sbRIO-9642 digital input maximum input frequency

Similar Questions

• sbRIO-9631 digital inputs/outputs using e/s node FPGAS and FPGA of i/o method node

  Hello, I'm trying to configure my SBRio-9631 for the first time.  I try to use the on boards to inputs and digital outputs.  The following code will work?  This is a simple "read the entries, 'or' some inputs and pass ' exits."  I have to add "E/s method nodes FPGA" between my 'FPGA of i/o nodes"to get"modes of State of sorting for the input and output lines?  Also, I can't simulate/test it works, by adding 5 VDC at the entrances, and not have any source of voltage output.  Thank you for your time.

  Hey, Spex,.

  I really, really appreciate your help.  Your follow up information was exceptional.

  Thanks again for your help and your time.

  gjmm

• Reduce the period of sampling of the digital inputs of NOR-USB-6009

  Hello

  I need to read a line of digital input in the NI USB-6009 using NOR Express 2013 Signal box. I selected 1 sample (upon request) as acquisition mode. I need to define a smaller sampling period as 1 MS, but it gives error too short sampling period: "the current sampling period is too short.  Please specify a longer sampling period. ».
  I do not understand the reason for it and a way to slove this.

  Any help would be greatly appreciated!

  Thank you!!

  The 6009 doesn't have a clock that you can set for a sampling period. According to the specifications, the digital I/o is software programmed - sample on request you use now. I'm not at all familiar with SignalExpress but I don't think that you can find near a reliable khz sampling frequency on Windows or any other os non-deterministic.

• Static digital inputs N samples

  Is there a way to set the sampling frequency during the acquisition of N samples from a digital input static? I use a USB-6216 data acquisition but the only option of timer is on request.  It seems that daq samples randomly I use acquire N samples.  My goal is to have a level of synchronization between my analog and digital input data for sampling at 500 Hz.

  Hi UpNSmoke,

  Unfortunately, the 6216 can only run DIO clocked by the software. If you use Windows or another non-deterministic operating system, you will be unable to achieve very tight synchronization (or high sampling rate). If you want your two analog and digital input tasks be hardware synchronized, I would recommend something looking from the x 622, 625 x or better yet, the new X-Series range.

  Hope this helps,

  Sean

• How can I measure the time between the two edges of successive increase, using digital input...

  Hello

  I'm trying to measure the time in seconds between each two successive rising edges on a digital input.

  So far I managed to detect the rising edge, increment a counter at each rising edge and take the time during which the increase is edge

  all I need now is subtract edge currently rising from the previous era of edge rising to calculate (T), which can be 1/frequency and display in real time for the user.

  but I do not know how to do this

  Can someone help me please!

  Note: while I am in a position varies between 200 ms - 2 seconds

  
  

• How can I measure the time between each two successive increase edges, using digital input?

  Hello

  I have tried two measure the time in seconds between each two successive rising edges on a digital input.

  So far I managed to detect the rising edge, increment a counter at each rising edge and take the time during which the increase is edge

  all I need now is subtract edge currently rising from the previous era of edge rising to calculate (T), which can be 1/frequency and display in real time for the user.

  but I do not know how to do this

  Can someone help me please!

  Woah!

  Sorry Apok, but your code becomes much too complicated and salty. I don't think that all records to offset or Boolean conversion/operators are necessary at all.

  If you want to measure the time between two keys so it's another (much less complicated) way. It simply records the time when press button in a registry change, then compares the two.

• A voltage divider will be enough to read a 28V pulse in NOR-6251 digital input ports?

  Hi all

  I am a scientist life sciences that attempts to read a 28V 4.2mA pulse signal sent from my operative box animals in my NOR-6251.

  Sounds like a voltage divider should do the job. But I would be aware of anything else that my card OR not to burn? And should I be concerned about the current entry in the map OR?

  Thanks for your help!

  Hello

  Research on page 7 and 8 of the Datasheet of NOR-6251 , it shows that the maximum voltage is 5.25V, so use a voltage divider to make 28V up to 5V and you should have no problem providing you can guarantee your 28V source will always be to 28V or less and your resistances are fairly accurate. Under no circumstances should provide you more 5.25V to the digital input.

  The only concern you have on current is that the resistance divider is not affected by the impedance of the digital input which is little likely (datasheet says max 250uA), so if you use resistors around the range of 5 to 50 k, you should be fine. Also, be sure your part of wiring resistance as if she had the wrong way, you will have a great chance to break the map!

  I hope this helps!

• How to count the pulses with digital input on 6351

  Hi all experts in Labview,.

  I just got my USB x series 6351 and it works fine, but I certainly lack of labview skills to use it to its full potential.

  I would like to read digital pulses with several digital inputs and count the number of pulses each T interval in time. All impulses that I entered on any edge of the clock are not synchronized and can occur at random times during the tests. Basically I have an oscillator of square waves can I modulate the frequency. I don't want to use the meter as inputs as I'm limited to only 2 entries (if I use the option 2 input meter for metering of pulses or frequency). The input frequency can range from 0-1 kHz and goes 0 - 3V. So not too fast, and I shouldn't make too many mistakes trying to get the count of pulses and then back out the frequency in accordance with article ni.com on counters.

  I would like to read the 8 digital input channels and get the number of impulses for each channel. I searched high and low for help online but can't find examples that have been useful. Anyone have any ideas on how to go or direct me to a resource? Thank you very much in advance!

  Are you worried about getting the number as a physical operation timed?  It would be nice to acquire a digital waveform and then postprocess on it to detect how many events took place?  I've attached an example that shows how you can accomplish this. It reads a digital waveform and then uses a detection of crete VI to determine how many pulses occurred. Should be a few adjustments to your particular signal.  The VI I use seems to count events twice (probably count each edge), so counting it gives should be reduced by half in order to work.

• The iMac has a digital input?

  Hello

  I searched for centuries for the answer to what I thought was a simple question - the iMac has one digital input (optical or other)?

  I know that the headphone port doubles as an analog audio to as well as an optical digital output, but this port also accepts input optical? If not, is it possible to enter a digital signal via a USB port?

  I have an iMac (20-inch, mid 2007).

  Thanks to all who can help.

  AL

  Yes exit usb audio and are truly comprehensive external soundcards, they can have any type of entry and exit of the machine to be desired that they have

  and if they do a driver of OS x for him it's just a matter of connection installing the driver and choosing the entry in system preferences for being that

  https://Flipboard.com/@mariahlolas/top-10-best-USB-external-sound-card-adapters-for-Windows-and-Mac-2016-2017-npa5lltvz

  If the audio minijack that also take in charge the headset for iPhone I believe support the digital input and I don't know if

• Digital input to Toshiba 46TL-> no analog audio output to amplifier

  Hi all

  When I connect a video source (e.g. computer laptop via DLNA) to my 46TL, output TV audio analog (red/white taken connected to an amplifier) does not work.

  It does, however, watching television.

  Is it possible to configure the TV to read the audio data from digital input (HDMI/DLNA) to the analog output?

  Thank you for the help

  Not quite what series of TLxxx you have, but for example the TL938 supports a digital (optical) audio output port that provides a digital audio signal.
  Why n t connect the amplifier to the TV using this Jack?

  Connectors for component video / audio to the rear of the TV are the ports of ENTRY and not the OUTPUT ports. So, you can send an audio signal to the TV and not the amplifier output.

• Interrupt with digital input

  Hello

  I am relative new to LabWindows.

  I have a program that starts when I press a button. The program controls a motor. Now I press a button on the motor and the program must cease (Safty Stop). The button is connected to a digital input on my card (PCI Express 6343). Now, I have the question, how do I program the interruption? I know not how do in CVI (controls the digital input whenever the program runs).

  I hope someone can help me.

  Best regards

  The starting point must be to look relevant examples that NEITHER provide:

  ReadDigChan - ChangeDetection.prj

  and

  ReadDigChan - ChangeDetectionEvent.prj

  However, I must advice against using a PC as a "Safety Stop". As a general rule, the PC are completely inappropriate to the core functions of security, unless you follow the standard IEC 62304 relevent to the letter. Tip: it's hard to do with a PC. To implement safety functions such as emergency and interlocks stops you buy much better a specialist dedicated safety relay and following the instructions of the manufacturer. If life-threatening energy (either electric or medcanical) may be present, then consult a professional engineer.

• How can I set up a digital input task to read continuous samples?

  I am trying to create an exclusively digital task that will make digital readings at a rate timed by the material using a PCIe-6509. However, when I try to put the task timing as follows (which works on a PCIe-6509), I get the following error:

  Requested value is not supported for this property value. The value of the property may be invalid because it is in conflict with another property.

  Property: NationalInstruments.DAQmx.Timing.SampleTimingType

  Required value: NationalInstruments.DAQmx.SampleTimingType.SampleClock

  Possible values: NationalInstruments.DAQmx.SampleTimingType.OnDemand, NationalInstruments.DAQmx.SampleTimingType.ChangeDetection

  Task name: DigitalInputTask

  State code:-200077

  The relevant parts of my code are:

      public class DigitalInputReader: IDisposable
      {    
          public DigitalInputReader()
  
          {
  
              dataReadyHandler = new System.AsyncCallback (DataReadyEventHandler);
  
  daqmxTask = new DigitalInputTask();
  
              daqmxTask.Configure (Globals.NI);
  daqmxTask.Control (TaskAction.Verify);
  
              daqmxTask.Control (TaskAction.Commit);
  daqmxReader = new DigitalMultiChannelReader (daqmxTask.Stream);
  
          }
  public class DigitalInputTask: task
  
          {
  public DigitalInputTask(): {base ("DigitalInputTask")}
  public virtual void Configure (NiConfiguration niConfig)
  
          {
  
              <= niconfig.digitalinputs.count="" -="" 1;="">
  
              {
  
                  String physicalChannelName = niConfig.Device + "/ port" + niConfig.DigitalInputs [i]. Port.ToString () + "/ line" + niConfig.DigitalInputs [i]. Channel.ToString ();
  
                  String nameToAssignToChannel = niConfig.DigitalInputs [i]. Name;
  DIChannel ch is this. DIChannels.CreateChannel (physicalChannelName, nameToAssignToChannel, ChannelLineGrouping.OneChannelForEachLine);
  
                  c. InvertLines = niConfig.DigitalInputs [i]. InvertLines;
  
              }
  
              var signalSource = "";
  
              This. Timing.ConfigureSampleClock (signalSource, Globals.MachineSettings.SampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples);// Globals.MachineSettings.SamplesPerChannel);
  
          }
  
      }

  The last call to Task.Timing.ConfigureSampleClock, it's which throw errors.

  Of the options available, or SampleTimingType.OnDemand or NationalInstruments.DAQmx.SampleTimingType.ChangeDetection provide the same precisely timed calls that I am familiar with the analog input interruptions.

  How is it possible in a digital task?  I mean, it seems that I could set up another task to do call by material for the production of a clock signal and use the ChangeDetection synchronization mode, but this seems a bit complicated for what should be easy to do.  What Miss me?

  Update: I thought about it.  You cannot call ConfigureSampleClock when the digital input card is a device of 650 x, because these devices have any automated examples of clock.  They are configured to run in mode default finite samples.  You must make all sample synchronizing with these devices in the software.

  Be cautious, however, because the .NET timers ensure they put any faster than their scheduled interval.  In practice, they are usually 5 to 10 ms slow by tick.  This means that if you want to read samples every 100 ms by sample clock, you'd end up reading all 108 ms samples.  All counters based on the elapsed time and number of samples would be away after a few seconds of it.

  Instead, you must do one of four things: write a doggone driver that runs in ring 0 and interfaces with the PCIe card in the required interval (i.e. on NC, not you, in practice), tolerate the inclination of the clock, use a multimedia timer as an interruption audio or video that is more likely to respond to the correct interval, or , my solution, an accurate clock allows you to set the interval of the timer.  I wrote the following code to the timer:

  var CorrectiveStopwatch = new System.Diagnostics.Stopwatch();
  
  var CorrectedTimer = new System.Timers.Timer()
  
  {

  
  Interval = targetInterval,
  AutoReset = true,
  };
  CorrectedTimer.Elapsed += (o, e) =>
  {
  var actualMilliseconds =;

  Adjust the next tick so that it's accurate
  EG: Stopwatch says we're at 2015 ms, we should be at 2000 ms
  2000 + 100 - 2015 = 85 and should trigger at the right time
  var StopwatchCorrectedElapsedMilliseconds = newInterval +.
  targetInterval-
  CorrectiveStopwatch.ElapsedMilliseconds;

  If we're over 1 target interval too slow, trigger ASAP!
  <=>
  {
  NvelIntervalle = 1;
  }

  CorrectedTimer.Interval = NvelIntervalle;

  StopwatchCorrectedElapsedMilliseconds += targetInterval;
  };

  I hope this helps someone.

• How to combine several digital inputs for playback?

  Hi comrade Labview users.

  I just started using LabView and I am very new to it. I know him understand how it works and you have something to work, but I need to be more effective.

  I use DIO96H - USB DAQ Measurement Computing, which includes 96 digital inputs. I use the DAQ to acquire the activations of relay and record the number of times the relays flips.

  Basically, I created a digital input read and then copy & pasted 95 times... it works but I know that's not the best way to use LabView.

  

  How can I change the digital input (Di1/1stPortA/dev0) in multiples so that it iterates through all 96 channels without copying and pasting the same pattern over and over again?

  Leon

  You have the correct polymorphic instance for playback? Once again, for the material OR it would be a NChan Read. There should be a similar choice if I remember correctly.

• Digital input current limits

  Hello

  After reading everything that specifications and manuals, I decided to ask a general question.

  In the data sheets, user guides I've read, in general, there are two warnings for DIO:

  -Do not connect the outputs digital circuits which operates above the limits.

  -Do not drive the line with tensions outside its operating range.

  Generally speaking they tell me I need to know when dealing with output and voltage when dealing with entries. So I have this question, can I wire a power supply for digital inputs directly without exceeding its "beach of normal operation and without any protection circuit? In fact, my feelings, this is not possible. But why certain documents produced clearly mention that the impedance internal inputs while that of others is not clear those? How can I determine if I can connect a signal directly to an entry (for example USB-6525 indicates a current limiter circuit, but I don't see a clear explanation in the datasheet USB-6251)?

  As long as the input voltages are within specified limits, no damage will be the DAQ hardware. Logic devices often have two lines of non overlapping input, one for low input and high input. If the input voltage lies between the beaches, the performance of the device can be unpredictable. Also, check your power supply to make sure that this doesn't not exceeding when turned on or off as that could exceed the DAQ limit.

  Lynn

• Digital input triggering

  Hello

  Is it possible to trigger action digital input using the signal I want to measure? In the example:

  I want to measure PWM on P0.0 after first rising edge PWM on P0.0, but using only this line P0.0 (no PFI in use, only one used digital entry).

  IM using X SERIES USB-6353.

  Some DAQ cards can trigger on analog edge of the signal you want to measure. If a DI data extraction, it is possible to select only the PFI or similar as trigger. What is your application? What you want to achieve?

  I can imagine you could workaround: record streaming samples of DI and do a SW trigger in your program, so you can get the same samples prédéclenchés (as in a digital oscilloscope).