Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 134)

Zone/Overtravel Parameters
Chapter 6
6-8
Function
There are 3 programmable zone groups for the programmable zones (see
the parameter Programmable Zone Group). By assigning an axis to a
group, that axis is checked simultaneously with any other axes in
that group.
This parameter tells the system how many zone groups that the machine
has to check. The axes are assigned to these groups by using the parameter
Programmable Zone Group.
If zero is selected for this parameter, it indicates to the control that there
are no programmable zone groups, and the programmable zone feature
is disabled.
Axis Parameter Number
Single Process Process 1 Process 2
All [20] [20020] [21020]
Range
0 to 3
Notes
This parameter is global; the value set here applies to all axes.
On Dual Processing controls, this is a per process parameter. The value set
in the parameters applies to all of the axes assigned to that process. For
zones with shared axes (one axis in both processes), you need to configure
the group for each process that checks the shared axis in a zone.
6.1.2
Number of Limit 2, 3 Groups