this back<SID>.log and be****.ant can we restore the backup on other location ( which i tried but not working, it is asking for back<SID>.log file.
Thanks
Ward

Hi Ward,
As long as you have complete oracle datafiles, restore without logfiles can be done.
1. As a precauition, copy all /oracle/<SID> to a safe place during offline state (SAP down, Oracle down)
2. Replace each datafile from tape to the current datafile location. e.g /tape/sr3.data1 -> /oracle/<SID>/sapdata1/sr3_1/sr3.data1
3. Make sure that archive logs is complete from the point where you start online backup.
4. sqlplus /nolog
5. startup mount
6. You will likely found error with controlfile. Replace all oracle controlfiles from tape backup, then repeat the startup
7. recover database until cancel using backup controlfile
8. choose the archive where you want the point of restore
Good luck

DAQ Assist Continuos High Speed Display

I am using the DAQ Assist to read in voltage data and display it as a scrolling chart. When I set it to take "N Samples" it works well, but wont display that data until the N samples have been collected. When I switch it to a continuos mode and set it to take 1 sample buffer at the same rate (20kHz) it actually samples much slower. Any suggestions about how to get a continuous chart that still shows the the data at full speed?
Thanks

The DAQ assistant, while it is great for getting a quick and dirty DAQ task up and running, isn't really designed for high speed data acquisition with precise control. You will likely need to use the lower level DAQmx functions. Start a task, acquire chunks of data in a loop, end the task. You may need to pass the data off to a parallel loop for data processing, display, or logging using a producer/consumer design architecture. Take a look at the DAQmx examples in the example finder.
If you right click on your DAQ assistant and select Open Front Panel, it will turn the Express VI into a subVI that you can open and see how the underlying DAQmx code works.
It may even be a matter of selecting continuous samples in your DAQ assistant, a small number of samples to read, have it in a loop that iterates enough times until you have collected your larger number of samples.

DAQ Assistant verses DAQmx

Whats the advantages of acquiring data from the DAQmx block rather than using the DAQ assistant block? Are there pro's and con's to each? What is normally used in industry?
I've also noticed there are multiple methods for writing data to file and wondered what the proper method or pros and cons for this are?

Dawud-Beale wrote:
Whats the advantages of acquiring data from the DAQmx block rather than using the DAQ assistant block? Are there pro's and con's to each? What is normally used in industry?
You have A LOT more control over the acquisition with the DAQmx API over the DAQ Assistant. You can also make the code more efficient with the API. Normal in industry to to avoid the DAQ Assistant
The only real advantage of the DAQ Assistant is that it is easier to set up your task.
Dawud-Beale wrote:
I've also noticed there are multiple methods for writing data to file and wondered what the proper method or pros and cons for this are?
Well, that just depends on your requirements.
Need human readable? Go with a tab delimited text file or CSV.
Need to log a lot of data quickly? Use a TDMS or binary file. I tend to use the TDMS since it is well put together for DAQ and waveforms.

I am a long-term user of Lightroom as a standalone product with a perpetual licence. As a retired person on limited income, it is very disappointing to me that Adobe have introduced the 'Creative Cloud' (CC) subscription service in order for me to be able

I am a long-term user of Lightroom as a standalone product with a perpetual licence. As a retired person on limited income, it is very disappointing to me that Adobe have introduced the 'Creative Cloud' (CC) subscription service in order for me to be able to continue upgrading this excellent product. It will be for me too expensive at the minimum cost of £9 per month. The additional services that CC brings are personally of no relevance or usefulness. Adobe should be prepared to support existing users who are, like myself, non commercial, amateur photographers by giving them the simple opportunity to upgrade to Lightroom 6 as a standalone, perpetual licence product. As a member of a camera club I know my co-members who use Lightroom are equally disappointed by this move to a subscription-only service.

john beardsworth wrote:
John Waller wrote:
However, Adobe will soon introduce Cloud only features into Lightroom CC for which LR6 (perpetual license) owners will have to wait until LR7 (paid upgrade).
That is possible, John, but it is only speculation on your part. Might, not will.
kwdaves wrote:
There is a "Lightroom 6" upgrade available for US $79 if you have a valid license for any of the earlier versions. From what I can tell, the only difference between Lightroom 6 Full, Lightroom 6 Upgrade and LightroomCC is in the license. The download file is the same.
Other differences - with CC you get LrMobile/LrWeb and they throw in a free copy of Photoshop too.
Yes, but when I bought my standalone license and clicked on the "Download" button it took me to the LightroomCC page. The downloaded file is named Lightroom 6, but in the CC app the installed program is LightroomCC (2015).

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