Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 338)

Coordinate System Offsets
Chapter 11
11-22
The system installer has the option of activating, deactivating, or altering
the value of the following offsets through PAL:
Work coordinate systems
External offset
Tool length offsets (geometry and wear)
Tool diameter offsets (geometry and wear)
These offsets may be modified through a PAL display page created by the
system installer or through some other input to PAL.
Be aware that there may be an impact to the activation of offsets if a part
program is already active for automatic execution. Typically any blocks
that have been read into the controls look ahead buffer (see section 21.6.8)
will be re-setup and use the newly modified offset value. However if a
cutter compensation offset has been modified by PAL, be aware that the
control will not update the look ahead buffer unless the offset is currently
active. Refer to documentation supplied by the system installer for details
on specific PAL offset operations.
END OF CHAPTER
11.5
PAL Offsets