Siemens SINAMICS S120 Function Manual page 525

Instructions for data set changeover
Using drive data set changeover (DDS), motor data sets (MDS, p0186) and encoder data
sets (EDS, p0187 to p0189) can be changed over. The following table shows when the
reference bit (r2684.11) or the status of the adjustment with absolute encoders (p2507) is
reset.
In the following cases, when a DDS changeover takes place, the actual position value
becomes invalid (p2521 = 0) and the reference point (r2684.11 = 0) is reset.
● The EDS that is effective for the position control changes.
● The encoder assignment changes (p2502).
● The mechanical relationships change (p2503...p2506)
With absolute encoders, the status of the adjustment (p2507) is also reset, if the same
absolute encoder is selected for the position control although the mechanical relationships
have changed (p2503 ... p2506).
In the operation state, a fault (F07494) is also output.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Function modules
8.8 Basic positioner
525