Can I generate sine and square waves with NI PCI-MIO-16XE-50 card??

Can I generate sine and square waves with NI PCI-MIO-16XE-50 card??
How Do I generate those signals?

Hello;
You certainly can do that. The way to go about that is to use one of the Analog Output channels your board have available.
If you are using Labview to program the board, you can find good examples at Search Examples->I/O Interfaces->Data Acquisition->Analog Output->Multiple Point (buffered) Analog Output.
If you are using other Software language to program the board, you can fing examples at C:\Program Files\National Instruments\NI-DAQ\example\VisualC\AO.
Hope this helps.
Filipe

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How to do a single channel DAQ using NI-DAQ driver software with a PCI-MIO-16XE-10 card

Hi,
I would like to find out how I could do a simple one channel Data Acquisition from a signal generator using the NI-DAQ driver software with a PCI-MIO-16XE-10 card.
I have written some test problem but even when the signal generator is turned on/off I get back some weird values.
Here is my code.
CString sFunctionName("");
double volt[OUTPUT_POINTS*2];
double out[OUTPUT_POINTS*2];
short timebase, ready, code, stopped;
unsigned short sampleInterval;
int i, status, count=0;
unsigned long update, points;
short* ai_buffer;
short output_ch_vector[16];
int local_ITERATIONS = 2;
SAFEARRAYBOUND bound[1];
double dataItem = 9.9;
long j;
long k;
double* pTheValues;
LPTSTR lpsz_ErrMsg;
// Initialise device
status = Init_DA_Brds (deviceNumber, deviceNumberCode)
Initializes the hardware and software states of a National Instruments
DAQ device to its default state and returns a numeric device code that
corresponds to the type of device initialized
Init_DA_Brds(DEVICE, &code);
// Check return code from Init_DA_Brds
Code return should be 204: PCI-MIO-16XE-10.
if (code < 0)
CString sError;
sError.Format("Code error: %d", code);
if (code == -1)
sError = sError + ": No device found";
LPTSTR lpsz = new TCHAR[sError.GetLength()+1];
_tcscpy(lpsz, sError);
AfxMessageBox(lpsz);
delete lpsz;
return S_FALSE;
// Allocate memory for analog output and input arrays
//ao_buffer = new short[OUTPUT_POINTS*2];
ai_buffer = new short[OUTPUT_POINTS];
// Set double-buffering
status = DAQ_DB_Config (deviceNumber, DBmode)
Enables or disables double-buffered DAQ operations.
status = DAQ_DB_Config(DEVICE, 1);
if (status < 0 )
sFunctionName = "DAQ_DB_Config";
goto TidyUp;
// Get the rate parameters
status = DAQ_Rate (rate, units, timebase, sampleInterval)
Converts a DAQ rate into the timebase and sample-interval
values needed to produce the rate you want.
status = DAQ_Rate(RATE, 0, &timebase, &sampleInterval);
if (status < 0 )
sFunctionName = "DAQ_Rate";
goto TidyUp;
// Setup scan
status = SCAN_Setup (deviceNumber, numChans, chanVector, gainVector)
Initializes circuitry for a scanned data acquisition operation.
Initialization includes storing a table of the channel sequence
and gain setting for each channel to be digitized
status = SCAN_Setup(DEVICE, 1, ai_channels, gain);
if (status < 0 )
sFunctionName = "SCAN_Setup";
goto TidyUp;
status = SCAN_Start (deviceNumber, buffer, count, sampTimebase,
sampInterval, scanTimebase, scanInterval)
Initiates a multiple-channel scanned data acquisition operation,
with or without interval scanning, and stores its input in an array
status = SCAN_Start(DEVICE, ai_buffer, OUTPUT_POINTS, timebase, sampleInterval, timebase, 1000);
if (status < 0 )
sFunctionName = "SCAN_Start";
goto TidyUp;
while(count < local_ITERATIONS)
// Check whether we are ready to input another half-buffer
status = DAQ_DB_HalfReady(DEVICE, &ready, &stopped);
if (status < 0 )
sFunctionName = "DAQ_DB_HalfReady";
goto TidyUp;
if (ready == 1)
status = DAQ_DB_Transfer(DEVICE, ai_buffer, &points, &stopped);
if (status < 0 )
sFunctionName = "DAQ_DB_Transfer";
goto TidyUp;
count++;
// Clear the analog input
status = DAQ_Clear (deviceNumber)
Cancels the current DAQ operation
(both single-channel and multiple-channel scanned) and reinitializes the DAQ circuitry.
status = DAQ_Clear(DEVICE);
if (status < 0 )
sFunctionName = "DAQ_Clear";
goto TidyUp;
status = SCAN_Demux (buffer, count, numChans, numMuxBrds)
Rearranges, or demultiplexes, data acquired by a SCAN operation
into row-major order, that is, each row of the array holding the
data corresponds to a scanned channel
status = SCAN_Demux(ai_buffer, OUTPUT_POINTS * 2, 2, 0);
if (status < 0 )
sFunctionName = "SCAN_Demux";
goto TidyUp;
//Convert binary values to voltages (Doesn't actually take a reading from board)
status = DAQ_VScale (deviceNumber, chan, gain, gainAdjust, offset, count, binArray, voltArray)
Converts the values of an array of acquired binary data and the gain setting for that data
to actual input voltages measured.
status = DAQ_VScale (1, 0, 1, 1.0, 0.0, OUTPUT_POINTS , ai_buffer, volt);
if (status < 0 )
sFunctionName = "DAQ_VScale";
goto TidyUp;

Hello,
Please take a look at lots of examples available at :
1. www.ni.com >> NI Developer Zone >> Development Library >> Measurement Hardware
2. C:\program files\national instruments\ni-daq\examples\visualc
Sincerely,
Sastry V.
Applications Engineer
National Instruments

Configuring executable labview programs originally configured with a PCI-MIO-16XE-10 on a system with a PCI-MIO-16XE-50 card

I'm hoping someone can help me. I have executable labview programs created in another lab which used a PCI-MIO-16XE-10 card. I need to install these programs in a new lab which has a PCI-MIO-16XE-50 card installed. When downloading the executable files, Measurement and Automation Explorer gave a message that the physical devices could not be located. I presume this is because the executables are configured for the PCI-MIO-16XE-10 but the PCI-MIO-16XE-50 is installed instead. Any suggestions on how to get these programs configured with the PCI-MIO-16XE-50 would be greatly appreciated? Thanks.

As long as you have the device identifier of the PCI-MIO-16XE-50 set the same as the PCI-MIO-16XE-10 for which the program was written, you shouldn't have a problem doing what you describe.
One thing that confused me about your posting, however, is the statement When downloading the executable files, Measurement and Automation Explorer gave a message that the physical devices could not be located. This doesn't make sense to me. You're getting an error from MAX when downloading your program? MAX shouldn't be involved at all here, and especially not when just downloading your program. If you can provide more details about exactly what you are doing (maybe post some screenshots) then I'm sure we can help you get your program working.
Good luck,
Joe

Simultaneous sampling with a PCI-MIO-16XE-10 board

Hello,
I am using LabView with a PCI-MIO-16XE-10 board. I would like to make simultaneous sampling in multi channels. How can I do?
Thank you for your help.

Your question should be posted under "Measurement Devices >> Multifunction I/O" instead of "Real-Time DAQ" because the PCI-MIO-16XE-10 board is not a real-time device. The category "Real-Time DAQ" is reserved for 7030 real-time devices.
The PCI-MIO-16XE-10 multiplexes channels across one amp and one A/D converter; therefore, it cannot perform true simultaneous sampling. Consider using the SC-2040 accessory, which has 8 simultaneously sampling differential amplifiers. Alternately, you can purchase a different board like the PCI-6110, which can perform true simultaneous sampling because it has individual A/D converters and amps for each channel.

Replacing an AT-MIO-16X with a PCI-MIO-16XE

Updating an old system we upgrade DAQ card with one we tough was "all" identical, but I found that the DIO port is not. In fact the MIO-16X can be define as an 4 bits port but not the new card PCI-MIO-16XE-10. Unfortunately the Vi we are using was design with the 4 bits capability (4: Input, 4 Output). To minimize the modification of the software any suggestion...

Hello;
You didn't mention what Software language is being used to program the board, but, the best way to go about that is to mask the port, so you can have 4 bits working as input or output.
If you mask the port, you can still use your code as the port was a 4 bit port.
Hope this helps.
Filipe

I get error code 200324 with my PCI-MIO-16E-1 card

I use Labview 7 and my A/D card was working until last week. Now I hardly find a PCI slot at my PC that the card doesn't crash my PC, and when I do I get this errod code 20034 from the measurement and automation explorer.
I have tried mounting the card at other pci slots, it didn't work.
the services nidevldu and nipxirmu are running - checked.
Any ideas that could help me?
Regards
Christos
Attachments:
Error200324.bmp ‏2305 KB

Christos,
Aside from the services that you have already checked and they're running, another common cause of this error is needing to reset the DAQ device. After running an example in Traditional NI-DAQ, the board needs to be reset before running an NI-DAQmx example. In MAX, expand Devices and Interfaces. Then right-click on Traditional NI-DAQ Devices and select Reset driver for Traditional NI-DAQ. Hopefully, you will now be able to use the board with NI-DAQmx. Hope this helps. Have a great day!

Generating square wave with variable duty cycle

We like to generate a square wave with variable duty cycle using LabView 6.1 and SCB-68 and this duty cycle comes from some PID controller programmed by LabView by reading a voltage and feeding back this square wave

the story begins with some one called separately excited DC motor
this thing sometimes changes its speed
so we are trying to keep a constant speed
irrespective of the load no matter how it changes
this comes by reading the voltage out from
the tackometer which represents the speed as voltage
then comparing this with a reference set by the labview program
the labview program will send a control signal to some chopper circuit
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we are tending to make the labview program as pid controller
that will generate our beatiful square wave with some duty cycle
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Problem integrating PCI-MIO-16XE-50 and AMUX-64 T multiplexer

I can test the PCI-MIO-16XE-50 card in MAX but i can not test the virtual channels

Hey Hiral,
The AMUX-64T does not support virtual channels. You'll need to acquire the data and then perform the required scaling in software. The following document discusses how to access the appropriate channels.
How do I Address an AMUX-64T with an MIO Board?
This next document may also be useful. It discusses how to perform the necessary scaling for a thermocouple channel in LabVIEW.
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National Instruments

How to apply single sine or square wave

Now I used NI-FGEN and NI-Scope for bender element test, I want to now how to generate single sine or square wave (normally in NI-FGEN, I saw only continuous wave generation type).thanks you so much

If I understand your question correctly, it sounds like you would like to output one period of a sine wave or square wave and then just 0V DC. To do this you can use the niFgen_Basic_Arb_Sequence_Example. You will want your first sequence to be a sine (or square) wave and then the second sequence to be DC with an amplitude of 0V. You could replace the while loop in that example with a sequence structure with a wait in the structure to last just a bit longer than your sine wave. This will ensure that your sequence doesn't repeat.
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Regards,
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FFT on triangular and square waves.

Hi,
I have been computing FFTs on a some sinusoidal waves and have been doing fine, gett the right Y axis values in the units Vrms^2. For example a 10V amplitude (20v peak to peak) wave at 100 htz would give a peak at 100 htz and 49Vrms^2 since the RMS value fo 10 is 7 and 7^2 is 49. Now when I input a Square wave with the same characteristics I no longer get the same scaling instead getting a peak at a higher y value. With a triangular wave I get peaks at lower values. Can anyone explain to me why this is happening?
Thanks.
Intern NSWCCD Carderock.

Actually RMS (Root Mean Square) value of periodic signal f(t) is defined as a square root of squared signal averaged over the period T, mathematically:
f_rms = sqrt ( aver (f^2) ),
where aver (f^2) = [integral of f^2 over the period T] / T
It is easy to show that for pure sine wave f(t) = A*sin(2*pi*t / T), f_rms = A / sqrt(2) ~ 0.707*A – this is well-known result anyone can find in almost every textbook. It is not difficult to calculate exact value of f_rms for square and triangular waves. Results are as follows:
f_rms (square) = A, where square wave f(t) = A, if 0<t<c*T and f(t) = -A, if c*T<t<T (here 0<c<1 and c=0.5 for 50% duty cycle wave)
and
f_rms (triangle) = A / srqt(3) ~ 0.577*A, where I assumed triangle wave that raises from 0 to +A over 0 < t <T/4, goes down to –A over T/4 < t < 3T/4 and returns to ZERO in the last quarter of the period T
Parseval’s theorem (http://en.wikipedia.org/wiki/Parseval's_theorem) of Fourier analysis states that energy of periodic signal (=integral of f^2 over the period T) must equal to energy of its Fourier transform ( sum of squared amplitude of all harmonics for periodic signal). That’s why Fourier analysis in Labview is capable of producing signal’s RMS value in addition to its spectrum.
Now, main harmonic of square and triangular waves carries majority of signal energy, but not all of it because of presence of other harmonics. That means that amplitude of main harmonic as reported by Labview will be close to but slightly less than signal’s RMS value. This explains the results you reported in your very first post.

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Can I generate sine and square waves with NI PCI-MIO-16XE-50 card??

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