Siemens SINUMERIK 840D sl Programming Manual page 522

Tool offsets
7.11 Cutting data modification for tools that can be rotated (CUTMOD)
System variables
The following system variables are available:
System variables
$P_CUTMOD_ANG /
$AC_CUTMOD_ANG
$P_CUTMOD /
$AC_CUTMOD
$P_CUT_INV /
$AC_CUT_INV
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Significance
Supplies the (non-rounded) angle in the active machining plane, that was
used as basis for the modification of the cutting data (tool nose position,
cut direction, clearance angle and holder angle) for the functions
activated using CUTMOD and/or $SC_CUTDIRMOD.
$P_CUTMOD_ANG refers to the actual state in the preprocessing,
$AC_CUTMOD_ANG to the actual main run block.
Reads the currently valid value that was last programmed using the
command CUTMOD (number of the toolholder that should be activated for
the cutting data modification).
If the last programmed CUTMOD value = -2 (activation with the currently
active toolholder that can be orientated), then the value -2 is not returned
in $P_CUTMOD, but the number of the active toolholder that can be
orientated at the time of programming.
$P_CUTMOD refers to the actual state in the preprocessing,
$AC_CUTMOD to the actual main run block.
Supplies the value TRUE if the tool is rotated so that the spindle direction
of rotation must be inverted. To do this, the following four conditions must
be fulfilled in the block to which the read operations refer:
1. If a turning or grinding tool is active
(tool types 400 to 599 and / or
SD42950 $SC_TOOL_LENGTH_TYPE = 2).
2. The cutting influence was activated using the language command
CUTMOD.
3. A toolholder that can be orientated is active, which was designated
using the numerical value of CUTMOD. Check - I reformulated.
4. The toolholder that can be orientated rotates the tool around an axis
in the machining plane (this is typically the C axis) so that the
resulting perpendicular of the tool cutting edge is rotated with respect
to the initial position by more than 90° (typically 180°).
The contents of the variable is FALSE if at least one of the specified four
conditions is not fulfilled. For tools whose tool nose position is not
defined, the value of the variable is always FALSE.
$P_CUT_INV refers to the actual state in the preprocessing and
$AC_CUT_INV to the actual main run block.
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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