Siemens SINUMERIK 840D sl Function Manual page 1530

W1: Tool offset
18.12 Working with tool environments
Note
If _STAT is not specified, the actual status is used as the tool environment. Since _T = 0 refers
to the T number saved in the tool environment, the active tool is used in this environment, i.e.
parameters _T = 0 and _T = -1 have the same meaning in this special case.
_D
Cutting edge of the tool. If this parameter is not specified, or if its value is 0, the D number
used is based on the source of the T number. If the T number from the tool environment is
used, the D number of the tool environment is also read, otherwise the D number of the
currently active tool is read.
_DL
Number of the offset dependent on the location. If this parameter is not specified, the DL
number used is based on the source of the T number. If the T number from the tool envi‐
ronment is used, the D number of the tool environment is also read, otherwise the D number
of the currently active tool is read. If T, D and DL specify a tool without location-dependent
offsets, no additive or setting-up offsets may be specified in parameter _COMP (error code
in "Status").
Not all possible combinations of the three parameters _COMP, _CORCOMP and
_CORMODE are sensible. For example, algorithm 3 in _CORCOMP requires that two
characters are specified in _COMP. If an invalid parameter combination is specified, then a
corresponding error code is returned in the status.
Note
Calculating the tool length depending on machine data MD20360
The two least significant bits of this machine data specify how the wear (bit 0) and tool length
(bit 1) are to be evaluated if a diameter axis is used for turning and grinding tools. If the
appropriate bits are set, then for the tool length calculation, a factor of 0.5 is applied to the
associated entry. The correction using SETTCOR is executed so that the total effective tool
length change is equal to the value transferred in _CORVAL.
The correction of the components, whose length is evaluated with a factor of 0.5 due to the
following machine data for the length calculation, must be realized using twice the transferred
value:
MD20360 $MC_TOOL_PARAMETER_DEF_MASK (definition of tool parameters)
Example 1
N10
N20
N30
1530
INT
INT
def real _CORVAL[3]
$TC_DP1[1,1] =
$TC_DP3[1.1] =
120 ; Milling tool
10.0 ; Geometry L1
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions