Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 418)

Axis Motion
Chapter 14
14-42
Special Considerations
Feature: Consideration:
Control Reset If a control reset operation is performed while the control is
against a hard stop the holding torque is released and the axis
is taken out of the hard stop state.
Block Reset If a block reset is performed during a G24 block before the
hard stop has been reached, the torque limits applied to that
axis are removed and the G24 block is aborted.
Program Checking Feed to hard stop blocks are executed as normal G01 moves
while in QuickCheck.
While in dry run the control will not execute G24 feed to hard
stop blocks at rapid. Feed to hard stop blocks are executed at
the programmed feedrate during dry run and all the axis torque
restrictions are applied (dry run is ignored during the G24
block).
Deskew and
Dual Axes Only one servo can be fed to a hard stop. This restriction
makes programming a G24 code for either a Deskew axis or
Dual Axes invalid.
Probing You can not use probing with the feed to hard stop feature
because a probe G-code and a hard-stop G-code cannot be
programmed in the same block. The probe must be unarmed
when the G24 block is executed, and when the axis is removed
from the hard stop. You can however perform probing while
the axis is parked against the hard stop.
Block Retrace You can not retrace any block that moves an axis off of a hard
stop. This is because the start point of that move is
determined by the hard stop which can only be safely reached
by executing a G24 block. You can retrace a G24 block as
long as the axis is still against the hard stop when the retrace
operation begins. You cannot retrace through programmable
acc/dec blocks (G47.x and G48.x). However, you can retrace
through blocks where programmable acc/dec was already
active.
Interrupt Programs You can execute an interrupt program during a G24 block
provided you are not performing a type 1 interrupt (type 1
interrupts are incompatible with the hard stop feature). You
can not move an axis that is currently holding against a hard
stop using an interrupt macro.
You can not execute a G24 block within an interrupt macro.
Exact Stop Mode
(G61) The G61 (exact stop mode) does not function on G24 blocks.
G61 mode is ignored when a G24 is executed.
Polar Programming
(G16) You can not program a G24 block if the axis you are
programming against the hard stop is in the current plane and
the control is in polar programming mode.
END OF CHAPTER