Addition of alarms in real time

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  Hi all

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• How do I get the analog input signal and send it to output analog (real time)

  Hello world

  I do a simple task in Visual C++ and I use PCI-6221(37 pin).

  Basically, I want to send the same signal of "analog input" to the "analog output".

  at the same time (or almost), to make real-time application.

  Can someone provide me with sample program please.

  I would be grateful if you could provide me with the great tutorial that explains

  step by step everything about NOR-DAQmx for C/C++ programming.

  Best regards

  Khassan

  This is my code in C++, you can optimize it if that seems too messy. This code reads the analog input signals and exports it through the analog outputs.

  To make this code additional work of the directories include and library directories must be added to OR.

  I hope it helps someone.

  #include
  #include
  #include "NIDAQmx.h".
  #include

  #define DAQmxErrChk (functionCall) {if (DAQmxFailed (error = (functionCall))) {goto error ;}}

  int main (int argc, char * argv [])
  {
  Int32 error = 0;
  TaskHandle taskHandleRead = 0, taskHandleWrite = 0;
  Read Int32 = 0;
  float64 context [1000];
  char errBuffRead [2048] = {'\0'};
  char errBuffWrite [2048] = {'\0'};
  bool32 done = 0;
  Int32 wrote;

  DAQmxErrChk (DAQmxCreateTask("",&taskHandleRead));
  DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandleRead,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleRead,"",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,0));
  DAQmxErrChk (DAQmxCreateTask("",&taskHandleWrite));
  DAQmxErrChk (DAQmxCreateAOVoltageChan(taskHandleWrite,"Dev1/ao0","",-10.0,10.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleWrite,"ai/SampleClock",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));

  DAQmxErrChk (DAQmxStartTask (taskHandleRead));
  DAQmxErrChk (DAQmxStartTask (taskHandleWrite));

  While (! fact &! _kbhit())

  {

  DAQmxErrChk (DAQmxReadAnalogF64(taskHandleRead,1,10,DAQmx_Val_GroupByScanNumber,dataRead,1000,&read,));

  DAQmxErrChk (DAQmxWriteAnalogF64(taskHandleWrite,read,0,10.0,DAQmx_Val_GroupByChannel,dataRead,&written,));

  }
  _getch();

  Error:
  If (DAQmxFailed (error))

  {
  DAQmxGetExtendedErrorInfo (errBuffRead, 2048);
  DAQmxGetExtendedErrorInfo (errBuffWrite, 2048);
  }
  If (taskHandleRead! = 0)

  {

  DAQmxStopTask (taskHandleRead);
  DAQmxClearTask (taskHandleRead);
  }
  If (taskHandleWrite! = 0)

  {

  DAQmxStopTask (taskHandleWrite);
  DAQmxClearTask (taskHandleWrite);
  }
  If {(DAQmxFailed (error))
  printf ("error DAQmx: %s\n",errBuffRead); ")
  printf ("error DAQmx: %s\n",errBuffWrite); ")
  }
  printf ("end of the program, press the Enter key to quit\n");
  GetChar ();
  return 0;
  }

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  Hello

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  Arne M

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  I solved the problem.

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• Creating a Clone of VI in the real-time platform

  Hello

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  Thibault

  Hello

  I got it, it was similar to what you do on a normal LabVIEW VI. I expect a change in the name of VI in CloneXXXX.vi, but in real time, I think that you do not have this indication.

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• using NI USB 9201 with LabVIEW Real-time

  Hello

  I try to use a USB of NI 9201 on a remote real-time target. Here's what I did: 1) tricked out of a desktop PC to serve as target RT using the instructions provided on the Web site of NOR. He now starts in an RTOS with LabView RTOS 9.0. (2) I communicated successfully with the help of a host computer that has a windows with LabView 2009 BONE and I installed the software from the computer remote RT target host using ethernet. However, my problem is when I plug NI 9201 USB on the target RT that I do not see the material listed on the devices tab in MAX and interfaces on remote systems. I tried to get the manuals for the HW 9201, but it seems not much explained here, or maybe I'm looking in the wrong places. Any help is greatly appreciated.

  PS: I am attaching 2 JPEGs for additional explanations (tab network settings and the settings of the system).

  Thanks in advance,

  Benoit.

  AVS,

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• Output signals controllable DAQmx (real-time)

  Hello:

  I have a question here.

  It is quite difficult for me, and I can't find any bad example and discussion.

  Hope that some people give me some information for me to look it up.

  --

  I am trying to generate an analogue signal into a DAQmx device (I have an and uses it well) to control another device.

  The output signal must be the sum of a background signal (which is decided, let's say a sine wave) and another control signal.

  The control signal depends on the entrance of real-time control, for example by using the horizontal location of the mouse to the value of the signal.

  The background signal is designed in advance and it will run continuously (should not be stopped once the system starts to ensure that synchronization between each devices).

  At the same time, the control signal should be continuous. (if there is no new entry, it uses the default value or the last entry).

  --

  I have almost no idea on how to do it.

  As far as I know, needs only one daq task to write the signal, and then she runs after.

  The control signal is a thing in real time, so the task needs to be updated very quickly.

  But regeneration tasks cost 50ms ~ on my computer (and I used the low levels rather than the DAQ assistant Renault).

  Also, in this case, my background/control signal will be be stopped every time that when the task is regenerated (and this makes my synchronization failure.)

  I checked DAQmx in real time, but couldn't find a few examples of tris and seems it isn't for my application actually (?).

  A possible solution, I came is cascading my two signals once they are generated by my DAQ hardware. And then I can use an a/o to be the background signal and use an another a/o to be the control signal.

  However, my control signal is always interrupted between each loop, and the method of external cascade seems not smart.

  Or data acquisition is not perhaps suitable for this application?

  --

  Hope that some people give me some information and then I can check their.

  Thank you very much

  Hi Jhensi,

  How the example provided was for you?

  With respect to the delay that you experience, there is always a slight delay incurred as a result of underlying driver DAQmx running in the background.

  In addition, your USB 6611 will have inherent delay due to being used as the communication protocol USB bus. There may be up to 100ms latency in some cases with USB 2.0.

  This driver requires a certain amount of time to change the type of output signal, that is production.

  A user will never really feel a 'Real-time' experience when you use an application that uses DAQmx. Deterministic control applications almost always use an FPGA with a real-time embedded controller.

  It is possible that other delays are due to timing considerations in your code but if you checked these it may be a hardware limitation.

  If you could let me know how you do that would be great.

  Kind regards

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  The short version is I'm programming a cRIO and apparently the RT code isn't running after you deploy, and I can't understand why. It is further complicated as I do all this remote and I don't have direct access to the unit since I am 500 miles away. I work through a couple of other guys who know some LabVIEW, but neither is working on the site so that they explicitly trip there whenever I have a bright idea.

  I was there a few weeks ago. During this time, I created a code simple cRIO, since I'm new to the cRIO, allowing the user to move a control and change a chart. It worked fine, but I must stress that it did not have a FPGA component. After that, I worked on the actual code, which reads some sensors, displays the results on a user interface and stores the results. Did FPGA. I used it in the LabVIEW environment and it worked fine, but I ran out of time before I could finish a release build and deploy the RT as a compiled application. I sent them the version later, my contact deployed but had the network stream errors during execution of the user interface.

  After hours to address network problems and sending over debug versions, I tried to create a log on RT level so I could see what was going on. The journal is not yet open, even if it is the first command in the code. I have pores through the forums and found http://forums.ni.com/t5/LabVIEW/cRIO-Troubleshooting-creation-and-deployment-of-startup/td-p/1956475... which took a new direction.

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  The last thing I'm getting is that I sent her instructions for how to build a source distribution of the project that I sent and try to deploy on the cRIO. Even if it works, I'm not sure that this is an acceptable solution, because I assume running VI, rather than the EXE is slower, and they need to speed on this project.

  Simply, I don't know where to go from here. I probably need to get direct access to the cRIO and I might be able to convince them to ship to me so I can understand this point, but I don't know where I got same departure other than the Voodoo debugging standard of "trying stuff randomly until something works". I am open to suggestions, if someone managed to solve this before.

  Code snippet of the first part of the project is fixed, although I don't know how much what good it will do. I am really confused, and the customer is frustrated with how much budget is going to solve this problem.

  
  

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  I built two requests in real time; one for a PXI Chassi and the other for a compact field point. I wish I could send the customer updated versions of applications in real time and ask them to install them to the respective chassi/fieldpoint in the field. The customer is not the development environment. I looked around MAX, but could not find a way to do this.

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  Kevan-

  HI Kevan.  Take a look at replication system tools.  According to me, it appeared in 8.0 or more.

  We used the tools NOR as basis of our own tools of level end-user to exactly what you are

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• How to make the variable data record (intermittent time), with a real-time display

  I'm a complete newbie to Labview. We are currently developing a piece of hardware in the lab to automatically take the readings of the concentration of a sample, through correlations with voltage readings. I have read and worked through the getting started with Labview .pdf, but other than that my knowledge is minimal. I have a flowsheet of work who is able to do it correctly and display and write the data in real time. However, I want to be able to write to a file only every 10 minutes or so, since experiments can run for several days and the amount of data it currently logs is unnecessary.

  Would be nice if he could write it in columns like this:

  [date time]  [voltage ave]  [levels]

  xx                     xx                        xxx

  xx                     xx                        xxx

  xx                     xx                        xxx

  .. .but only once every 10 minutes. Or at any interval of time, I put.

  I tried to connect different parallel loops, but I failed miserably. I don't know if it is a relatively simple problem for you guys to help me with.

  I have attatched file. Please note that the file variables.txt is there simply to hold the settings for the correlation of concentration, which took charge of him.

  In addition, advice or tips to improve this would be greatly appreciated.

  Hi mooray.

  I took a quick look at your code, but you should be able to do something like this:

  

  When you have an Express VI elapsed time set to 600 seconds (10 minutes). If every 600 seconds time out will pass a Boolean TRUE, which will allow to write the measurement file Express VI. Therefore, what iteration of the while loop, you would write some input comes in the signal input to write it into a file position.

  There are other ways to do this as well, but it's pretty simple. I hope this helps!

  Thanks for choosing National instruments.

  Aaron P

  National Instruments

  Technical sales engineer

  http://www.NI.com/support