Communicate between DAQs

Question

Hi,
This is my project in short
I am generation excitation signal using Function generator.. sending this to DAQ analog i/p.
The DAQ analog o/p gives these values out to the experiment set up.
The DAQs also takes the i/ps and o/ps of the experiment,
The vi reads these values , takes them through a controller ( feedback PID) ,
scales the excitation signal using the weighting value, 
then resends them to the DAQ analog o/p to return to controll the experiment i/p and o/p.
My problem is that there seems to be sonme communication problem between the DAQ analog i/p and analog o/p..
The analog o/p is not generating what the function generator generates.
I only have 2 DAQS. One DAQ does the analog i/p , analog o/p and reading in of the experiment i/p values (digital line).
The other DAQ does the reading in of experiment o/p values (digital lines).
I have attached the vi file...
 please , any clues??
thanks,
ruser.
Attachments:
controllerinterface.vi ‏377 KB

Answer 1

Hello Ruser,
One thing I would try is to put another waveform graph indicator on the signal going into the analog output DAQ assistant.  This will tell you whether your signal manipulation is the problem, or whether there is some miscommunication between acquisition and generation.  If you could attach a screenshot of the two excitation graphs (before and after manipulation) that will help to determine what the problem may be.
Regards,