lexmotion PCI-7344 with LabView for use as a Parabolic Antenna controller. The Problem is feedback from each axis (AZ & EL). Each axis uses 2 Synchro's (1:1 & 36:1 for Course & Fine 90V / 60Hz) for feedback. I have no choice in using synchro's as feedback.In our normal system, we use 16 or 12 bit S/D converters. This is then looked at via very custom software and the target position is derived from it. The corresponding position is then sent through a D/A converter and output to a servo amp. I thought I could feed the Syncho outputs to a S/D converter, then to a D/A converter, then into the analog inputs of the PCI-7344. The problem I run into is that the D/A's (12 bit) see 1000|0000|0000 as 0 volts output. The S/D converters, when the
antenna is at physical 0 degree's, output 0000|0000|0000. If I'm correct, I need 0 volts input to the PCI-7344 to indicate I'm at 0 degree's. I've tried playing with the bits between the S/D and the D/A with no success. This therefore led to my last question I posted. Can I feed the output of the S/D's to the digital lines of the PCI-7344 and use it as feedback? I also am trying to figure out a way of letting the controller know what sector I'm in - CW or CCW. I have a cablewrap voltage as a possible feedback for this. +/-15Vdc depending what sector the antennas in. The antenna must be able to physically track in a possible pattern starting at -90 degrees, through zero degree area, up to 90 degrees or vice/versa. Right now I would be happy with the controller to be able to position the antenna to a count which corresponds to actual position. If anyone has any idea's, they would be greatly appreciated!!!! I hope this awnsers some of your questions Yellowjacket. If you see a solut
ion that I didn't mention feel free to let me know.
