Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 207)

Running a Program
Chapter 7
7-25
Use the program recover feature to resume a program that was executing
and was interrupted by some means such as a control reset, E-STOP, or
even power failure in some cases. This feature will scan the program as it
searches for the interrupted block and from within the search area:
send to PAL the last programmed modal G--codes from each modal
group.
send to PAL the last programmed modal M--codes from each modal
group and set its associated PAL strobe (non--modal codes including
user--defined M--codes are not sent to PAL).
send to PAL the last programmed T code and set its associated PAL
strobe
send to PAL the last programmed auxiliary function code (B--word) and
set its associated PAL strobe
send to PAL the last programmed spindle commanded speed and set its
associated PAL strobe
resolve paramacro equations and assign paramacro variable values (note
on dual process systems shared paramacro variables can be different
than expected depending on the state of the part program in the other
process, also equations that use PAL paramacro variables may also
evaluate differently since no paramacro interaction with PAL occurs
during a search operation).
establishes any work coordinate system, including all offsets and
rotations to the work coordinate system.
Important: Incremental moves that occur during a interrupted program
recover operation, are always referenced from the last known absolute
position in the part program. If no absolute position is specified in the
searched part program blocks, the control will use the current axis position
as the start point for incremental moves.
Unless Cutter Compensation is active, when a program recover is
performed, the control automatically returns the program to the beginning
of the block that was interrupted. In the case of power failure, the control
will even reselect the program that was active prior to the interruption.
7.8
Interrupted Program
Recover {RESTRT
PRGRAM}