Problem in reading the PWM signals in myRIO 1900

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• Why are there at - it such a delay, write and read a PWM signal to digital input?

  Hello!  I am trying to read and take action on a PWM signal.  The equiptment I'll have access to: 9201, 9425 and cDAQ-9172 chassis of NOR.

  That's kind of what I'm experimenting with now (I have tested with a device USB 6211).  Someone at - it a better idea how to do that?

  The problems that I encounter:

  (1) it seems there be then buffering of questions?

  (2) it takes too long.

  My vi is attached.

  Thanks in advance for any help you can give.

  Also, in my final application, I will not have to create the PWM signal - this is just to test the acquisition currently.

  Try to use functions DAQmx directly rather than the DAQ Assistant.  They are a little more work to learn but are more effective.  Your 6211 can generate a PWM signal in hardware, so use it (see examples of LabVIEW).  Finally, of course there will be some delay in your code.  You read to 1.5 k samples to 1 k/second, so each loop cycle will be 1.5 s.

  EDIT: also, why you write 1 k samples and then read 1.5 k, both 1 k per second?  This means that your output will not generate any signal for long periods of time...

• read the analog signal 0-10 volts of NI6123

  I'm reading the analog signal of NI 6123. The range of the analog signal is 0 to 10 volts. This works well when the signal voltage is 0 to 5v (0 ~ 32767). But when the signal is 5 to 10 volts, the value read is always 32767. I also tried the different reading function: DAQmxReadBinaryI32, DAQmxReadBinaryU16, DAQmxReadBinaryU32. The value is identical to DAQmxReadBinaryI16. My OS is windows vista. Here's the part of my codes.

  **************************************************************************************************************************************************************************

  Create analog data tasks.

  DAQmxErrChk (DAQmxCreateTask("",&datHandler));

  DAQmxErrChk (DAQmxCreateAIVoltageChan(datHandler,"Dev1/ai0:7","",DAQmx_Val_Cfg_Default,-10,10,DAQmx_Val_Volts,NULL));)

  DAQmxErrChk (DAQmxCfgSampClkTiming(datHandler,"",RATE,DAQmx_Val_Rising,DAQmx_Val_ContSamps,RATE*MAXLAS));

  DAQmxErrChk (GetTerminalNameWithDevPrefix(datHandler,"ai/SampleClock",trigName));

  Create counter tasks.

  DAQmxErrChk (DAQmxCreateTask("",&ctrHandler));

  DAQmxErrChk (DAQmxCreateCICountEdgesChan(ctrHandler,"Dev1/ctr1","",DAQmx_Val_Rising,0,DAQmx_Val_ExtControlled));

  DAQmxErrChk (DAQmxCfgSampClkTiming(ctrHandler,trigName,RATE,DAQmx_Val_Rising,DAQmx_Val_ContSamps,RATE));

  DAQmxErrChk (DAQmxRegisterEveryNSamplesEvent (datHandler, DAQmx_Val_Acquired_Into_Buffer, SPLEEN, 0, EveryNCallback, NULL));

  DAQmxErrChk (DAQmxRegisterDoneEvent(datHandler,0,DoneCallback,));

  Start the task.

  DAQmxErrChk (DAQmxStartTask (ctrHandler));

  DAQmxErrChk (DAQmxStartTask (datHandler));

  In the call back function:

  DAQmxErrChk (DAQmxReadBinaryI16 (datHandler, SPLEEN, 3.0, DAQmx_Val_GroupByChannel, data.laser, MISS * MAXLAS, & (data.dataRead), NULL));

  DAQmxErrChk (DAQmxReadCounterU32 (ctrHandler, SPLEEN, 3.0, data.counter, SPLEEN, & (data.ctrRead), NULL));

  write data to the file.

  data.cfile.Write (data.counter, sizeof (int32) * RATE);

  data.cfile.Write (data.laser, sizeof (int16) * RATE * MAXLAS);

  **************************************************************************************************************************************************************************

  Thanks in advance

  To make sure that your device is working properly, I recommend first to test the entry in measurement and Automation Explorer (MAX) analog.  You can test your device by right clicking on it in the configuration tree and selecting test panels.  See if you acquired signal 0 - 10V as you expect.  The next step would be to try one of the sample programs that perform a task of analog input.  These examples can be found in the start menu > programs > National Instruments > NOR-DAQ > text based code supported.  Try an example that does an analog input continues and double bed (instead of binary data not adjusted).

  Your program looks good at first so I found nothing that stood out.  However, one thing to check is if your function generator (or signal source) expects a 50 ohm or high impedance.  This could cause reflections of the signal and cause the device to possibly read a voltage of half of the desired value.

• How to solve "here has been a problem to read the data in the layer. read the composite data instead? »

  Hello

  I'm working on the UI for a 2 month Word Press theme, and it has a ton of layers with file size of 900 MB.

  When designing, I get a message that says:

  "here was a problem to read the data in the layer. read the composite data instead? »

  Please solve this problem because I am so tired of working on this that I don't want this effort in vain.

  and sorry if my English is bad.

  

  Hi AymanAlrifai,

  Would you be able to share the file problem with me zipped upward? petgreen [at] adobe [dot] com

  I'll see if I have the same problem and check with the team to investigate the issue here and see if we can resolve it for you.

  Kind regards

  Pete

• Problem when the PWM signal combinning and analog signal TOGETHER!

  Hello everyone,

  first I DAQmx 6212, and I need to run the water pump small (9V - 16V) that should be driven by a PWM signal; I also have a motor (5V - 13V) for a water supply which must be controlled by an analog signal and it has built in a force feedback potentiometer, I logged onto this potentiometer correction + 5V the DAQmx and used the output voltage of the third extremety as a value to diagnose to know the position of the engine.

  My VI shows:

  1 is a normal meter production to create my PWMout signal.

  2 is an analog input, I use it as a PWMin to the LabVIEW to diagnose what is happenning in my pump water through the cycle and frequency.

  3 is an entry of the third extremety of the analog potentiometer.

  4 is an analog output that I used as power supply of the motor valve and I used an AC/DC amplifier for aplify signal the DAQmx and the motor road, between the two (3. 4.) I made a comeback with a few calculations, I had a P-controller to know the real position of the engine valve.

  My problem:

  When setting to 1. and 2. in the same VI only, I get an own PWM output with no problem.

  also with 3. and 4. in the same VI only i can control the motor valve without any problem.

  but when I put all these 4 set found in the attached VI, I have a problem as the engine valve turn continuously without stopping even if I change the position of the valve between 0 and 100%, I should mention that I see a PWM normal outside a signal on my oscilloscope, another thing to delete one of (1 or 2)  and run the engine valve VI works fine without any problems.

  so this my problem, if you can think of any solution please let me know.

  Thanks in advance for your help.

  Kind regards

  Caliente

  Here's your VI, slightly modified so the two analog inputs belong to the same task.  This if only for purposes of illustration, I him have not tested.  You will still need to do some debugging.

  While changing your VI, I noticed another potential problem with your original configuration.  You have configured the two tasks of AI for the same frequency, but read you 10000 samples of one of them and only 100 samples from the other (and throw it most of it).  Data acquisition data are buffered, and if you read as fast as you acquire, the buffer fills eventually.  If you read 10,000 samples of a channel, and the other channel acquires at the same rate, then when you read from the second channel you will get old stale data or an error full buffer.

• generation of two complementary pwm signals using myrio

  Hello, im working on a project and I need to generate two complementary pwm signals (when we go to 1, the other goes to 0) using myrio.

  the problem with the blocks of myrio pwm is that when you set the market factor, the signal always starts with its high value. Can someone help me please?

  Hello

  You can create a Boolean square signal with chosen service and frequency cycle, create its opposite with makes NO sense and then send both signals via Digital Out vi (myRIO/Default/Digital Out) to two different outputs.

  Best regards

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  I'm having a problem of reading new news of the widget. Maybe someone could help me.

  When I click on the title of a news article, it opens the browser, seems to go to the site news.qwapi.com and returns an erros indicating that the site is currently unavailable. Things seemed to work fine until a few days ago and I did not recent changes that I'm aware of that could be the cause of this problem.

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  I have 2 problems with reading spreadsheet file:

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  I have attached the .VI and my two files.

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  User

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  I currently have a PIC18F microcontroller serial communication with LABview using the base read and write.vi series. The PEAK sends strings such as "V222! (V is the character of the header, and! being the end character). Then, I have a program to take each individual character read and concatenate them in a larger string for data extraction. The port has been configured to 38400 baud and be only a single byte of long.

  The captain sends this one byte at the time and the problem here is that LABview seems to be only reading V most of the time, and occasinally has 2. Since it doesn't seem to be never read the end character, the sequence of extracting data from my code is never executed.

  A few questions I have are:

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  At very slow speeds, it could really work.  At 300 baud (3mS / bit), there are 33 mS to send a byte (8-bit + stop bit, start bit).  So if your loop runs fast enough, you get every byte one at a time.  But there is the overhead of other code to store the bytes, etc..

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  Filip Van Boxstael

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  [email protected]

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