Siemens SINUMERIK 840D sl Function Manual page 1523

If the first substring is empty (except for white spaces), the complete tool length is calculated
allowing for all components. This applies even if the _COMP parameter is not specified.
An optional programmable colon must be followed by a single character specifying the
coordinate system, in which the tool length components are to be evaluated. If no coordinate
system is specified, the evaluation is performed in the MCS (machine coordinate system).
If any rotations are to be taken into account, they are specified in the tool environment
defined in _STAT.
The characters have the following significance:
B:
K:
M:
T:
W:
_STAT
Name of the data set for describing a tool environment.
If the value of this parameter is the null string ("") or is not specified, the current status is
used.
_T
Internal T number of tool
If this parameter is not specified, or if its value is 0, the tool stored in _STAT is used.
If the value of this parameter is -1, the T number of the active tool is used. It is also possible
to specify the number of the active tool explicitly.
Note
If _STAT is not specified, the current 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 that 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 local compensation. 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 environment is used,
the D number of the tool environment is also read, otherwise the D number of the currently
active tool is read.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic coordinate system (BCS)
Tool coordinate system of kinematic transformation (KCS)
Machine coordinate system (MCS)
Tool coordinate system (TCS)
Workpiece coordinate system (WCS)
STRING
INT
INT
INT
W1: Tool offset
18.12 Working with tool environments
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