Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 680)

Skip, Gauge, and Probing Cycles
Chapter 27
27-6
CAUTION: If modifying a tool length offset, the offset value
generated with this gauging operation is immediately loaded
into the offset table. Since this offset must be the currently
active offset, it becomes effective either immediately when the
next block is executed, or delayed until the next block that
contains motion on the tool length axis is executed (when an
offset is activated is determined in AMP).
The G37 series of G-codes always produce linear motion regardless of the
current mode active at their execution. After their completion, the control
returns to the operating mode active before the skip block was read (G00,
G01, G02, G03).
Important: The move that immediately follows a G37 series skip block
cannot be a circular move.
The system installer determines in AMP if the new value is added to, or
replaces the old value in the table. The system installer also determines in
AMP what gauge cycles alter which tool offset tables, geometry, or wear.
If these probe parameters have been entered, the control automatically
compensates for probe radius and length when calculating tool offset
changes.
The coordinates of the axes when the external skip signal is received are
available as the paramacro system parameters #5061-#5066 (work
coordinate system) and #5071-#5076 (machine coordinate system). These
values will have been adjusted to compensate for the probe tip radius and
the probe length if radius and length compensation values were entered.
For example, assume you have entered a probe tip radius of .01. It is
triggered as axis 2 approaches in the positive direction at the axis 2
coordinate of 1.1200. The value available for paramacro parameter #5072
would be 1.1300
Probe tip radius and probe length are defined by the system installer in
AMP. These values may also be changed through the paramacro system
parameters #5096 (for radius) and #5095 (for length), or through the probe
parameter table described in section 27.5.
Refer to the paramacro chapter for details on paramacro parameters.