Simulate device

[franky71]

Hallo,

is it possible to simulate devices with LabWin/CVI for my application (without hardware) on my PC?

LabWindows /CVI Ver 7.1.1

Unfortunately sometimes the hardware is outside at the customer and he wants to have some changes.

thanks.

franky71

[WM_John_Weeks]

With NI-DAQmx you can define simulated devices in MAX. If your programs built in LabWindows /CVI uses DAQmx calls, the simulated devices can be used just as if they are hardware (with funky timing and no hardware outputs, of course).

[franky71]

Sorry, I don't understand it clearly in MAX

For example,  what I have to do, to simulate a PCI-6221.

thank you

franky

[franky71]

now I found some to simulate PCI6221

But there are still errors in LabWin/CVI :

 NON-FATAL RUN-TIME ERROR:   "mess.c", line 86, col 23, thread id 0x00000708:   Function DAQmxReadAnalogF64: (return value == -89120 [0xfffea3e0]). Source terminal to be routed could not be found on the device.  Make sure the terminal name is valid for the specified device. Refer to Measurement & Automation Explorer for valid terminal names. Property: DAQmx_SampClk_Src Property: DAQmx_SampClk_ActiveEdge Source Device: Dev1 Source Terminal: Dev1/ai0 Channel Name: Dev1/ai0  Task Name: Dickemessung 1  Status Code: -89120

It happens, when Read or when starttasked.

I created and configerd my task on this way.

  strcpy (chan,"Dev1/ai0");
  /*********************************************/
  /*/ DAQmx Configure Code
  /*********************************************/
  DAQmxErrChk (DAQmxCreateTask("Dickemessung 1",&taskHandleA1));
  DAQmxErrChk (DAQmxCreateAICurrentChan (taskHandleA1, chan, "", DAQmx_Val_Cfg_Default, 0.004,0.020, DAQmx_Val_Amps, DAQmx_Val_External, 499.0, ""));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleA1,chan,1000.0,DAQmx_Val_Falling,DAQmx_Val_FiniteSamps,1000));        
  /*********************************************/
  /*/ DAQmx Start Code
  /* Start über digitales Signal aus der SPS, sobald Kachel unter Sensor
  /* (Analoger Trigger gibt Fehlermeldung)
  /*********************************************/
  //DAQmxErrChk ( DAQmxCfgDigEdgeStartTrig (taskHandleA1, "Startsignal",DAQmx_Val_Rising));

  DAQmxErrChk (DAQmxStartTask (taskHandleA1));

May be I made something wrong, or is it specially a problem of the simulation ?

Greets from good old germany

franky71

[Carsten_Sprung]

Hi Franky71,

i tested your code and recieved the same error. I have created a new c file with a simulated 6221. It is based on the DAQAssisstant and it works fine.
I have made some screenshots while i created the simulated device. I hope that will answer your question.

Regards,

Carsten Sprung
NI Germany

#include <utility.h>
#include <dataacq.h>
#include <ansi_c.h>
#include <NIDAQmx.h>

#define DAQmxErrChk(functionCall) {DAQmxError = (functionCall);  {if (DAQmxError < 0){goto Error;}}}

int main (int argc, char *argv[])
{
    TaskHandle task0 = 0;
    int32 DAQmxError = DAQmxSuccess;
    TaskHandle taskOut;
   
    if (InitCVIRTE (0, argv, 0) == 0)
        return -1;    /* out of memory */

        DAQmxErrChk(DAQmxCreateTask("DAQTaskInProject", &taskOut));

        DAQmxErrChk(DAQmxCreateAICurrentChan(taskOut, "Dev2/ai0","Strom", DAQmx_Val_RSE, 0.004, 0.02,DAQmx_Val_Amps, DAQmx_Val_External, 499, ""));   

        DAQmxErrChk(DAQmxCfgSampClkTiming(taskOut, "",1000, DAQmx_Val_Rising,DAQmx_Val_FiniteSamps, 1000));

        DAQmxErrChk(DAQmxCfgDigEdgeStartTrig(taskOut, "PFI0", DAQmx_Val_Rising));

  

        Error:
        return DAQmxError;
            
        DAQmxStartTask (task0);
         
        /* Place here the code to acquire the data */
       
        DAQmxStopTask (task0);
           
        DAQmxClearTask(task0);
           
        return 0;
}

[franky71]

Hi Carsten,

thank you very much for your help, especially the screenshots.

The lines above I got from an NI-Example, little bit modifying. As I see, this function helps too:

DAQmxSetTimingAttribute (taskHandleA1, DAQmx_SampClk_Rate, 1000.0)

bye