Siemens SINUMERIK Commissioning Manual page 548

Appendix
A.4 List of Pl services
Service
Parameter
_N_SETUFR
A-20
Explanation
Example
The SYSTEM OR USER variables 'linShift', 'mirrorImgActive', 'rotation' and
'scaleFact' in channel-specific data block FU can be used to define up to 8 zero
offsets per channel. PI service _N_SETUFR must be called in order to activate
these user-defined zero offsets.
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Activation of a user frame.
PI_SERVICE("_N_SETUFR")
Commissioning Manual, 11/2006, 6FC5397-0DP10-0BA0
Expanding the user interface