Siemens SINUMERIK 828D Function Manual page 1535

System variables
The following system variables are available:
System variables
$P_CUTMOD_ANG /
$AC_CUTMOD_ANG
$P_CUTMOD /
$AC_CUTMOD
$P_CUT_INV /
$AC_CUT_INV
All main run variables ($AC_CUTMOD_ANG, $AC_CUTMOD and $AC_CUT_INV) can be read in synchronized
actions. A read access operation from the preprocessing generates a preprocessing stop.
Modified cutting data
If a tool rotation is active, the modified data are made available in the following system variables:
System variable
$P_AD[2]
$P_AD[10]
$P_AD[11]
$P_AD[24]
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Description
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.
Description
Length of cutting edge
Holder angle
Cut direction
Clearance angle
18.7 Cutting data modification for tools that can be rotated
W1: Tool offset
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