Siemens SINUMERIK 840D sl Programming Manual page 44

General
1.10 Parameters for checking the measurement result and offset
Dimensional difference check _TDIF
_TDIF is active only for workpiece measurement with automatic tool offset and for tool
measurement.
This limit has no effect on generation of the compensation value either. When it is reached,
the tool is probably worn and needs to be replaced.
Note
An alarm text is displayed to warn the operator and the program can be continued by means
of an NC start.
This tolerance limit is generally used by the PLC for tool management purposes (twin tools,
wear monitoring).
Tolerance of the workpiece _TLL, _TUL
Both parameters are active only for tool measurement with automatic tool offset.
When measuring a dimensional deviation ranging between "2/3 tolerance of workpiece" and
"Dimensional difference control", this is regarded 100 % as tool compensation. The previous
average value is erased.
This enables a fast response to major dimensional deviations.
Note
When the tolerance limit of the workpiece is exceeded, this is indicated to the user
depending on the tolerance position "oversize" or "undersize".
1-28
Note
AUTOMATIC mode
AUTOMATIC operation is interrupted and the program cannot continue. An alarm text
appears to warn the user.
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles