Standalone application for data acquisition using NI DAQ card

I have made a standalone application in labview GUI for data acquisition and signal processing. if i have to run this application in any other computer what all softwares should be installed other than labview runtime engine...NI DEVICE DRIVER CD alone is to be installed or do i have to install any other software for data acquisition using NI daq card??
thanks and regards
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You should only need the run time engine, The device drivers for the device, maybe need VISA drivers if you are doing serial or something of that nature, You may need the channels or tasks created in NI measurements and automation if you created them there.
There may be other things that you will need depending on what you include in your code and what tool kits that you have installed.
Tim
Johnson Controls
Holland Michigan

Similar Messages

Timing for Data Acquisition Using Notifiers

I'm trying to use notifiers to transfer data from an acquisition (master) loop to the slave loop. I want data to be transferred for analysis only when the VI is in a certain state - not in all states. That's why I'm preferring to use notifiers instead of queues (I want all data collected during the other states to be disregarded). I have attached a simplified version of what I'm trying.
The master loop generates a data point every second. The slave loop is in a "delay" state for 5 seconds and then in "acquire" state for 3 seconds. Given this architecture I would expect no data for 5 seconds and then 3 data points to be plotted during "acquire" state because only one data point is generated per second. But for some reason I get 5 or 6 data points during every acquire cycle. I haven't figured out why I get 5-6 data points instead of 3. It probably has to do with the timing functions I'm using.
Thanks!
-Arnie
Attachments:
Notifier Data Transfer Template.vi ‏62 KB

Here is an example of a race condition without the use of local or global variables. What is happening is that the notifier is already queued up with a value even before the Elapsed Timer has even started. So one extra value will be in the output array. Also, depending on how the parallel loops perform (which goes first), there may be an extra value queued up before the Time Elapsed event could fire. Typically, when I ran it, I got an array size of 6 at first, and then it went down to 5. Clearly the architecture is not right for what you want to do. Instead of depending on timers and parallel loop timing, you could receive all the values queued and just discard the ones you don't want.
- tbob
Inventor of the WORM Global

Labview example for data capture using 5102 scope card

How can I program a Labview Vi to control, and capture a waveform using the 5102 scope card. I need to be able to set it up to continually capture a waveform (Channel 1 and Channel 2) when triggered on a rising edge of channel 1 and then store the data on disk automatically, then wait for the next trigger.
Any help or tips as to how I could do it would be helpful.
Thanks
Allan

Allan,
Please find the attached zip file that has some useful LabVIEW examples with scope 5102
Zvezdana S.
National Instruments
Attachments:
scope.zip ‏181 KB

How to set up FSCM 9.0 Application for Customers to use ?

Folks,
Hello. I have just installed FSCM 9.0 ( all of its modules) and run the application in Browser successfully. The Database is a clean System Database without any Demo data (Production Database).
In order for Customers to type in their data into the application, we need to set up CharFiled, SpeedType, SetID, common data in Controls Tables in the Database. In Menu, there is "Setup Financial/Supply Chain", and under PeopleTools, there is "Setup Manager". But I don't understand where to start to set up the application FSCM 9.0 application.
Do any folks understand the procedure to set up FSCM 9.0 application for Customers to use step by step ?
Thanks.

Folks,
Hello. Thanks a lot for replying.
I have installed FSCM 9.0 all of 50 modules. I just want to implement General Ledger module. Thus, I create a project named "General Ledger" in Setup Manager under PeopleTools as follows:
PeopleTools -> Setup Manager -> Manage Implementation Project -> Create New Project by Product -> select "General Ledger" ->View Summary -> Save -> Type in "General Ledger" in Project Name Box -> Click ok -> click "generate setup tasks" -> click "setup task generation status"
It has been for a long time, I still see "Run Status" is always "Queued". The button "View Setup Task" does not become clear. This means the process is not completed.
Do we need to configure Process Scheduler at first before run Setup Manager ? If yes, how to configure Process Scheduler for Setup Manager to generate a list of setup tasks of a project ?
Thanks.

Multiple Sound Card for data acquisition gives read buffer error

I am using 6 usb based sound cards for voltages and currents mearuments of a three phase delta system.. Hardware is working well. but in labview when i use builtin Input=>sound box for data acquisition it also works well upto 4 inputs... but when i use more i.e. 6 it starts giving error "cannt perform action, read buffer is full" some thing like this... som times it goes to "not responding"...i have tried to find the solution and found in another post of this fourm to varry the sampling rate... i did it upto 96000 that is maximum ... but still problem is same...i need to know, how to manually increase the read buffer. if not possible then.. is there any way that labview stop giving any type of error during simulation?

thnx i hv solved that problem ... now there is another problem... i am getting all my signals in computer but problem comes when i use phase detector. it keep on showing different values in phase measurement block.. how can i manage the signal with correct phase. i cannt send code cz it has many VIs and they are spread in computer. so i am pasting come photos that are showing different. look in picture...it is from same signal and the phase is different..
Attachments:
Capturexcvxccxvxcvcxvvxcvxcv.JPG ‏11 KB
Capturexcvxcvxcvxcv.JPG ‏11 KB

How do I use two DAQ cards in one Labview code? Current I'm getting error " error 200558 occurred at DAQmx Create Channel.vi. One task cann't contain multiple independent devices". Can someone help me?

The two DAQ cards are NI PCI-6070E & NI PCI-6052E. The Labview I'm using is labview 7 Express and the Window system is Window XP. I'm using NI SCXI-1000 chasis and SCXI-1102 & 1102B two modules plus a feedthrough SCXI-1180. 1102 is connected through SCXI-1349 cable to DAQ card 6052E while 1102B is connected through SCXI-1349 cable to DAQ card 6070E. SCXI-1180 is connected to 6070E through SCXI-1349 adaptor on the back of 1102B.

Sarah, thank you for replying my question. It seems that I'm making progress everyday (smile). I'm able to run the test using both daq cards in my code now. But as I'm moving forward, I'm getting new questions too. How do I use one STOP button to control both tasks and how can I save data into one single file?
I attached my code here hoping you can get the specifics on my application by looking at the code. Thanks very much!
Thanks.
Attachments:
DAQmx_Task_Example_plus_voltage_2.vi ‏416 KB

How can I control a stepper motor drive using a DAQ card?

I need to control a simple CW/CCW stepper motor drive using a DAQ
card. I simply need to output a 5 volt signal and then a drop in
the signal, and so on 200 times or steps for 1 revolution. I have
desiigned the basic program, but do not know how to output the
appropriate signal.
Cheers,
Matt

What DAQ card do you have? Ideally, one with a counter output to generate the steps, where you can control frequency. If you try to start the motor too fast (acceleration or abrupt application of fast pulses) it may stall out. Search in Help/Search for Examples for 'frequency' and 'pulse' for example of frequency generation. You can also use a digital output on the DAQ card to control direction.
If DAQ card does not have a counter, you coul do a software timed loop to toggle a digital output to generate the pulse train. It may not be fast enough nor accurate for your application, do not know from info you have given
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HT5100 How do I sign up for Itunes without using a credit card?

How do I sign up for Itunes without using a credit card?

Take a look here:
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Read the steps carefully as the order in which you follow them is critical. Note that you can do this only when creating a new Apple ID. You cannot use an existing ID.
You will of course not be able to get anything other than the free apps, iTunes U content or podcasts without entering in some sort of payment method (credit card, prepaid iTunes card, gift certificate, etc.)
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Data Acquisition - using local variables to write data to a file

Hello,
I am running a Data Acquisition vi (currently in LabVIEW 7.1 but soon to be updated to 8.2) that collects ~100 parameters of data from several sources contained in a while loop. The current configuration (which I did not write) uses very few subVIs and writes to ~100 local variables to store each parameter. It then reads all the local variables and builds an array of all the strings, converts then to a spreadsheet string, then uses the write characters to file function to append to a datafile. I am trying to clean things up and have came up with subVIs to collect the data from the following sources:
8 serial port sources collecting btwn 8 and 20 parameters each
~15 thermocouple readings
~10 analog inputs
~20 parameters read off an ARINC 429 bus.
I have come up with a subVI to read each of the sources and have placed the subVIs in the while loop. Each subVI outputs the data that it collects in array or cluster form. I was wondering how best to write each parameter to a CSV file at between 1 and 10 Hz. Should I write each subVI output to a LV and then read them off as was done before (the difference being that I have reduced the # of LVs to ~10 vs >100?
I should add that precise timing is not that important, so if all the subVIs are not collecting simultaneously (which I understand that they won't be), it does not really matter.
Thanks.

Hi jilla,
jilla wrote:
What I think that you are saying is to turn the outputs of the 4 subVIs into inputs of a 5th subVI that writes to the data file. Correct?
Yes. It may sound like a fine-point, but I beileve it's better to create a VI specifically for formatting data - in your example, 4 arrays IN, a single string OUT. Then write the string to file as a seperate operation. GUI-displayed data can go through a similar transformation, the four arrays wired to a subVI which builds output-structures specifically for display. It's a beginner's mistake to put lots of individual controls and indicators on the screen when groups of them are naturally related (in an object-oriented sense.) Use clusters to group related controls - this will keep the diagram much cleaner.
One more question: at what point (either # of data points or frequency of data collection) does it become necessary to use queues? Thanks.
Well, there's not really a clearly definable "point". I'd say if your update-rate climbs above 100Hz, or you witness poor program or system performance, then it's time. The scenario you've described is a fairly simple acquire/display&log loop - and simple is good. Then-again people can't see/react-to updates faster than about 10Hz - so it doesn't make sense to sacrifice performance - if performance becomes an issue.
Re: queues: Queues are sometimes used to buffer data that's "produced" in one place and "consumed" in another.
Here, if/when logging data, you're logging with every DAQ. I wouldn't recommend using a queue to transport data from a "DAQ loop" to a "Logging-loop" - those functions can be in the same loop. Should/could a queue be used to get data from a "DAQ loop" to update the GUI at a lower frequency? Sure, but a Notifier might be a better choice. Further, in the (simple?) program you've described, you might use a case structure (True/False) to only update FP indicators every "X" iterations - a simple solution that doesn't require Queues or Notifiers.
Cheers!
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)

Continuous data acquisition using NiDAQmx with a start and a stop trigger

I'm sorry if this has been answered many times before, I can't quite seem to find the answer I'm looking for.
I am using LabWindows CVI version 7 and NiDAQmx with a PCI6023E.
I wish to acquire data continuously using an external clock as a timebase - I am happy with this.
I wish the acquisition to start when an external signal (say on PFI7) goes high. I am also happy with this.
What I also need is for the acquisition to stop when the signal on PFI7 goes low, or possibly when a signal on say PFI8 goes high. I'm not too concerned about which approach to use.
How do I stop the acquisition with an external signal?
Thanks in advance,
Crispie

I don't have CVI installed, but I've attached screen shots of a LabVIEW program that I believe accomplishes what you are trying to do. Translating it to the C API should be straight forward. I'll try to explain what the program is doing since it's using some of the more advanced features of the driver. Also, the DAQ device you are using doesn't support a true "stop" trigger so I'm using a reference trigger to get as close to the desired functionality as possible.
First, the program configures a finite acquisition that uses both a start trigger and a reference trigger. The acquisition is using an external sample clock and will acquire 4 samples (2 pre-trigger samples and 2 post-trigger samples). Four may seem like an odd number here, but it allows us to emulate the functionality of a stop trigger as close as possible. Given this configuration, you must acquire at least 2 samples before the "stop" trigger is recognized, and you must acquire 2 more samples after the "stop" trigger is recognized. Hopefully this restriction is acceptable. You can always discard the last two data points after the stop trigger if they're not of interest, but you're stuck always acquiring at least two points between when the start and stop triggers are recognized.
The program also overrides the default buffer size and read position. By default, the DAQmx driver will pick a buffer size exactly big enough to fit the pre-trigger and post-trigger data (4 samples in this case) and will begin reading data from the start of the pre-trigger data. Explicitly allocating a larger buffer will allow your acquisition to execute without receiving buffer overflow errors, and changing the default read position will allow you to read all of the data between the start and stop triggers as it is acquired and not just the pre-trigger and post-trigger data.
Finally, the while loop takes care of reading the data. In this case, the loop continues to read data until the task is done and there are no longer samples available for reading from the buffer. The number of samples read per iteration is the lesser of the user specified amount or the number of samples available for reading from the buffer.
I hope this helps. Good luck.
Attachments:
Stop_Trigger1.JPG ‏40 KB
Stop_Trigger2.JPG ‏43 KB

MultiThread for data acquisition (basic problem)

Hi there,
I want to create a data acquisition VI that perform acquiring data in an independant thread, and when the data is ready, displaying it in a graph. In another word, one thread for acquisition and another one for UI events (button to start / stop acquisition, display cursor...). Data acquisition is higher priority than displaying data. Any VI concrete sample for multithread ?? Thanks in advance.

> Hi there,
> I want to create a data acquisition VI that perform acquiring data in
> an independant thread, and when the data is ready, displaying it in a
> graph. In another word, one thread for acquisition and another one for
> UI events (button to start / stop acquisition, display cursor...).
> Data acquisition is higher priority than displaying data. Any VI
> concrete sample for multithread ?? Thanks in advance.
By default, the UI runs in the UI thread. The execution of the VI runs
in the Standard execution system, which has its own thread. By default,
these threads are at the same priority. If you want your DAQ to run at
a higher priority, you can place your DAQ code in a subVI. Then set the
subVI to run in any execution system you like at a higher
priority.
Call the subVI in parallel with the rest of your UI loop, and determine
how you want the DAQ data to get to the UI. You can use a global, a
queue, etc. Don't overlook simply using the terminal or local for the
graph. All of these other methods have their advantages, but they also
add overhead. At some point, you will need to copy the data from the
DAQ code to the UI code. This is all that writing to a terminal or
local does as long as synchronous display is not turned on.
Greg McKaskle

Choice of design pattern for data acquisition system

Hello all
I have a trouble about selecting the suitable design pattern / architecture for a data acquisition system.
Here is the details of the desired system:
There is data acquisition hardware and I need to use it by observing parameters on User interface.
the data acquisiton period, channel list to scan should be chosen on User interface. Besides, there are many user interface interactions. e.g. if user selects a channel to add scanlist, then I need to enable and make visible some other parts on user interface.
When user completes the channel selection, then he will press the button to start data acquisition. Then I also need to show the scanned values on a graph in real time and log them in txt file.
I know that I cannot use producer consumer pattern here. because the data acquisition loop should wait for parameters to scan channels. and it works in a given period by user. so the user interface loop performs higher rate then consumer loop (data acquisition loop). it means queue will be bigger bigger. if I use notifier it will loss some data come from user interface.
is there any idea about that ? is there any suitable design pattern for this case ?
Thanks in advance
best regards
Veli BAYAR
Embedded Systems Software and Hardware Engineer
"You live in a graphical world. Why not program in one?"
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johnsold wrote:
Veli,
I recommend the Producer/Consumer model with some modifications.
You might need three loops. I cannot tell for sure from your brief description.
The User Interface loop responds to the user inputs for configuration and start/stop of acquisition. The parameters and commands are passed to the Data Acquisition loop via a queue. In this loop is a state machine which has Idle, Configuration, Acquisition, and Shutdown states (and perhaps others). The data is sent to the Processing loop via a different queue. The Processing loop performs any data processing, displays the data to the user, and saves it to file. A notifier can be used to send the Stop or shutdown command from the User Interface loop to the other loops. If the amount of processing is minimal and the file write times are not too long, the Processing loop functions might be able to occur in the Timeout case of the UI loop Event structure. This simplifies things somewhat but is not as flexible when changes need to be made.
I am not sure that a Design Pattern for this exact setup exists but it is basically a combination of the Producer/Consumer (Events) and Producer/Consumer (Data) Design Patterns.
Lynn
Check out this thread: http://forums.ni.com/t5/LabVIEW/Multiple-poll-case-structures-to-event-help/td-p/2551309
There are discussions there about a 3-loop architecture that may help you.
Jeff
Jeffrey Zola

Capturing data instantaneously after condition is met using 2 DAQ cards

Hi all,
I am wanting to sample a pulse and a sine wave at a low frequency of 1 kHz point by point sampling and upon a condition being met - the leading edge of the pulse being greater than a certain value - I the want to take a certain number (here 270) of samples of the sine wave at 50 kHz, multiple samples. I am doing this within a case structure and using a separate DAQ card.
The problem is that when the conditon is met is does not capture the data at the higher frequency straight away. It misses part of the sine wave before commencing capturing the 'window' of the 270 samples of the sine wave at 50 kHz. I want to know if there is any way of speeding this up? I am aware that using an FPGA could help but I don't have access to one.
The other solution would to advance the condition, i.e advance the pulse train by a certain amount so that I compensate for the delay in activating the high freq capture. I would need to set up this advance of the pulse train so that, after the delay in activation, it captures the data exactly where it is required to. What would be the best way to do this? I could delay the pulse train by a certain number of samples/ or delay the sine wave, or I have read that you can use the sample timer/counter within the DAQ card to change the 'trigger of the pulse train'. How would I implement this?
Attached is my vi. I would be very appreciative if you could help.
Attachments:
2 DAQ cards Low and High Freq Sampling.vi ‏29 KB

I do not have DAQmx or any suitable DAQ devices so I have not tested this.
This is a start on cleaning and speeding things up. Note that writing to the front panel indicators at 1 kHz will not work because the screen update rate is on the order of 50-100 Hz. Also charts take a considerable amount of computation beacuse they need to (1) store data in the internal buffer, (2) erase old data if the buffer is full, and (3) (slowest) recalculate all the pixels in the display for the updated data. The cart should be moved to the parallel loop. The condition True boolean will only be true for about 5 ms out of each 100. Look at the 5 ms boolean.vi attached. It runs close to 1 ms per iteration. The boolean is true about 5% of the time but I never see it change. Remove that boolean from your VI.
With continuous sampling on the pulse channel and reading 1 sample every millisecond (assuming you get that fast) when the high speed sampling occurs it takes 5.4 ms to acquire the 270 high speed samples. So, ten times per second the loop takes >= 6.4 ms for an iteration. The next sample it reads from the pulse channel is the one which was measured (acquired) at 1 ms after the previous sample. Thus, this data point is read ~5.4 ms after it actually occurred. The next time you detect a pulse, it will be 5.4 ms late. The second one will be 10.8 ms late. Eventually you will get a buffer overflow, but your data will be useless long before the error occurs.
The Dual Sampler Simulator.vi shows a possible approach to the issue. It simulates sampling both channels at high speed. I generate both a sine wave and a square wave and sample both at 50 kHz. It simulates reading 4000 samples at a time (equivalent to reading 12.5 times per second or every 80 ms). The square samples are then processed for the transition using the boolean Implies function. I do not recall whether the Conditional terminal was available in LV2012. I did not get an error when saving for previous version so I think it will be OK. The same thing can be done with a while loop with some extra logic. This does not handle the case where the transition occurs at the boundaries of the 4000 sample segment. To handle those cases use a shift register on the outer loop to pass the needed samples to the next iteration. The 800 ms Wait makes it run slower than "real" time but allows you to see what is happening.
Lynn
Attachments:
2 DAQ cards Low and High Freq Sampling.2.vi ‏26 KB
5 ms boolean.vi ‏10 KB
Dual sampler simulator.vi ‏15 KB

I am doing data acquisition using the 6024E board, how can I acquire voltages greater than 10V

I am doing data acquisition on MATLAB using the 6024E board, the maximun range I can see is <-10V,-10V>, can I increase this limit to be able to acquire higher voltages

Without knowing the details of the signal you are acquiring (output Z etc), I can only offer an old suggestion.
A voltage divider may be usefull. This will work if your application can tolerate some external resistors.
Ask if you want details.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How to writing the data into the file at the same frequency of data acquisition using myRIO

Hi everyone,
I have a question regarding data acquisition fequency and data recording frequency of myRIO. Hope you guys can help me out.
Basically, I want to acquire voltage input at analog input 0 at the frequency of 1kHz and then write the data into a file (tdms format).
However, I always found there were only 55 or 56 data points recorded every second in the data file (see the excel sheet).
To confirm my data acquisition was performed at the correct frequency, I added a small function in the main loop to indicate the time spent between two acquisition events.
To my surprise, the period of data acquistion is correct (1ms or 1kHz) but there are only 55 or 56 data point per second recorded in the data file.
How can I record every data point acquired by the analog input?
Thank you!
P.S. I am very new to myRIO. How can I manually set the system time for myRIO? The default time of my myRIO is wrong.
Best,
Tengyang
Attachments:
test result.xlsx ‏16 KB
Main with timed loop.vi ‏122 KB
test result.xlsx ‏16 KB

Have a look at the Jakarta POI project, they have a Java API for creating Word documents.
http://jakarta.apache.org/poi/hwpf/index.html

Standalone application for data acquisition using NI DAQ card

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