Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 380)

Axis Motion
Chapter 14
14-22
Your system installer can install a switch for each of the 4 available axes.
What axes are mirrored with what switches depends on the PAL program
in your system. You can mirror about more then one axis using more then
one manual mirror image switch at the same time or one switch can control
more than one axis. Refer to documentation prepared by your system
installer for details.
Important: You can use programmable mirror image at the same time as
manual mirror image. The programmable mirror image is done first,
followed by the manual mirror image. The same axis can be mirrored by
programmable and manual mirror image at the same time.
Use this feature to disable the axis position display and allow an axis to be
clamped into position. Typically an axis clamp is performed by the
execution of an M-code in a part program or by a switch of some type
controlled by the operator. Your system installer determines how the axis
clamp feature is enabled in PAL. Refer to your system installer’s
documentation for details.
When an axis is clamped, the control freezes the axis position displays at
their position. Any drift or movement generated by some external force
does not generate any corrective response from the axis servo. This
prevents the servo from trying to move an axis back into position when it
has been mechanically clamped so it cannot move.
Any movement of the axis when it is clamped is added to the current value
of the following error. You can view this on the screen displaying
following error. Refer to the Integration manual. If the following axis
error exceeds its allowable maximum following error (set in AMP), an
error is generated and the control goes into E-Stop.
When the axis is unclamped, the control position display is reactivated and
the servo returns the axis to the necessary position for zero following error.
END OF CHAPTER
14.5
Axis Clamp