Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 145)

Zone/Overtravel Parameters
Chapter 6
6-19
Function
Use this parameter to specify the number of interference checking zones
available. The number of zones available should be equal to the number of
tool stations available on the machine.
Axis Parameter Number
Process 1 Process 2
All [20223] [21223]
Range
1 to 32
Notes
This is a per process parameter. The value set here applies to all axes
assigned to that process.
END OF CHAPTER
6.3.4
Maximum Interference
Check Zones