Sending multiple analog outputs to a NI 9264

[c-swanholm]

I'm running LabVIEW 2015 and trying to control two motors with analog voltage outputs through a NI 9264. I'm new to lab view and i've had no problems up until this. I can send multiple digital outputs and receive multiple analog inputs no problem but for some reason i can't get this to work.

I like the DAQ assistant so if anyone can guide me on what im doing wrong please help.

It has something to do with the array dimensions? How do I work around this.

[IanSh]

I believe to use two channels on the DAQ assistant output task, you'll need to do "Merge Signals" to put the two signals together, rather than build array.

[RavensFan]

Your DAQ Assistant is set for 2 channels, continuous samples (100 samples).

Your To DDT express VI takes a 1-D array representing a single point for 2 different channels, and converts it to the evil blue dynamic data wire (you really can't tell what the data on it represents) to a 1-D array of scalars - single channel.

What you need to do is change that to 1D array of scalars - multiple channels.

If you created a 2-D array for multiple channels, and multiple samples, you'd use 2D array of scalars - columns are channels.  (If that didn't work, then use "rows are channels")

[Gregory]

Duplicate post here

[c-swanholm]

When you merge the signals i get a buffer size error

Generation cannot be started, because the selected buffer size is too small.

Increase the buffer size.

Selected Buffer Size: 1
Minimum Required Buffer Size: 2

Task Name: _unnamedTask<39A>

[c-swanholm]

how do i change it to mulitple channels or make it a 2d array.

[Gregory]

If you just want to set a constant value, you probably want to change your generation mode to "1 sample"

If you want to send a time-varying signal, you can use waveforms. Use quickdrop (ctrl + space) to find "Build Waveform" which has inputs for dt (period = 1 / sample frequency) and for 1D array Y. If you're writing 100 samples then Y should have a length of 100. You create 1 waveform for each channel, then build them into an array.

[c-swanholm]

i dont know if that is what i want. I'm trying to use an analog voltage to control 2 motors simultaniously