USB 6215 analog output problems with analog input and counter reading

[fug101]

Hi, I am using Labview 8.2 and trying to get one channel analog input and one counter reading, meanwhile one channel analog output based on the analog input. 

I am using USB 6215.  It seems that I can get the analog input and counter reading o.k., but could not generate any analog output at 1000Hz.

The device does not support hardware sampling so I used continuous timing and sample clock.

Here are some screen shots.  Any suggestions on how to get the analog output work?

Thanks.

Fug101

[jschwartz]

Hi Fug101,

Could you please post your code? 

[lab_boy]

Hey,

Try changing DAQmx sampling in AO to conti. instead of finite and also set your AO to non-regeneration using DAQmx property node.

cheers

-Lab

[fug101]

Code is attached.

Thanks.

[fug101]

Thanks, how to set the property node? could not find out.

Could you please show an example.

Fug101

[jschwartz]

I have attached a picture that will show you where to find the regeneration property node.

[fug101]

Jim,

Thanks.

It seems now it starts to work.  But here comes another issue.

The Analog ouput does not update in time (embedded in the while loop).

Also, when it works, there is a significant delay between the sign flip (controlling the motor direction) and the real action of motor -- about 1 second.

The question is, how do I update the AO channel instantly when the sign is flipped.

Best,

fug101