Siemens SINAMICS G120D Operating Instructions Manual page 186

Advanced commissioning
7.6 Basic positioner and position control
Flying referencing
The converter corrects its position actual value while traversing and reduces errors, e.g.
caused by wheel slip or a gear ratio that has not been precisely set.
Example: A pallet on a roller conveyor must be stopped at a specific position. However, the
exact position of the pallet on the conveyor is only known when a sensor is passed.
Figure 7-33
Set the reference point and adjust the absolute encoder
The converter takes the reference point coordinate as the new axis position.
186
Positioning an item to be transported on a roller conveyor
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB