Siemens SINUMERIK 840D sl Function Manual page 662

Measurement (M5)
8.4 Setting zeros, workpiece measuring and tool measuring
In the case of the tool position of two turning tools each with their own reference point, not
only are the input variables of measurement type 23 evaluated but also the values of the
following input variables:
Approach direction and tool orientation +x
$AC_MEAS_TOOL_MASK = 0x2
$AC_MEAS_DIR_APPROACH = 0
Two turning tools with one reference point with a tool position opposite to the orientation
In the case of the tool position of two turning tools with one reference point, not only are the
input variables of measurement type 23 evaluated but also the values of the following input
variables:
Approach direction and tool orientation +x
$AC_MEAS_TOOL_MASK = 0x2 + 0x200
$AC_MEAS_DIR_APPROACH = 0
662
Approach direction and tool orientation -x
$AC_MEAS_TOOL_MASK = 0x40
$AC_MEAS_DIR_APPROACH = 1
Approach direction and tool orientation -x
$AC_MEAS_TOOL_MASK = 0x40
$AC_MEAS_DIR_APPROACH = 1
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions