Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 208)

Running a Program
Chapter 7
Running a Program
Chapter 7
7-26
CAUTION: When a program recover is performed, the control
automatically returns the program to the beginning of the block
that was originally interrupted. The beginning of the block is
probably not the point that axis motion was interrupted. For
absolute linear moves this causes no problem if the tool is still
somewhere along the path of the block that program execution
was interrupted while cutting. In incremental or circular mode
however, if the cutting tool is still located at the point that
program execution was interrupted a restart may damage the
part. If a program recover operation is performed in
incremental mode it is important that the cutting tool be at the
location that the interrupted program block began, not the
location that the program was interrupted at.
This feature may be used to search into any subprogram or paramacro that
may be contained in the main program also.
WARNING: It is the responsibility of the system installer’s
PAL application to make sure proper activation of all necessary
machine functions has occurred before allowing a interrupted
program to continue. You should verify that all machine
functions are in the correct state before pressing <CYCLE
START>.
Important: The interrupted program recover feature will not:
send PAL nonmodal M--codes including user--defined groups 0 -- 3,
group 4, group 5, and group 6 M--codes.
on dual process systems, halt execution for synchronization codes.
read from or write paramacro variables to PAL
on dual process systems, shared paramacro variables between processes
may not be evaluated as desired depending on the status of the other
process.
send to PAL gear change requests based on spindle speed