Siemens SINUMERIK 840D sl Programming Manual page 40

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".
2/3 workpiece tolerance _TMV
_TMV is active only for workpiece measurement with automatic tool offset.
Within the range of "Lower limit" and "2/3 workpiece tolerance" the mean value is calculated
according to the formula described in Section "Measuring strategy".
Note
My
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My
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• If My
• If My
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is compared with the zero compensation range:
is greater than this range, compensation is corrected by My
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mean value memory is cleared.
is less than this range, no compensation is carried out. to prevent excessively
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abrupt compensations.
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
and the associated
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Measuring cycles