Digital input event handler

Similar Questions

• Raising an event based on digital input? Treatment of a condition of emergency stop

  I'm working on a test sequence into LabVIEW.  I have a security which I am followed by a digital input the relay status, and I would like to pass to my failed state that I am in a State of emergency.  (In my case, this happens when a barrier is broken or emergency push button is pressed).

  It would be easy to do if I could use a digital input to trigger an event.  However, this doesn't seem to be possible.  I tried bind my digital input to a control, and then follow the State of the control as an event, but that doesn't seem to work.

  My main problem is that I can be in one of the stages of test 5 seconds approximately.  So far, I have not found a way to out or interrupt this step if my digital input changes state.  I can get it to transition to the failed state after the step in progress, but I want that it to transition immediately when the safety relay is broken.

  I've attached a picture that shows the basic structure of my program.  The actual program is much more complicated, so I hope this is enough information to get started.  I have stops in each loop attached together with the help of a subvi, which basically returns a Boolean TRUE if you press the 'stop' on the operator interface (it is one of the events of my structure of the event).

  

  It seems that it would be a fairly common situation that there must be some answer I'm missing.  Can anyone help? Thanks in advance...

  You need (somewhere) a loop that monitors the digital status and can detect the transition Fail.  The timing of this loop of 'surveillance' apply to how fast you can respond to failure.

  But now you need to trigger an event when this happens.  When I started programming in LabVIEW, I learned on the events of signs of value that could trigger programmatically a value indicator has changed.  However, a few years later I learned the user events, a more flexible method for generation "software interrupts' who have a number of advantages over value of signage.

  I don't know if you are looking for using LabVIEW or LabVIEW examples user events you'll find a good explanation for how to use these (use the Help Index, and then type user name).

  Bob Schor

• Control does not after the exit of the loop of event handler

  My application brings together several controls user input.  When the user presses the OK button, it exits the event handler and the treatment.  During the treatment, it is not able to read the new values of the controls.  And in fact is no longer meets the stop button.

  When executing the attached VI, you will find that you can press the button of the switch and the LED indicates the status of the switch (this is my input from the user).  Now, press the OK button.  If you press the switch button, you will see that it works only once.  In addition, the stop button unresponsive to user input.  If you do not press the button, the stop button will cause the 2nd loop exit.

  Why the 2nd loop is unresponsive to the switch?

  It is a simplified version of my application in which two loops are separate from the States of my state machine.  There are several other States as well.

  The case of the event of the "change value" event has the property set to lock the Panel before the VI when the event is raised until the case of the event is over.

  Because the left while the loop is running not but the structuer event is always active FP everything is locked.

  Uncheck this option in the "edit event".

  Tone

• Increment of 1 digital input

  Hello

  I'm doing a 1 by 1 meter with a digital input of my acquisition of data. I have a sensor connected to the digital input string and when it is activated, the program is supposed to increment a counter to 1. However when the sensor is activated, the counter takes account on and on (very fast). I want that it count only 1 with every pulse.

  I've tried everything I can think of, structure of matter, structure of the event, collector of signal sequence... but with no result. Is there a way to limit the number?

  Thanks, I hope someone can help

  You really need an edge detect.

  

• 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.

• With the help of digital input for Boolean control?

  Hello!

  I have spent a lot of time to search but have not found a solution to this...

  I have LV 2015 with chassis NI 9188 and module NI 9425 DI.  Try to use the input signal to assign a State structure machine program and/or events in real time.  It would be acceptable to have an indicator show the status of the input line, since I can use it elsewhere with Value (Signaling).

  Please do not ask for the code - the problem is quite simple.  I just want to use the digital inputs to program control as a T/F.  I want just the program to analyze the State of the input and decisions - a bit like a PLC.

  All I seem to be able to extract is data of digital waveforms with a task DAQmx.

  It's not a trigger - I already use a trigger to start the analog acquisition.

  Formulate the problem in a simpler way...  What to do if you had a digital input module and you wanted to see the status of each input line in the form of a LED on your face in real time.  How would you do it?

  I really appreciate the help!

  greyhorn23 wrote:

  Formulate the problem in a simpler way...  What to do if you had a digital input module and you wanted to see the status of each input line in the form of a LED on your face in real time.  How would you do it?

  I would like to write what has been read to the Terminal.

  From what I can tell, you want to just read a single static value from your digital line.  You can then simply read the value of one and do some logic with her.

• Element input event and oninput

  I'm trying to get a user input to work. I found a code on this forum to create the input field and add it to the stage, that works well.

  I would use the oninput event generated by the input field. I can listen to the event if I use the d.oninput (see code below), but I can't access this.gotoAndStop () from inside the event handler (gives a TypeError). Makes me think that there is a problem with the scope.

  I went back to the documentation of createjs and they suggest dcjs.d. event should do, but I get an error with that too - TypeError: dcjs is not defined. I tried with the onclick event following their example, but who gave the same error.

  I can get around it and the use of an indicator in a timer to check if you need to reset (which is what gotoAndStop (69) fact), but seems a shame.

  The code that creates the element:

  Create the input element

  var d = document.createElement ("input");

  d.style.Visibility = 'hidden ';

  d.style.position = 'absolute ';

  d.style.Left = 0;  defines 'the origin' to (0,0)

  d.style.Top = 0;

  d.setAttribute ("type", "text");

  round = 10;

  d.Height = "80";

  d.ID = 'inputField ';

  d.Value = 5;    Initial value in the input field

  Attach the element of CreateJS stage

  canvas.parentNode.appendChild (d);

  DCJS var is new createjs. DOMElement (d);

  DCJS.x = 55;  element position here

  DCJS.y = 105;

  stage.addChild (dcjs);

  It works, except for the call to this.gotoAndStop (69) creates a TypeError - does not recognize the function

  d.oninput = function() {}

  var entry = Number (d.value);

  If (isNaN (input)) {}

  Alert ("enter a number");

  } else {}

  printNumber();

  this.gotoAndStop (69);

  this.placeHolders (3, 4);

  }

  }

  It does not work - TypeError - does not recognize dcjs.d

  DCJS.d.oninput = function() {}

  Console.log ("Input");

  }

  Try:

  Create the input element

  var d = document.createElement ("input");

  d.style.Visibility = 'hidden ';

  d.style.position = 'absolute ';

  d.style.Left = 0; defines 'the origin' to (0,0)

  d.style.Top = 0;

  d.setAttribute ("type", "text");

  round = 10;

  d.Height = "80";

  d.ID = 'inputField ';

  d.Value = 5; Initial value in the input field

  Attach the element of CreateJS stage

  canvas.parentNode.appendChild (d);

  DCJS var is new createjs. DOMElement (d);

  DCJS.x = 55; element position here

  DCJS.y = 105;

  stage.addChild (dcjs);

  It works, except for the call to this.gotoAndStop (69) creates a TypeError - does not recognize the function

  var tl = this;

  d.oninput = function() {}

  Console.log ('input');

  var entry = Number (d.value);

  If (isNaN (input)) {}

  Alert ("enter a number");

  } else {}

  printNumber();

  tl.gotoAndStop (69);

  this.placeHolders (3, 4);  have not now what it is supposed to do but is probably problematic

  }

  }

  It does not work - TypeError - does not recognize dcjs.d

  /*

  DCJS.d.oninput = function() {}

  Console.log ("Input");

  }

  */

• Prevent the digital input

  Hello

  How can I avoid digital input from the user in a form (text) PDF field?

  I want the user to be able to enter any character, except 0,1,2,3,4,5,6,7,8, and 9

  Without displaying an alert or a sound, I just need any input digital diseable.

  Thank you.

  Enter this code in the script custom typing your text field:

  If (event.change) = event.rc (/ \d/.test(event.change)) == false;

• [JS CS5] problem with memory leak possible with the dialog box in the event handler

  Hello

  I'm having a very difficult problem.

  I am attaching a script in a handler for a menu item, by using an installation script menu that I wrote based on one by Marc Autret. My version of the script menu installation attach a bunch of event handlers at the same time, to the actions of different menu.

  What is the event handler, with that I have a problem is to prompt the user for a URL and then applies the URL as a hyperlink to the text selection, with our house style for the way in which the URL should look like.

  The problem is the following:

  1. all other installed menu actions work very well, except for this one.

  2. the addition of URL script works fine, when you run it directly from the script menu.

  3. the combination of #1 and #2 (using the script to add URL by function as an event handler in the Edit menu) blocks to InDesign. But it is only after the addition of URL script has finished and done what it was supposed to do!

  4. when I comment on the section of the script URL adding user input, so that instead of saying

  userInput = myDisplayDialog();
  

  It is said

  userInput = "http://thisworks.com";   // userInput = myDisplayDialog();
  

  It works well as an event handler.

  So obviously a problem with the dialog box, but only when adding URL script is executed as an event handler. My first guess is that this is some kind of memory leak, but I think I am following the model of. destroy() the way I saw it elsewhere.

  Someone knows something like that before?

  I can provide all relevant if necessary scripts, but they are quite complicated. The most important of them is the input of the user function. Here it is:

  var myDisplayDialog = function( defaultText ) {
    
      var defaultText = defaultText || "";
      
      var myDialog = app.dialogs.add({
          name: "Type in a URL"
      });
      
      var myOuterColumns = [];
      var myInnerColumns = [];
      var myOuterRows = [];
      var myBorderPanels = [];
      var myTextEditboxes = [];
      var myInput;
      
      myOuterColumns[0] = myDialog.dialogColumns.add();
      myOuterRows[0] = myOuterColumns[0].dialogRows.add();
  
  
      myBorderPanels[0] = myOuterRows[0].borderPanels.add();
      myInnerColumns[0] = myBorderPanels[0].dialogColumns.add();
      myInnerColumns[0].staticTexts.add({
          staticLabel: "URL:"
      });
      
      myInnerColumns[1] = myBorderPanels[0].dialogColumns.add();
          
      myTextEditboxes[0] = myInnerColumns[1].textEditboxes.add({
           minWidth: 300,
           editContents: defaultText ? defaultText : "http://"
      });
      
      var myResult = myDialog.show();
      var myInput = myTextEditboxes[0].editContents;
      
      myDialog.destroy();
  
      if (myResult == false) {
            exit();
      }
      
      return myInput;
  
  }
  
  

  Hi Richard,

  Unfortunately, there is no guarantee that the ScriptUI longer work.

  Thake a peek here: http://forums.adobe.com/message/2881364

  --

  Marijan (tomaxxi)

  http://tomaxxi.com

• have new macbookpro15 event handler 2.51.06 is necessary

  macbookpro15 new 2.51.06 event handler is required, this icon appears whenever the mac is restarted

  You have a printer/Scanner Epson attached to your Mac?

  If you do, try to update the printer driver on the Epson support site.

  Best.

• 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.