Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 651)

Miscellaneous Parameters
Chapter 37
37-11
Function
Use this parameter to determine if the control resets to the default work
coordinate system when an end-of-program (M02 or M30) block is read.
Yes -- Setting a value of Yes for this parameter causes the control to cancel
all coordinate system offsets that may be active except the “External
offset” (as if a G92.1 was executed). This also re-activates the work
coordinate system that is set as the default work coordinate system using
the parameter called “PTO Work Coordinate” discussed in chapter 13.
When the end of program code is read by the control, the active coordinate
system becomes either G54-G59 or none as set using the PTO Work
Coordinate parameter plus any “External offset” value that has been
entered on the control.
No -- Setting a value of No for this parameter causes the control to keep the
currently active work coordinate system and its active offsets active. M02
and M30 do not have any effect on the coordinate system. The next
program that is executed adopts the coordinate system with its offsets.
Axis Parameter
Number
All [84]
Range
Selection Result
(a) Yes
(b) No
Notes
This is a global parameter; the value set here applies to all axes
and processes.
Important: Setting a value of No for this parameter may cause undesired
results if the program being executed contains a G52 coordinate offset. If
this is the case, the coordinate system gets offset by the incremental
amount in the G52 block each time the program gets executed. This
problem does not occur when a G92 offset is programmed, since this offset
absorbs any other active G92 offset. We recommend that if a G52 offset is
used in the program, it be cancelled before the M02 or M30 program block
using a G92.1 code.
37.11
Reset Coord Offset on
M02/M30