merger acquisition of data to read input data 2 or several at once

Similar Questions

• Difficulty to read the instrument of series and acquisition of data simultaneously.

  Greetings,

  I have some trouble getting my VI read from my data acquisition and instrument of the series at the same time.  If I run the Subvi simultaneously (i.e. subANG runs in a window and subVEL is running in a second window) both return the correct values and behave as I expect.  However, if I call the Subvi in a society mother VI and try to run them both in the same loop structure subANG gets stuck and won't be reprobed with a signal change.

  I also tried to use a stacked sequence or plate to separate the execution of subVEL and subANG, but I still get no response to subANG.

  The point is is that, if I run Parent.VI in a single window and then creates a copy of subANG (call it '--copy' or other) and run it in a second window, Parent.VI behaves properly and will update the readings as they appear in '--copy '.

  I enclose 3 files.

  (1) subANG.VI - this bed an an inclinometer RS232 signal.  The signal is refreshed every 10ms or more.

  (2) subVEL.VI - this bed raw tension of a channel on the acquisition of data, calculates the average then that converts into a pressure difference and finally a speed based on the pressure and temperature inputs.

  (3) ParentVI.VI - they simply call and displays the Subvi

  My guess is that it's a buffer problem, but I am confused.  Someone out there in Labview Earth knows why this might be happening?  Suggestions welcom.

  It is not an instrument of series.  It is a UEI PowerDAq with their typical A/D and the cable.

  I found away to make it work by placing subANG and subVEL in some time different loops side by side in ParentVI.

• Acquisition of data reading zero intermittently

  I use 3 analog inputs of an acquisition of data USB-6009 to monitor and record the temperatures of my system.  This running VI constantly perform 1 read per second and periodically saving the values drop.  Everything works very well for a few weeks or even months, until that data acquisition shows suddenly have a value of zero.  unpluging the acquisition of data and by him plugging back in solves the problem.  Therefore, I assume that this is due to the DAQ or maybe the USB communication being refreshed power cycle that I get the correct values again.  Any ideas on how to test for the cause of this problem or preventive measures, can I take?

  I was the closing of thought and could help restore communication at the end of each day.

  Oh, and I'm using LabVIEW 2010 on Windows 7.

  Disable the 'power save feature' Windows 7 where it randomly disables your USB hub.  Go to Device Manager and go to USB hubs then the power settings.

• Read for the acquisition of data entries are overwritten

  Hey there

  I have a Daq reading input in a spreadsheet file

  Data acquisition was told that one is supposed to have some time a loop around it and I cannot get it to run without one, so good

  But my main problem is that it means that it replaces my written file each time that the loop repeats

  He also asked me to choose the file to write in several times

  How would I go about fixing this?

  Thank you

  Yes, you can convert digital to the chain, check the attached VI. I recommend you to go through the basic materials of LabVIEW and also play with example of NEITHER which comes with LabVIEW. Remember not to use the attached example and the acquisition of data, always use separate loops.

• How to connect dwyer SERIES 629 differential pressure transmitter to the acquisition of data 9219 and read the signal?

  Here is my sensor
  Pressure sensor

  Here's the DAQ data sheet:

  ACQUISITION OF DATA NOR 9219

  Here are my issues:

  First of all I don't know what is LO and HI exactly in the DAQ 9219 material.

  Second, I don't know what pin code I should connect the DAQ sensor signal wire. PIN 4 or 5 pin? The sensor has three pins, and I guess I should connect the other two wires to the power supply.
  Thirdly how to calibrate the sensor. In labview choose voltage in the wizard?

  I'm pretty new in this acquisition of data and I need your help.

  Thank you

  Hi SilasIII,

  Hmm well 3 sons are probably on the ground, the power and the return signal. The datasheet for the sensor says:

  

  First of all, you need to know which model you have (4-20mA, 0 - 5V or 0-10VDC). HI refers to the return signal, LO essentially means the land of the food that feeds the sensor. Then, you must get the 13-30 VDC supply. I don't think this should be too complicated and can be a simple wall DC power. You can learn how to create a custom in DAQmx scale. I hope that this is a starting point.

  Kind regards

  Eric

• Use two assistants for the acquisition of data at the same time

  Hello

  I want to read multiple data channels of analog inputs on my DAQ hardware. However, when I try to create two separate data acquisition assistants for each entry, it gives an error saying "is reserved for the specified resource. The operation could not be performed as indicated "." Can't use two assistants for the acquisition of data at the same time?

  I have to add different channels in the same assistant DAQ? I tried, but I couldn't separate the data in different graphs.

  How does this work?

  Kind regards

  Allard

  You can't have multiple tasks of the same type (in this case inputs analog) on the same device.  Just so having 1 DAQ Assistant read all your channels and separate your channels for individual transformation.

• Edge counting and Source of Timing for timed loop on the request for Acquisition of data - not acquiring data on specified rising edge

  Operating system: Windows XP

  Hardware: PCI 6259

  Terminals used: PFI0 and PFI2

  Counters used: Ctr0 and Ctr1

  IM developing an application for the acquisition of data where timed loop synchronization source comes from my PFI2 (using the string A of an encoder).  IM basically trying to acquire data based on the number of ticks from my encoder.  For the synchronization source, I use counter 1 to capture the rising edge and have the loop time-acquisition of data.  At the same time, Im using the counter 0 to count the number of rising edges so I know exactly in what tick data was acquired.  PFI0 and PFI2 are connect to channel A of the encoder.

  Questions:

  Timed loop acquires data at each tick, because when I discover the data (text) file is missing count of my encoder value.  Is it because there is a limitation on the Windows operating system?  I used a noculars to measure the frequency at the maximum rotation of the channel encoder and 6,757 kHz.  All solutions?

  Also, is there anyway I can route the source channel internally an encoder to generate synchronization source instead of using another counter?  I have attached my VI.

  Hello

  All the samples that you acquire will be read by LabVIEW in a sequential manner. Figure 4-21 on the M-series on page 80 (4-34) shows that you will acquire all the samples you request all channels that you enjoy in sequentially.

• Acquisition of data using the DAQ card

  Hello everyone

  I need assistance with the acquisition of data of the generator of signals through DAQ cards. I plugged the signal to the SCB-68 generator where the analog inputs of the generator are connected to AI CH5 and AIGRND of the Terminal Board. Then the output of the block is connected to the DAQ card. The maximum sampling frequency of the card is of 250 kech. / s. The problem is for reason that I am not able to see the waveform on the labview. I looked at other examples to find the problem, I am, but I am not able to understand this. I want to be able to choose the sampling frequency. I attatched my code as an attatchment for you all to help me know what the problem is. Any suggestions will be appreciated.

  There is no task!  You have not specified any hardware (i.e. your data acquisition card) anywhere.

  Here's a suggestion.  MAX aperture.  Find your DAQ hardware.  Open a Test Panel.  Implement a continuous sample of N Points to some sampling rate.  Press Run and convince yourself that you get the data.

  Now, while remaining in MAX, to create a task, using the same settings.  Call for example something sensible ("MyFirstDAQTask" is not a good reputation).

  Now, go back to your code.  Eliminate the first two functions DAQmx.  Wire a constant task to the DAQmx Start feature.  See the little triangle down?  Click it, and it should show you the tasks he 'sees', the only one should be the task that you created in MAX.

  Note that 'Samples Visible' is now 'hard coded' in the task.  To get its value back out, you need to put a property node Timing DAQmx after the task start and pull on the quantity of the sample, samples per channel (which, for reasons that escape me, is a Dbl, you need to convert to an I32 before importing it into the while loop).

  Bob Schor

  P.S. Thank you to join your code.

• Acquisition of data from multiple loops

  Hello

  I tried to adopt a program of data acquisition of multiple loops with control of queue, but it does not work as it should. (Or at least the way I think it should) Could you please help me it smooth? I have seen a few screws on the internet with the queue-control and tried their adoption.

  My program should work this way: after you complete the settings, I begin the acquisition of data (an analog output and 2-4 analog inputs), but I only want to save the data acquired when I click on a registration button. (Then these data would go for further analysis). While doing the analysis, the acquisition may be suspended. However, when I click on record I would like to have a feature to instantly restart the recording and to ignore the previously recorded data.

  MainProgram vi is the application itself, with some settings made by the event handlers (now only limited to a selection of signal file and the channel settings). Then the data acquisition can be started by clicking on the button start the Acq.

  And these are my issues: first, sometimes the queue starts, sometimes is not (or at least it does not start the data acquisition). And the main point: I put the sampling frequency, but it is acquired at a slower pace of well (my signal has a delay of 4 seconds, but he needs at least 20 seconds before getting close to finishing). And the strangest: sometimes, especially after some time (about 1-2 min) it freezes and does nothing with the acquisition of data (yet labview seems sensitive, just my program blocks somewhere).

  So now only controlled acquisition is in the problem and firstly I don't like on the transmission data for analysis and recording. (Which seems to be the smallest problem).

  What I am doing wrong? Thanks for your help.

  I join all the files.  (MainProgram is the application itself, MY. SIGNAL is the signal I want to exit.) I use a USB-6211. (for physical work, home a simulated).

  Not directly related to your mistakes but (and here I don't mean to take on you, but...   With an alias as yours, I assume that you have some sense of humor)

  

  Really?  an event structure single image with only one case of timeout (value 1mSec) with a Dequeue inside element how do you code would work by simply removing the structure of the event entirely

• Acquisition of data and filtering on FPGA

  Hi all

  I have trouble to design a FPGA program for acquisition of data and filtering.

  I have two NOR 9205 modules configured to work in terminal mode of DIFF, i.e. There are 32 entries this program must read every Ts seconds. (Ts is the time discretization, i.e. during the period of loop)

  With respect to the digital filter, I implemented a possible simple filter with transfer function G (s) = 1 /(1+sT), which is part of the field of discrete-time equal to y (k) = a * u (k - 1) + b * y (k-1), where u is the original signal, and there is filtered signal. The coefficients a and b are equal to: a = 1-exp(-Ts/T), b = exp(-Ts/T), and T is the time constant of the filter (usually T > 5 * Ts).

  The implementation of main program for the acquisition of data and filtering are:

  

  This application is for the digital filter:

  

  However, the problem is that this program cannot take the FPGA resources on cRIO-9114, and Yes, I tried to define the criteria of compilation for the area. I also tried to implement the multipliers in digital filter as lut and DSP, unfortunately without a bit of luck.

  Because I don't have that much experience in programming of FPGA, someone has any suggestions how to improve this code to adapt existing FPGA resources?

  Best regards

  Marko.

  Hey Norbert_B,

  I managed to solve the problem. First, I changed the reentrancy of Preallocated incoming execution clone to not reentrant execution. As no reentrant VIs have States, I had to use the node of the feedback to the main VI to get u(k-1) and y(k-1). Another important thing is to choose Ignore FPGA reset method in the node of the properties of FPGA implementationfeedback, since in this case, the feedback node uses less resources.

  Here is the new main program VI:

  

  And here's the 'filter' VI:

  

  Thanks for the help!

  Best regards

  Marko.

• How to block a number of cardboard/acquisition of data to a particular program?

  Is it possible to "connect" a DAQ card serial number with a Labview design/program?

  For example, PCI-6601 is a serial number 12345 and I write a program (called ProgramABCD) to the acquisition of data, I want to "tie" / "bind" 12345 and ProgramABCD together, so that ProgramABCD will not work on an another PCI-6601 (unless I have change the serial number corresponding to ProgramABCD for the new PCI-6601).

  Thank you.

  Hi celine,.

  You could read the serial number of the device programmatically using a node property and then based on that, decide whether to terminate or continue the program. See this link: http://digital.ni.com/public.nsf/allkb/92F3F7C79579FA238625718700764F9D?OpenDocument

  However, if this will be distributed to the end user as a .VI file not an executable, then the end user could always go into the code and change/modify it so that it can use different devices with it.

• Generation and acquisition at the same time, acquisition of data USB-6356

  Hello

  I have a VI how is able to read entries with a USB DAQ-6356 and I use a generator of signals 'Agilent 33522 A '. I want to generate and acquire with the acquisition of data.

  In fact it works but not well, the frequency is not very stable and does not stop the 2nd loop with 1 (2nd is generating, 1 is Acquire).

  Thanks in advance

  P.S my VI isn't a state machine true because I need to fight against it at the moment.

  OK, so you're at 3 ms/s in writing and reading at 1.25Ms / sec and you wonder why he has a little difference in the frequency set?  Ideally, you want to read and write to share a sample clock but by selecting at least the same frequency clock (or one that is one multiple of the other) would go a long way to fixing this source of your error.

  The second source of error: you generate a contineous waveform.  unless you select 'whole number of cycles' there is a discontinuity when the end is reached at an arbitrary phase and the phase is reset to zero at the beginning of the wave.  DAQ assistant writing can "Use Waveform Timing" to adapt its sync settings to the dt waveform and the number of samples.

• Acquisition of data using C++ and cRIO-9066

  Hello!

  I want to write a C++ application that would make the acquisition of data from modules installed in the cRIO-9066 chassis and this application should work without LabView. How can I do? This chassis connect to my PC using NI-DAQmx? Is this possible?

  Hi aanodin,

  When you use a device that uses our architecture of RIO, it is usually best to use LabVIEW to develop your application. In this way, you can also program the FPGA with LabVIEW FPGA module and makes programming much easier real-time processor. In fact, your model of cRIO is officially supported by our LabVIEW programming language, as seen on page 4 of the Manual: (http://www.ni.com/pdf/manuals/376186a.pdf).

  Due to the FPGA interface, you cannot use DAQmx with cRIO. I hope this helps.

• Need a new acquisition of data USB multifunction device

  Hello

  Currently I use a PCIe - 6321 Multifunction DAQ hardware to control my stepper motor. I need to change the PCIe - 6321 and use the engine with a device for the acquisition of data USB multifunction bit PCIe - 6321. I'm not sure which USB model to select. Can I please get help about the choice of the right MIO USB data acquisition device that works similar to the PCIe - 6321.

  Thank you

  Bharath J S

  The 6212 differs from the 6321 somewhat on the digital side, which probably you use to control your stepper motor.  For example, it was only software DIO timed tasks and has only 2 counters with a set of features (e.g. no output meter in the buffer).

  Best regards

• Acquisition of data NOR usb 6008: a strange problem: mxwcgoutrunsilent.VI is not respected

  Expensive OR

  Today, I bought an acquisition of data NOR usb 6008

  and I'm using labview in 2011
  the problem is appear when after I end the process of configuration of the i/o data acquisition Wizard

  the following image shows the mxwcgoutrunsilent.VI is ignored and an error has occurred

  

  someone can help provide this VI for me

  What is the complete labview modules can also so I could do a real time data acquisition

  Best regards

  mangood,

  You received an error code? If so, what is it? What version of NOR-DAQmx driver you have installed? It seems your driver potentially incorrectly installed, and you may need to reinstall the driver.

  Here is the link to the latest version of the NOR-DAQmx driver: http://www.ni.com/download/ni-daqmx-9.8/4297/en/