Siemens SINUMERIK 840D sl Programming Manual page 339

Prerequisite
The surface must be parallel to an axis of the workpiece coordinate system and have low
surface roughness.
The workpiece probe is called as a tool with tool offset and positioned opposite the
calibration surface. 5xy should be entered as the tool type.
Parameter
Parameter
_MVAR
_SETVAL
_MA
_MD
_PRNUM
1) It is also possible to calibrate in the 3rd axis (Y in G18), provided that this axis exists.
Additional parameters _VMS, _TZL, _TSA, _FA and _NMSP also apply.
Notice
The first time calibration is performed the default setting in the array of the probe is still "0".
For that reason _TSA> probe ball radius must be programmed to avoid alarm "Safe area
violated".
See also
Defining parameters (Page 2-2)
Result parameters (Page 2-4)
Variable measuring velocity: _VMS (Page 2-14)
Tolerance parameters: _TZL, _TMV, _TUL, _TLL, _TDIF and _TSA (Page 2-15)
Measurement path: _FA (Page 2-16)
Multiple measurement at the same location: _NMSP (Page 2-19)
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Data type
0
REAL
1, 2, 3
1)
0 positive axis direction
1 negative axis direction
INT
Measuring Cycles for Turning Machines
6.4 CYCLE973 Calibrating workpiece probes
Meaning
Calibration on surface (workpiece-related)
Setpoint referred to the workpiece zero, for facing
axis in the diameter (DIAMON)
Measuring axis
Measuring direction
Probe number
6-63