How to go back to a previous version of NI Motion

Has anyone tried going back to an older version of NI Motion?  Specifically I loaded labview 8.5 and NI Motion 7.6 on to my computer after having run Labview 6.1 and NI Motion 5.1.1 successfully for seven year.  The newer version is not compatible with my system and will not run.  I've loaded the old system on a completely different hard drive and tried to get the system back the way it was.  My motor appears to be out of tune and will not run.  I note that both the new .xml file and the firmware files are bigger in the 7.6 version.  I've tried padding the 5.1.1 firmware files with NULL characters but that didn't help.  I suspect that some part of the new .xml file is being left on the board when I write the old one back.  Anyone know a work around?
Jim Fee

Jim,
This sounds a lot like an issue with pull-in moves.
"Pull-in: When stepper motors are run in closed-loop mode, the encoder feedback is used to
verify the position of an axis when the motion ends. The motion controller then
commands the axis to do a final move so that it is at the specified target
position."
If the number of pull-in moves is set extremely high I can see this causing what you are seeing.
Can you give me more information on your setup and when you see this oscillation. I'm assuming it is only when you tell the motor to find home.
--Michelle
Instrument Control R&D
National Instruments
Instrument Control
Machine Vision

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