Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 794)

Chapter 30
Using a 9/Series Dual--processing System
30-26
Your system installer can configure an axis to be shared by different
processes. With this feature multiple processes can execute part program
commands or perform manual operations on the same shared axis.
A shared axis can not be commanded by more than one process
simultaneously. Control of the shared axis must be changed from process
to process thru the system installer’s PAL program.
Shared axes are shown on the position display in the order your system
installer defines them in AMP. Shared axes are displayed only for the
process that currently has control of the shared axis (except on graphics
and axis monitor screens). When control of the shared axis is changed to a
different process, the axis is removed from the position display and added
to the new controlling process.
You can select to plot a shared axis for display on one of the graphics
screens regardless of the process currently controlling the shared axis. The
machine info window on graphics screen always shows only the axes
currently assigned to that process.
Homing a Shared Axis
A shared axis is homed like any other axis. It must be homed before it can
be positioned by a part program block. Home the shared axis in the
process that it is currently assigned. There is only one home position for a
shared axis (this position is independent of the current process). Once a
shared axis is homed in one process it becomes homed in any additional
processes as well. You do not need to home the shared axis in each
process.
Programmable Zones
Each process contains two independent programmable zones. Zones are
checked on a per process basis. The system installer can setup shared axis
zone values in AMP. A shared axis has the same zone values in both
processes. Shared axis zone values can be manually entered in either
process through the zone configuration table (see chapter 3 for details).
Zone 3 values can be changed in the part program as discussed in chapter
12. Each process can have a separate programmed value for for a shared
axis in zone 3 however these programmed values are only temporary and
do not overwrite the original AMP or manually entered table values.
Shared axis values in a programmable zone are monitored only in the
process currently controlling the shared axis. Shared axes are no longer
part of a programmable zone once they leave the process. Zones defined
to contain shared axes can be enabled and disabled in any process
regardless of the process currently controlling the shared axis. If a zone is
activated without a shared axis member, the shared axis zone values are
ignored for that process until the shared axis is switched into that process.
30.6
Shared Axes on
Dual- processing Systems
30.6.1
Operating a Shared Axis