No data output field in DAQ Assistant

I am currently trying to read temperature from my NI WSN 3202. I have a thermistor connected to AI0 and AIGND. I am following a tutorial to convert from volts to degrees F and everything has been working so far.
Once I reach the step for DAQ that is when I have issues. I've created a simulated device (following another tutorial). When I configure everything for DAQ, there is no data field so that I can wire it to my indicator and then to the formula block. Can anyone assist me with this problem?
Pictures have been included. (The picture that has the data field is what I'm trying to get to)
Thank you in advance!
Attachments:
1.PNG ‏111 KB
2.PNG ‏94 KB
3.PNG ‏326 KB

I would do as the error message tells you, reinstall DAQmx.
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How to select signals from the output of a DAQ assistant

Hi!
I am a new user of Labview 8.5 and I am working with a USB-6210. I have two different instruments connected to the same USB device, half of the channels are being used for pressure transducers where I only need to reed and save the data, while the other half are associated to TCD detectors where I need to perform some analysis to the signal to obtain and save the data. I am in the first step of building the block diagram, After I define each of the signals which its corresponding channel using the DAQ assistant, I need to select and separate the signals coming from the pressure transducers from those coming from the TCD detectors, before I can continue drawing the block diagram. I am trying to use the Select Signal function but I am not sure how to do this. Can anyone please let me know at least in which manual can I find a good explanation? I have been reading the Getting Started and the User Manual for LabView but they have not been very useful so far.
Thanks!
Solved!
Go to Solution.

Wire the Select Signals express VI to your DAQ Assistant and run the VI once (this allows the signal names to propegate). Then when you open the Select Signals configuration you'll be able to pick out the channels you want by name instead of just "Signal 1" etc.
It sounds like you'll probably want two Select Signal Express VIs, one for the TCD detectors and one for the pressure transducers. Something like this:
If you right click on the VI and select Help or click on the Help button within the configuration dialog you will bring up the LabVIEW help page for this (or any other) VI. Are you looking for some other information that isn't documented in the help file?
Hope this helps,
Simon

Getting the data in file using DAQ assistant in Labview

I am using SCXI 1000 chassis, SCXI 1125 input module and SCXI 1320
terminal.
I am using DAQ assistant in labview to obtain temperatures and store it in
a file. The experiments run the whole day and I need the whole data
generated during this time to be stored in a single file, but I am unable
to store it in a single file.
Can someone please give me some insight as to how can I achieve this?

Hi Mr,
It would be helpful to see your code to see exactly how you are acquiring the data. Are you doing continuous buffered measurements? Or are you performing single point temperature measurements in a while loop?
Either way you will want to use the "write to spreadsheet" VI in your loop. Simply wire your data into the "write to spreadsheet" vi and se the "append to file" input to TRUE. This will make the data add on to the end of the file with each iteration of the loop. The "write to spreadsheet" VI is located in the file IO pallette in LabVIEW.
Thanks,
Sal

There are no inputs or outputs on the DAQ assistant to connect to

Hi everybody,
I am new to labview and have run into some difficulties with the DAQ assistant. I am running labview v8.0, NI-DAQmx v8.7.1 and have a PCI-6224 DAQ installed. It seems that when ever I drop the DAQ assistant (the instrument assistant, and the simulated DAQ has the same issue) onto the block diagram, and configure it, there are no inputs or output which I can wire a control or indiactor to. Is there a step that I am missing somewhere?
Thanks in advance!
Solved!
Go to Solution.

Sorry, forgot to attach the end result. Note I did have errors come up, they may have been due to no DAQ cards in my PC.
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~
Attachments:
daq_test[2].vi ‏83 KB

How do you save dynamic data type, from the DAQ assistant, for use in Excel or matlab?

Currently, I have the following basic VI setup to save Data from my PCI6221 Data Aquisition Card. The problem I'm having is I keep getting the last iteration of the while loop in the measurement file and that's pretty much it. When I try to index the data leaving the loop it gives me a 2D array of Data which cannot be input into the "Write to Measurement File" VI. How would I save this to a useful Data/time step format? I was wondering of a way to continuously collect the Data and then save it in a large measurement file that I would manipulate in Matlab/excel? Am I using the wrong type of loop for this application? I also noticed my Dynamic Data array consists of data, time, timestep and then a vector of the data taken. Is it possible to just get a vector of the time change per sample alongside the data? Sorry for the barrage of questions but any help would be greatly appreciated, and thanks in advance!
-Bryan
Attachments:
basic DAQ.vi ‏120 KB

There is a VI in the Express > Signal Manipulation palette called "From DDT" that lets you convert from the Dynamic Data Type to other data types that are more compatible with operations like File I/O....for instance, you could convert your DDT into a 2D array and use the Write To Spreadsheet File.vi. Just a thought...
-D
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman

How to achieve data from more than 1 DAQ-assistant?

When running my LabVIEW program using the data coming from 2 simulation sources, no problem occurs and data is correct.
When using the data coming from 2 DAQ-assistants (real data), an error occurs, telling the following:
"ERROR 50103 occured at DAQmx Read (Analog 1D Wfm NChan NSamp).vi, reason: The specified resource is reserved. The operation could not be completed as specified"
Does anyone know what exactly is wrong and how to solve this problem?
Nowhere I found a solution for this problem and I have been trying numerous things to change in the program, but the same problem keeps occuring.
Could anyone please help me?
I need to solve this to be able to perform tests for my graduation project.
Tha
nk you very much in advance,
Yours Sincerely,
Karel Rycek

The problem is you are trying to access the AI channels at the same time. When you setup the first DAQ assistant it reserves the AI section of the board. When you then try and use the second DAQ Assistant you get the error because it is trying to access a reserved section. If you had 2 different boards this wouldn't be a problem. That is probably overkill though. What you can do is read multiple channels in the 1st DAQ assistant and then in your program split the data off if you need to do different calculations.

How to change output precision of DAQ to waveform chart and to spreadsheet

Refer vi attached, the DAQ connects to a waveform chart to a spreadsheet. I want to change the precision of the DAQ assistant output from 6 decimal places to 2 decimal places, but everywhere i searched on the DAQ assistant i cannot find a precision setting. Did i miss something? What is the elegant way to do this?
Thanks.
Message Edited by sunflower2772 on 09-08-2009 03:57 AM
Solved!
Go to Solution.
Attachments:
all-instrumentasst 5 sep header change.vi ‏220 KB

Hi sunflower,
this seems related to this question...
Why do you want to change the output of the DAQ assistent?
Shouldn't you change the precision of the spreadsheet creation? To do so you simply have to give some parameters to the "to string conversion" functions...
Apart from file saving all other display precision settings are just cosmetics of the indicators!
Message Edited by GerdW on 09-08-2009 11:07 AM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Mutiple readings from Express DAQ Assistant VI

Hello All!
First I'm a fresh noob to LabView and although I understand most of the basic concepts, I'm also new to programming in general. I'm working on a project to remotely monitor several different parameters of a system. Right now I'm working on a test program to monitor three parameters in my shop across the street. I'm using a NI USB-6008 as a DAQ device, DAQmx 8.0 and LabView 8.0. All of my input signals are 4-20 mA signals coming from my three sensing devices.
Here's my problem; I need to monitor all three signals on digital displays. I can accomplish this by using three different instances of the express DAQ assistant but then I get the dreaded "50103 error" unless I wire the stopped output of one assistant to the stop input of the next in a feedback loop and even then I get the 50103 error on the first iteration of the loop. From my research I understand that this isn't the correct way to program this. I should use one DAQ assistant with multiple channels assigned to each one of my parameters. I've did this but now how do I make each one read out on an individual digital display? I only have one output from my DAQ assistant.

Hi George,
Use split signal in the signal manipulation functions menu to get your 3 individual singals on respective indicators
Regards
Dev
Attachments:
SPLIT.vi ‏85 KB

How to properly read data from one DAQ-assistant and write simultaneously with another DAQ-assistant (which is inside a loop)

Hello.
I'm a newbie working on my Master's thesis conserning a project that is based on old G-code made by another newbie so bear with me.
I need to create a sequance of output controls. For this I'm using a for loop that eventually creates two triangular ramps during a period of 90 seconds. I've confirmed that this function works properly by measuring the actual output of the DAQ-decice (NI USB 6353).
The problem is the following: During this controll-cycle I need to simultanously collect data from the same DAQ-device. At this point there is only one DAQ-assistant output-block in the main loop of the program and all the signals are derived from it to where they are needed.There is a case-structure (the bottom case structure in the picture) that contains the functions needed to collect the data during the test cycle. However these two actions, outputting data and inputting data, are not synchronized in any way which may be the reason why I get the 200279 error or alternatively the 200284 error during the test cycle. I've tried changing the sample rate, buffer size and the timeout time as adviced but nothing seems to help.
What would be the simplest way to solve this problem?
Help is greatly appreciated!
Attachments:
problem.jpg ‏206 KB

Thanks for quick reply.
However, I did try it (see the picture) but I still have a problem: I only get 100 samples / channel during the test sequence (all from the first seconds of the sequence) in total even though I've set the data aqcuiring DAQ-assistant as "continous" and "samples to read = 95k" and rate is 1000Hz.
Edit.
And lastly, I have trouble adding this "extra" DAQ-assistant to the vi. because I get an error about a resource (The 6353) being reserved, even though I connected a false constant to the "STOP" -input of the main DAQ-assistant.
Attachments:
is_this_what_you_meant.jpg ‏212 KB

How to control a digital output signal using the DAQ assistant?

I am using a USB 6251 DAQ board and would like to control a switch. I am gathering airflow, pressure, and acoustic data on the same board (analog input) and would like the switch to trigger when the airflow value is within a pre-determined range. Finally, I would like to reverse the polarity of the switch (to off) about a second after the initial digital signal, all of which is during continuous data acquisition.
I am able to actuate the switch only when pressing the "run" button in the DAQ assistant window. I am proficient with data acquisition but have never tried programming an output... Please help!
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-a troubled researcher
P.S. I am running LabVIEW 8.5 as well.

blsmith4,
You probably won't get the control of the digital port on your card by only using the DAQ Assistant. One of the following examples should provide you the functionality that you would like out of the box:
Digital - SW - Timed Output (Simple)
Digital - Continuous Output (More Complex)
Continuous Write Digital Port - External Clock - Non Regeneration (Most Complex)
Let me know if these work better for you.
Best,
Jason M.
Applications Engineer
National Instruments

How can I link my daqmx code to another daq assistant to hear my audio output?

Hi,
I got a burning question about my school project. I need to use labview and my NI-mydaq to test the difference between
various samples rates and bit depths.
I linked an mp3 file to the AUDIO IN of my NI-mydaq and created a way to be able of switching sample rate while running my program.
Now I would like to link my program inside the NI-mydaq to my AUDIO OUT...
So... I generated daqmx code out of an input daq assistant, how can I link my daqmx code to another daq assistant to hear my audio output?

Hello Fontys_Student...,
I am not sure I properly understand your question.
You want to, first, acquire a signal from the AUDIO IN input, second, do some processing on the acquired signal and, third, generate this processed signal at the AUDIO OUT, right? What is the part causing some troubles?
If you already have the signal acquired and processed, you can simply wire this processed signal to the "data" input of a second DAQ Assistant, right?
Did you already have a look at the myDAQ User Guide (http://www.ni.com/pdf/manuals/373060e.pdf)? On page 32-35, there is an example showing what you need I suppose.
Cédric | NI Belgium

Express DAQ data output to two numerical indicators

Hi,
I'm a complete Labview newbie, so apologies if this is a really obvious question, but after reading through pages of documentation I still can't get anywhere.
I'm using a PCI 6220 data acquisition card, and want to measure 2 independant currents, outputting each value on a seperate numeric indicator.
I used the DAQ assistant, and set up the two signals without too much trouble in the box that appears when you double click the assistant. If I connect the data output on the box diagram to a graph indicator, I can see both signals fine, but I would much prefer a numeric indicator for each signal. I can connect one, and that works fine: displaying the first current measurement I defined, but I can't see any way to get the second current measurement displayed in the same manner.
All help welcome!
Thank you

I've attached a screenshot of the VI and the DAQ assistant configuration window thing - hopefully this helps explain what I mean(!)
I don't seem to be able to choose a channel for the numeric indicator?
Attachments:
VI_screenshot1.jpg ‏366 KB
daq_assist screenshot1.jpg ‏146 KB

I have a DAQ Assistant configured to read multiple channels at the same time. When I wire a graph indicator to the output, I see all of my signals jumbled together. How do I split them up into seperate signals?

I have a DAQ Assistant configured to read 2 channels at the same
time. When I wire a graph indicator to the output, I see the 2
signals jumbled together. How do I split them up into seperate signals?
When I wire any type of indicator it is showing just one output of a single channel.
I want 2 indicators showing 2 different signals as expected from the 2 channels configured. How to do this?
I have tried using split signal but it end up showing only 1 output from 1 signal in both the indicators.
thanks in advance.
Solved!
Go to Solution.

Yes you are right. I tried that but I did not get the result.
I just found the way. When we launch split signal, we should expand it (split signal icon) from above and not from below. It took me a while to figure out this.
thanks

How do I use DAQ Assistant to output DC on an AO?

My background includes 15 years of programming PLC's. AO's were simple. You passed the AO a value between preset ranges and it output a proportional voltage signal based on the hardware capabilities.
I foolishly thought LabView and DAQ AO's would be about the same. I built a vi to generate a DC signal which I could control the amplitude of. I also tied it to a chart to monitor how it worked. I managed to draw some very pretty ramping pictures on my chart, but when I put a DMM across the physical terminals I see no voltage.
Then I used MAX to test the channel and measured it again. Now I see voltage on my DMM. I was attempting to use the DAQ Assistant to do this. Do I need to force it to re-read the changing value I am sending it? All of the examples I find show me more primitive methods, and I could not seem to get any of them to do what I want either. I need to send a speed reference to a DC drive.
My incorrect method was to recursively add a value for ramping the signal up or subtract to ramp down. This method works perfectly on an industrial PLC. I connected a chart to the signal just as it entered the DAQ Assistant, but the only way I could check the actual was with the DMM.
Are there any examples that use the Assistant? If not then I guess I will have figure out how to use the primitives anyway.
technomage

Hello technomage,
It looks like we have discussed this problem in another thread (found here). If you have any other questions about it, please post there.
Regards,
Jesse O.
Applications Engineering
National Instruments
Jesse O. | National Instruments R&D

Dynamically passing data into a running while loop from a DAQ assist. in an ouside while loop

Hello, I'm currently a student working on a senior project and I'm trying to do a state machine that will turn off and turn on a compressor depending on time and coprocessor failure.
In the run state, wich is #1 on the case structure box I placed the DAQ assist. Which takes in data from an accelerometer. If the accelerometer's value is above the limit four times it will end the loop or if the time runs out it will end the loop.
The problem I am having is that i need to run four compressors. I was thinking about having four case structures all within the outside loop, but I can only have the DAQ assist in one location. This means that I now have to move the DAQ assist out of the run loop or run all four compressors in the one case structure. If i remove the DAQ assist. I can only get it take in data once when the loop starts and never again. I understand why, but is there a way to dynamically pass data froma DAQ assist. into a running loop?
Also on a side note, i can't find a tutorial on how to really create a state machine using Enums. Does any one know where to find this.
I have attached my curent program.
Thank you for your help,
Ryan
Attachments:
TEST STAND STATE MACHINE 2-28-07.vi ‏288 KB

in labview choose file->new... then pick standard state machine and there are instructions.
you can create a custom control and either use an enum, text ring or menu ring. Edit the values and then save the control and drop into your vi and you can wire this to your case structure
- James
Using LV 2012 on Windows 7 64 bit

No data output field in DAQ Assistant

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