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Found 10 results

  1. Dear All, I'm new to this forum and I'm really glad I became a member. I am currently in the phase of designing a simple program which can control all the DAQmx channels using a configuration file (.ini) which is capable of change voltage range during mid-simulation. At the moment my .ini file reads as follows: [AO Channel 1] Name = T2 Physical Channel = cDAQ1Mod1/ao0 Max Value = 10 Min Value = 0 [AO Channel 2] Name = T3 Physical Channel = cDAQ1Mod1/ao1 Max Value = 10 Min Value = 0 [AO Channel 1] Name = T2 Physical Channel = cDAQ1Mod1/ao0 Max Value = 5 Min Value = 0 [AO Channel 2] Name = T3 Physical Channel = cDAQ1Mod1/ao1 Max Value = 10 Min Value = 0 My LabVIEW VI for the .ini script is attached. I'm relatively new to using configuration file functions and I don't really understand where "Get Key Names" section should be wired to. I have placed a constant on it for now which reads the "AO Channel 1" but how can I get it to read all the channels in the .ini file. I am welcome to all suggestions here, I just want to make sure that I don't cause any problems to any of the channels and use best practice methods. All constructive criticism welcome! Thank you. Read Configuration (INI) File (1).vi
  2. Hello all, My question is: what is your preferred non-volatile way of storing daqmx task configurations? Backstory: For a long time I've used ini files to maintain task configurations between executions of a program. This has worked for primarily static DAQmx configurations but I'm looking at creating a test executive with some degree of flexibility, which means daqmx task configurations start to get more complicated. If you use MAX for storing your tasks: Do you run into problems accessing and maintaining these tasks even though you don't have direct access to the file? Or is there an unlisted storage location for these files? If you use ini/text based files: How do you keep things orderly? I'm running into all kinds of limitations with the format. If you use XML: Where did you find your schema? Did you write it? I know NI saves tasks as XML files, and so therefore the schema exists, but I haven't been able to figure out how to use it. I've created a task in my project and then dug through the XML of the project to find the attached image. I believe this would be the ideal solution, but a little bit of digging in around NI.com (I know...) and google (actually useful) has resulted in no answers. I know there is an elegant answer to this question, I've just not found it yet. Thanks in advance for your comments. Cheers, Tim M
  3. Hello, I'm using the 9229 and borrowed a community example to log 4 voltage inputs to TDMS. I need to output RMS voltage on channels 1&2 and the wavform on channels 3&4. Essentially what I've done is averaged channels 3&4 using the same # of samples that the RMS is averaged, that way I'm able to make sure they are time synchronized (see code attached). Another advantage doing averaging the samples is that I am reducing the amount of data to analyze later. When i compare the TDMS read results to the # of samples in the TDMS file there seems to be a discrepancy in time. I tried to add a time stamp to the logged TDMS file but couldn't get it to work. besides using time stamps, Is there an easy way to confirm that I am saving all of the data I am capturing? Eventually i will be logging data at 30min-40min intervals so I want to make sure that i'm not losing data. TDMS_Logging_Simple_4chan.vi
  4. Lets pretend I wanted to simulate a solar panel using a cDAQ, a programmable power supply and a light sensor. Id have to measure the voltage from the light sensor and the PSUs current, use those values to find the respective operating point on my light/voltage/current-curve and update the PSUs settings. Lets also say I wanted to do this for multiple systems in parallel, all connected to 1 analog input and 1 analog output module in 1 cDAQ. What would be the best way to achieve the quickest response time? Simply reading and writing single samples seams to be pretty slow (though I can encapsulate everything neatly this way). Is there a better way?
  5. I am trying to implement a simple DAQ Watchdog with single digital output but cannot find any logical way to reset the Watchdog timeout signal. One of obvious solutions is invoking DAQmx Reset Device.vi. Unfortunately, it does not work. The Watchdog goes to timeout state but the physical output signal does not turn to High. For some obscure reason (typical non-qualified guess:) I added bottom part of the code that is red-framed in the BD. The only difference between functional and non-functional code is using DAQmx Start Task.vi, that is located in “Solutionâ€-driven case structure. If Boolean control “Solution†is True, the code works; if False, it doesn’t. Please help to understand why launching conventional Digital Output task is necessary for normal functioning of the Watchdog? PS: Attempts to use clear expiration command instead of DAQmx Reset Device.vi were not successful. PSS: HW is PXIe-6358 PSSS: Unfortunately, I cannot post any image here. Any image format results in "You are not allowed to use that image extension on this community" . The VI is attached. watchdogTest150817.vi
  6. Hello, I have created a vi that controls multiple writes (individually) by a switch. I have it so one individual switch controls one individual write (And is linked to individual clear, stop, error daqmx blocks). I do not think this is efficient as it takes about 4-6 seconds for the switch to actually write (True or False). So, I was wondering if someone could help me make my code more efficient so it would run a bit faster. Thank you Digital Outs fine.vi
  7. Hello, I've been struggling with this problem for months now... I want to use a cDAQ9171+NI-9234 with an Advantech PC (AIMB-580). I have 3 computers like this and all with the same problem. I plug the USB cDAQ-9171, Windows detect the device and loads the proper driver (cDAQ-9171), it is displayed in MAX but self-test or reset always fails with error. At the same time, NI Devive Loader service hangs up. If I try to restart or stop this service it cannot complete the operation, the only way to finish this operation is to unplug the usb cable from the PC, then the service restarts correctly. Additionally the windows' event logger shows the next error message: or In one PC I re-installed Windows, installed DAQmx 14 and the problem was still there, this is with a Windows fresh-install... After this, I removed DAQmx 14 and installed DAQmx 9.8 (supplied in CD) and the it worked!!! I upgraded to DAQmx 9.9 and it was still working, so I stoped there as it was all I needed (9.8 has some bugs with NI-9234 that 9.9 solves). One thing to note, when it works, Windows first install cDAQ-9171 driver, but then inmediatly it changes to USB flash firmware updater, after this it returns again to load cDAQ-9171 and detects the NI-9134. When it don't work it only installs the cDAQ-9171 and doesn't load anything more... I tried in a second PC to repeat the process, but I have been not able to repeat the success, only the fail... I get the same error every time I plug the USB and I have not idea of what else try... I have disabled UAC, cleared the MAX data, reinstall windows 2 times, tried with DAQmx 9.8, 9.9 and 14. Forced USB flash firmware updater as Windows driver, changed BIOS settings (disable hyper-threading, VT extensions, USB legacy, etc.). I am almost sure that it is some kind of weird incompatibility or similar, the thing is that NI device loader always hangs-up. In the next days I'm going to try to copy the same exact configuration of BIOS from the working PC, just to be sure. Any recommendation?
  8. This one caused me a day of grief. Turns out an error in the start up logic of one of my applications would request a duty cycle of NaN to a counter output I'm using for pulse width modulation. The problem is the NaN request goes through without returning an error. But the next request to update the duty cycle hangs the DAQmx write VI. After hanging, there's no way out, aborting the calling VI leaves LabVIEW in a sorry state. Example: WARNING: Running the snippet above can leave LabVIEW in an undefined state. Save your work before you do so! Now obviously a NaN duty cycle makes no sense, but I'd expect DAQmx to be able to handle such requests gracefully, either by ignoring them, or preferably issuing an error. I've observed this behavior on the USB-6343 device.
  9. Hi LAVA, I need some help. I have a motor that moves a tray. During the movement of the tray, 2 switches will change value. I want to read out the counter value / motor position when the signal of the switches changes. (rising and falling edges) At this moment the only thing I can think off is a loop vi that reads the value of the swicthes and motorposition and evaluate the swicth states... But i'd rather have the position reading triggered by the digital lines. I'm running LV2010SP1, DAQmx 9.4 Hardware: cDAQ chassis: 9178 NI 9401 module => encoder signals are connected to this one. NI 9403 module=> 2 digital inputs(so the switches) are connected here. Thanks in advance for your help. Best regards, Wim
  10. I would like to programmatically change the alias of a couple DAQmx devices to make a program more versatile. I have found an example at ni.com that will do this; however, it is in version 8.6 and I have 8.5. Could someone please visit that page and save a screenshot? https://decibel.ni.c.../docs/DOC-15998 Thanks.
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