Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 617)

Angled Wheel Parameters
Chapter 35
35-5
Notes
When the control enters angled-wheel mode (G16.3 or G16.4) this axis and
the Wheel Axial Axis Name parameter are used to define the active plane.
This virtual axis does not require any additional axis configuration. Items
such as programming resolution, maximum cutting feedrate, etc. are all
determined by the wheel axis (W) and axial axis (Z) configurations.
Once selected the wheel virtual axis will appear on the control only when
the control is in G16.3 or G16.4 mode. All offset tables will have a virtual
axis value. The virtual axis does not have software overtravels or
programmable zone checking. All software overtravel and programmable
zone checking is performed on the axial and wheel axis.
PAL functions for the virtual axis are performed on the next logical axis
after the last AMP configured axis (this does not include spindles). For
example if your system consists of three real linear axes and a spindle,
PAL would reference the virtual axis as logical axis 4 (XXXX03 or
XXXX.03).
Paramacro system variables are also available for the virtual axis. These
are also referenced as the next logical axis after the last AMP configured
axis (not including spindles). For example if your system consists of three
real linear axes and a spindle, paramacros would reference the virtual axis
as logical axis 4 (for example #5084).
This is a global parameter. The value set here applies to all axes.