Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 779)

Chapter 30
Using a 9/Series Dual--Processing System
30-39
Coupling/Decoupling is a dual group function. All axes must be in the
dual groups default 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)