Time consume by Daq Task

Hi everybody
I am doing a normal DAQ operation(I,e DAQ Create Virtual channel, DAQ start, DAQ write, DAQ stop) I have not incorporated any delay so I expect a spike but all I am getting a pulse which is 7-9mS in duration. Is it normal condition or some problem in DAQ module(I am using NI-9264 AO module). Please give some suggation...
Thanks in advance....

Your example is using digital output, but your board is an analog board. I would recommend you use an analog waveform for your output. That way you can precisely determine the pulse width using the waveform timing characteristics. You may want to set up timing and triggering, as well, depending upon what else you are doing.
Your startup delays are going to be variable, depending upon what you have done before you run the VI. If you need to load the drivers, it will take awhile. If the drivers are in memory and the VI has been run once, the delay will be a lot less due to several layers of caching (the operating system, DAQmx, and LabVIEW). The delay from when you fire the run VI to when the output appears should be fairly constant. Note that unless your operating system is LabVIEW RT, 30ms to 1s random delays are a fact of life. They do not always happen, but they do sometimes and you need to prepare for them. The best preparation is to do as much of your timing and triggering at the board level as you can.
Let us know if you need more help.
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About DAQ task and writing to a line

Hi all,
I swtich from Labview to Labwindows and switch from traditional DAQ to DAQmx. I have two questions about using the DAQmx. Based on the example from NI, I write a function for a single sample output to a single digitial line
void WriteLine(int zero_or_one, char line_name[])
int error=0;
TaskHandle taskID=0;
char errBuff[256];
DAQmxErrChk(DAQmxCreateTask("", &taskID));
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I am calling this function to a single digital channel. For example, WriteLine(0, "Dev1/port0/line0");. I wonder if above code really writing to a single line or a port (8 lines). I have 4 cables connecting 4 digital lines of one port to 4 external device (so to control the on/off of the device). I use the above code to control one line but don't know why seems sometimes there are something output to other three lines.
The second question is: now every time I write to a line, I call above code, so it will create the task each time even I just write one bit to one line. In my code, write to the lines pretty often, so how much it cost to create task every time before I write to a channel? Should I create one task for each channel upon the initialization of the program and clear them when the code closed? I just wonder how labview do that? In labview, will it create the task on each writing?

RobertoBozzolo wrote:
Creating and destroying a task is a relatively time consuming activity, so if you need to write to the digital lines very frequently it is advisable that you create the task at program start and destroy it at the end, leaving only the start/stop inside the write function.
As of my knowledge, LabVIEW can be structured in a similar way if you use low level functions, while it creates and destroys the task if you use a DAQ assistant (there is a note on this in the help).
With reference to your last question, you could have a single task for analog generation and simply set the appropriate rate with calling DAQmxCfgSampClkTiming before starting the task.
Thanks RobertoBozzolo. I am still in confusion regarding the analog output in DAQmx. I have an array of samples (totally 512 samples), I need to send to a specifc analog channel (A0) such that each sample will be sent at the interval 1millisecond. From your link, I use DAQmxCfgSampClkTiming
int error=0;
TaskHandle taskid;
double samples[512];
// initialize samples here
DAQmxCreateTask("mytask", &taskid);
DAQmxCreateAOVoltageChan(taskid, "Dev2/ao0","",-10,10,DAQmx_Val_Volts,NULL);
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DAQmxWriteAnalogF64(taskid, 512,0, 10, DAQmx_Val_GroupByChannel, samples, NULL, NULL);
// I don't start the task automatically
// some other time-consuming code here
// after other code running, I start it manually
DAQmxStartTask(taskid);
DAQmxWaitUntilTaskDone(taskid, 10.0);
DAQmxStopTask(taskid);
I wonder if this code looks right? There are 512 samples to send, so I set the numSampsPerChan in DAQmxWriteAnalogF64 to 512, is that correct?
The same channel will be used for other output also. So after the above task done, if I want to send one sample instead of 512 to the same channel, does the following code work?
double one_sample_value = 0.2;
DAQmxStartTask(taskid);
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What I am asking is do I have to reset the timing since it was set for outputing multiple sample at some rate before but now I only have to send one sample immediately, so does the time or update rate matter?
I am porting a big system which written in Labview 8 to CVI but there are so many code needed to be changed, I don't even know how to tell if the DAQ do the same thing or not. So I separate it as above code for testing.

How many DAQ tasks per loop?

Hi to everybody, I hope anybody can help me with the next case:
I am working on a system in which I have to read signals of 5 different sensors which have different ways to communicate (4 - 20 mA, voltage, RS-232, ModBUS, etc.) with the DAQ Device (cDAQ in my case), at same time when I am reading the variables I must check for the state of several digital inputs to verify connections and if any is interrupt I must stop the Data Acquisition.
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Or if I should divide the tasks in a multiple loop architecture.
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and the different ways to get the measures, specially which are by protocols (ModBUS, RS-232), all this by the response time.
Thanks in advance, all suggestions are welcome!

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DAQ task update during running task

Hi,
I hope sombody can answer this question.
Is it possible to update a running DAQ task without stopping the task?
In my task I have an analog output and I want to change the amplitude and/or the duty cycle of the output waveform.
Stopping the task and starting again with new parameters needs to much time.
Thank you,
Robert

If you're just looking to write new data to the task then there shouldn't be any need to restart it (you can use AO with non-regeneration like DianeS mentioned). I wanted to make sure to mention that we have an online example that does just this:
Update Multiple Channels of Analog Output On-The-Fly
Additionally, there are some properties that are settable while the task is still running (e.g. AO Sample Rate can actually be changed on-the-fly on many of our Multifunction Boards). Other properties (e.g. AO Voltage Range) cannot be modified without first stopping the task. If you need to stop the task and reconfigure, Ben's method is a good idea. I am aware of an example that does this for Analog Input tasks but I don't think we have one for AO. Here's the link to an AI version in case anybody is interested (unlike AO, the AI Sample Clock is not changeable on-the-fly):
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From what it sounds like, the first link should be exactly what you need and you shouldn't need to worry about restarting your task. Just add Duty Cycle to the control cluster and wire it into the
correspnding input of the Basic Function Generator. If you have any questions about it or run into any issues don't hesitate to let us know!
Best Regards,
Message Edited by John P on 03-25-2010 06:35 PM
Message Edited by John P on 03-25-2010 06:36 PM
John Passiak

How can I combine these two DAQ tasks???

I am using LabVIEW 11, Windows XP, cDAQ-9174 chassis, two NI-9205 modules.
Please see my code for reference. I am very new so i will accept all suggestions.
I am acquiring 12 volatage signals in a producer/consumer structure giving me a queue of 1-d array of waveform(dbl). Then I am acquiring 12 voltage signals in another loop giving me 2-d array of waveform(dbl).
There is an issue creating the channels. How can I combine these two tasks?
Thanks,
~Chris
Attachments:
WaveTest_6.2.vi ‏558 KB

Hello chrisbe723,
When you say that there is an issue creating the channels, are you getting a specific error message when running your code? Also are you referencing the same set of channels for the two DAQ task you are configuring?
Paul-B
Applications Engineer
National Instruments

Two DAQ tasks in a certain sequnce

Hi everyone
my mission includes two DAQ task, one is AI (voltage input), the other is DO(counter PWM output). the problem lie in the somewhat time sequence. that is,
in a word, the recording (AI) is a little longer than generating (DO).
for clear description, there are three episodes,
1. recording began and last 50ms, at 1000Hz rate,
2.the PWM generation began after recording began 50ms, the PWM frequency and duration could be set by a controler, meanwhile, the recording go on
3.when the PWM output ends, the recording   keep last 100ms, then recording completes.
the point is that the recording couldn't be disrupted by the PWM in the whole mission.
How could I  arrange the two task ?
my card is a M series one.
THANK YOU advanced

Yamaeda 已写：
- Setup the two tasks
- Start AI task and Read 1D array of 50 values (samples)
- Start DO task.
- Poll Task complete in a 0ms wait loop
- wait 100ms
- Read AI task 1D array with -1 samples (grab all)
/Y
Thank you very much! Yamaeda.
I am freshman. May I ask more clearly?
1.Do you mean that it doesn't obey syntax? when a task line include more than one "DAQmx read.VI", and as a matter of affect, the recording isn't interrupted between two DAQmx raed.VI?
2.How to merge the the two"read.VI" output in one awaveform chart  rather display them separately in two chart?
3.How to insert a wait in the DAQmx task? use a sequence structure with a "programing/time/wait" or a "time delay express VI"?
thank you again!

Is it possible for a DAQ task to just stop responding to commands?

The software I am working on controls a NI USB-6501 digital I/O device using the NI-DAQmx library. When the software initializes, it attempts to create 10 "tasks" (for different I/O lines of the device) using DAQmxCreateTask(). If any of the tasks cannot be created, the software should close with an error message.
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Once the tasks are created, the software goes on to use them to manipulate the I/O signals of the NI USB-6501 device with DAQmxWriteDigitalLines() or DAQmxWriteDigitalU8(). The software does not check whether these functions return an indication of success or not... The assumption is that it works every time.
This is my question:
At run time, is it possible for a successfully created DAQ task to simply stop responding to commands? This is what I believe happened. I observed it only once out of hundreds of trials, but it is still a great concern. Only 1 task stopped properly controlling the NI USB-6501. All of the other ones continued to work properly. It continued to misbehave until I closed and re-started the software (thus re-creating all tasks).
And if it is possible for a task to simply stop responding, is there any way to prevent it?
-Mike

Your assumption that instructions will work every time without facing errors is excessive in my opinion. I never observed a daqmx task simply stopping responding to commands: every time it happened, an error condition was raised explaining the misbehaviour.
I would add some error checking where you are manipulating the daq board and look into the informations the error message gives you.
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How do I increase the precision of a timestamp acquired with a DAQ task?

Hi
I am using a DAQ task to acquire multiple channels of analog data. The waveform data already has timing information incorporated into it. I wanted to know if there was a way of increasing the accuracy of this timestamp information - (Its currently in seconds with a default ms offset for each sample).
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Brinda

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#9 Now you have the 10 recently converted to ACC songs... Select those ten, right click on them then the "Add to iCloud" option (which for me was the first time I had ever gotten to see it at all)
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So I've been a iTunes Match subscriber for about 6 months. At first it took me a few goes of it to get it down to about only 350 songs needing to be uploaded in Step 3.... Then the REAL frustration began.... From that point forward no matter what I tried I could NEVER get past Step 3. As soon as Step 2 finished and step 3 began, iTunes would crash. So for the past 5 months I have been unable to get those 350 songs uploaded. It wouldn't even do just one then crash. I was frustrated but after looking I could do without having access too those 350 songs at all times. But then there WAS a song that I HAD to have access too and the frustration began again. I tried EVERYTHING I could find on the internet. Uninstalling and reinstalling iTunes, turning Match off then on, deleting errored files (I only had 4). Playing with router settings, everything. I noticed a lot of people wondering about having music on external hard drives even which mine is. (I will say from experience if your using a USB hub to connect your external hard drives, try connecting them directly into your computers USB port to speed things up a bit). Then I started reading about people having success converting one troublesome song or two to ACC, deleting the old version, then "manually" right clicking on them and clicking "add to iCloud" My issue was that this option was NEVER available to me when I right clicked the songs in iTunes! Plus some of the 350 songs were already in ACC format. Tonight, after playing around I've found a round about way (and time consuming if your doing this for 350 songs like me, feel bad to those who have THOUSANDS) to finally get these songs to upload to iTunes Match. Here is what I did, and I REALLY hope this can help someone else.
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I know this is a bit time consuming, and you COULD do this just for the songs you REALLY wanted to make sure were in the Cloud if you wish. My thought was if I'm going to do it, I might as well do them all.
I REALLY hope this will help someone as I have read so many forum posts, websites, ect, with people just as frustrated as me. And it even made it more frustrating as I had seen new "solutions" posted online yet said solutions still wouldn't work for me. If you have any questions, please feel free to comment and I'll try to answer and help!

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adding the fields from the MSF template, but I beg you to reconsider.
My blog: blog.jessehouwing.nl

Time consume by Daq Task

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