Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 800)

Chapter 30
Using a 9/Series Dual--processing System
30-32
A dual axis group is assigned in AMP to a specific process. All axes in the
dual group must be configured to be part of the dual axis group and must
be AMPed to be in the same process (called the default process for the
group). Dual axes can only exist as a dual group in their respective default
process. You can not share a dual group as an axis with another process.
You can only share the independent members of the dual group with
another process once the group is decoupled.
Coupling/Decoupling allows all axes in a dual axis group to be either:
- coupled as a dual axis group
- decoupled so each axis in the dual group can be programmed as an
independent axis.
Coupling/Decoupling is a dual group function. All axes must be in the
dual groups process before they can be either coupled or decoupled. When
a coupling or decoupling occurs a re-setup occurs of any part program
blocks read into the controls block look ahead buffer. This may causes a
slight hesitation in program execution while the control sets up the new
look ahead buffer.
The system installer uses PAL to determine how a dual axis group is
decoupled. Refer to your system installer’s documentation for details.
Coupling/Decoupling of the axes can only occur when all axes in the dual
group are not moving (including jogs or part programming, etc...) and are
in the AMP default process for that dual group. If a coupling/decoupling is
attempted during part program execution it occurs between blocks when
interpolation is completed.
Once decoupled the axis park feature that is normally available to the
individual axes of a dual axis group is no longer available. Axes can be
parked only when the dual axis group is coupled.
To change the process of a shared axis member of a dual group, you must
first decouple the dual axis group because couple/decouple is a group
function. When a dual group is decoupled, the axes in the group behave
like completely independent axes. Each dual group member get its own
AMP assigned axis name.
Before a request to decouple a dual axis is performed, the process
controlling the dual group must be in one of the following states:
- E-STOP
- Cycle Stop (not cycle suspend)
- Manual mode with the shared axis not being positioned
- Executing an M99 in a main program
- Postlude State (established through PAL)
30.7.1
Decoupling a
Dual Axis Group