[SDK BuildAndDownload]

To get it to work, I had to remove all spaces from my project path

[why Q variables often switch between 0 and the specified value？]

I doubt that this is what you are dealing with but, I would make sure that I68 "Coordinate System Activation Control" is set to 0. regardless of how many coordinate systems you are using; PMAC allocates the Q variables according to I68.

 

Also note: that P variables P0-32 and P101-132 can be special purpose variables also.

 

Also note that some values may dither in PEWIN due to an occasional corrupted communication.