Rockwell Automation GMLC Reference Manual - Manual (Page 243)

Publication GMLC-5.2 - November 1999
206 Motion Blocks
Rotary Positive Moves
Use the Rotary Positive Move to move a rotary Axis to the desired
absolute position in the positive direction. It is a special type of absolute
move available only for rotary axes.
When you select Rotary Positive, the axis moves to the specified position
at the specified speed (using the specified acceleration and deceleration)
in the positive direction, regardless of the current position of the axis. The
position must be a positive value less than the unwind value. Therefore
moves of more than one revolution (that is, more than 360 degrees)
cannot be performed with a single rotary positive Move Axis block.
For a rotary positive move the axis moves to the specified endpoint
position—through 0° if necessary—in the positive direction regardless of
the current axis position. Use the rotary positive move only while the axis
is not moving, to ensure motion in the proper direction.
Rotary Negative Moves
Select Rotary Negative to move a rotary axis to the desired absolute
position in the negative direction. It is a special type of absolute move
available only for rotary axes.
!
ATTENTION: Use Rotary Positive moves only on
rotary axes, and never on linear axes.
!
ATTENTION: Use Rotary Negative moves only on
rotary axes, and never on linear axes.