motion problem lab view 7.1

[Dan C.]

I receintly upgraded from lab view 6.1 to 7.1. I have been using the VI to collect for the past year or so with no problems, but now 7.1 will not move the stepper motors. I have a 7344 motion board and have upgraded the firmware on it as well. I can control the motors in motion assistant, but when the program reads the cordinates from a text file, they are read in, but no motion. They steps also change in the motion assistant, but still no movement. I was wondering if anyone knew of a possible problem between the 7344 and lab view 7.1 or something else that might be causing this error. Thanks, Dan

[Jenia_K]

Hi,
Try to invert pulses polarity that are going to the motor driver.

Best Regards.

[MarcoPolo5]

Dan,

The PCI-7344 works great with LabVIEW 7.1 and there shouldn't be any problems from upgrading. For troubleshooting issues like this, I always try to narrow down where the problem is by testing the hardware first, then software, then code.

For the hardware, I would check to see if the motion controller is outputting steps correctly by using the 1D Interactive page under your motion controller device in Measurement and Automation Explorer.

If everything is working there, then try running one of the simple LabVIEW motion examples to test if LabVIEW is communicating properly with the hardware:

C:\Program Files\National Instruments\LabVIEW 7.1\examples\Motion\FlexMotion\One Axis.llb (open the Simple One-Axis Move.vi from the llb file).

If a simple LabVIEW motion program is able to run, then there must be some vi in your code that is not responding properly.

Also, there is an update available for Motion Assistant - however, this just adds a few more features, and I don't think this is where the problem would be.

I hope this helps narrow down where the problem might be occurring.