Rockwell Automation GMLC Reference Manual - Manual (Page 237)

Publication GMLC-5.2 - November 1999
200 Motion Blocks
• Axis_status = 0 (Locked)
• Lock_status = 1 (Locked)
See the Axis Locked and Axis Done Conditions chapter in this manual for
more information. See the System Variables, chapter in this manual for
information on variables.
Absolute Moves
When you select Absolute in the Move field, the axis moves to the
specified position at the specified speed, using the specified acceleration
and deceleration.
Changing the Endpoint of Absolute Moves
You can change the endpoint of an absolute move while the move is in
progress using another Move Axis block with a new absolute position.
You can do this with any of the three velocity profiles (trapezoidal, S-
curve or parabolic) except when the axis is accelerating or decelerating.
You cannot use S-curve or parabolic profiles.
You can also change the endpoint of an absolute move using an
incremental Move Axis block while the absolute move is in progress. In
this case, the final destination of the axis is the original absolute position,
plus the new incremental distance (see Incremental Moves in this
chapter).
In all cases, the axis moves smoothly to the new endpoint without
stopping at the old endpoint—including any required change of direction.
You can change the move speed of a trapezoidal absolute move in
progress, and change the endpoint, by specifying a new speed in addition
to the new position. If new acceleration and deceleration values are
specified, they take effect only if, and when the axis reverses direction.