Siemens SINUMERIK 840D sl Programming Manual page 541

Reference groove
A groove located in the working area (permanent feature of the machine) whose precise
position is known and that can be used to calibrate workpiece probes.
Safe area
The safe area _TSA does not affect the offset value; it is used for diagnosis. If this limit is
reached, there is a defect in the probe or the set position is incorrect.
Setpoint
In the measuring procedure "inprocess measurement", a position is specified as the setpoint
value for the cycle at which the signal of the touch-trigger probe is expected.
Tolerance bottom limit
When measuring a dimensional deviation as the lower tolerance limit (_TLL) ranging
between "2/3 tolerance of workpiece" and "Dimensional difference control", this is regarded
100% as tool compensation. The previous average value is erased.
Tolerance top limit
When measuring a dimensional deviation as the upper tolerance limit (_TUL) ranging
between "2/3 tolerance of workpiece" and "Dimensional difference control", this is regarded
100% as tool compensation. The previous average value is erased.
Tool environment
As from NCK SW 6.3, you can save the operating environment of a particular tool you are
using. This is to allow you to correct the tool used to measure a workpiece taking into
account the operating conditions (environment: G commands, setting data,...).
You then no longer have to specify the T, D, DL number in the offset explicitly. These are
included in the stored tool environment. The name of a tool environment can have up to 32
characters.
Tool name
If tool management is active, the name of the tool can be entered in parameter _TNAME as
an alternative to the -> tool number.
The tool number is derived from it within the cycle and entered in _TNUM.
Tool number
The parameter _TNUM contains the tool number of the tool to be automatically offset after
workpiece measurement.
Trigger point
The trigger points of the probe are ascertained during calibration and stored in block GUD6
for the axis direction.
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Glossary
Glossary-5