Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 344)

Chapter 12
Overtravels and Programmable Zones
12-6
Important: When made active the current tool location must be outside of
the area defined by programmable zone 2.
G22 programmable zone 2 and 3 active
G23 programmable zone 2 and 3 inactive
G23 is normally automatically made active at power up though this is
determined by the system installer in AMP. Any zone that is activated in a
program or MDI block, remains active even after a control reset, E- STOP
reset, or end of program block (M02 or M30).
Important: If programming a G22, any axis words included in the block
will be stored as the coordinates for programmable zone 3 (see section
12.5).
If an attempt is made to designate some other command in a G22 or G23
block, other than a G code in the same modal group, for example:
G22 G01 X12.;
the control issues the error message:
“UNUSABLE WORDS IN ZONE BLOCK”
Figure 12.5
Programmable Zone 2
The tool (as defined by its active offset) is
prohibited from entering Programmable Zone 2
Programmable
Zone 2 Cutting
tool
Software
overtravel