Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 764)

Chapter 30
Using a 9/Series Dual--Processing System
30-24
Important: These areas are measured from the machine coordinate zero
point to the extremes of the fixture encompassed by the zone when the
machine is at home. The machine coordinate system zero point and
machine home are frequently not the same point on the machine. Machine
home is a fixed mechanical position established by the homing sequence
off hardware homing switches. The machine coordinate system zero point
is established in AMP and referenced from the machine home point (see
chapter 11 for details). Refer to your system installer’s documentation for
information regarding the location of machine coordinate system zero. For
interference checking to function properly, both processes must have the
same zero point, but they can have different home locations.
CAUTION: The distance between the boundaries before a
collision is detected is dependant upon factors such as:
speed of the axes
direction of axis travel with relationship to one another
For example, a programmed collision between two axes
traveling at rapid directly towards one another may not be
detected in time to fully stop the axes before some overlap of
the interference boundary occurs. We recommend making your
boundary areas as large as possible (definitely larger than the
actual physical dimensions of the protected fixture) to allow for
this potential overlap condition.
Only two axes can be entered in an interference table (available axes are
configured in AMP). To prevent a collision, other axes must rely on
protection by this interference area, or depend on you to use extra care
when programming or manually positioning the axes to prevent a collision.