Played with a program just to linear move the z axis. Start mach. Reference axis. Home axis. All work fine. Set my Z zero at -2.00" (actual Position)
program linear move
Z .5" F5
Z 0.0 F5
Used mode select 2 Single Event and 1st move Z travels up in + direction until it faults on high limit.
Rewrote program to start
Z +.5" F5 and using Single Event, same thing. Z travels up until it faults.
The readout on the screen is indicating the + movement.