Siemens SINAMICS S120 Function Manual page 436

Function modules
7.7 Closed-loop position control
The load actual position value in r2723 (must be requested via Gn_STW.13, see Section
"Control and status words for encoders") comprises the following information:
● Encoder pulses per revolution (p0408)
● Fine resolution per revolution (p0419)
● Virtual number of stored revolutions of a rotary absolute encoder (p2721)
● Load gear ratio (p2504/p2505)
● Measuring gear ratio (p0433/p0432), if p0411.0 = 1
Note
The sum of p0408, p0419 and p2721 is limited to 32 bits.
Note
Load gear problems and solutions, see example in Section Position tracking -> Measuring
gear.
Requirements
● Absolute encoder
Features
● Configuration via p2720
● Virtual multiturn via p2721
● Tolerance window for monitoring the position at switching on p2722
● Input of the load gear via p2504 and p2505
● Display via r2723
Example of position area extension
With absolute encoders without position tracking, it must be ensured that the traversing
range around 0 is smaller than half the encoder range, because beyond this range, no
unique reference remains after switching on and off (see description on parameter p2507).
This traversing range can be extended using the virtual multiturn (p2721).
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Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions