Siemens Sinamics S120 Function Manual page 337

Figure 7-7
For linear encoders, the interrelationship between the physical quantity and the neutral
length unit LU is configured using parameter p2503 (LU/10 mm).
Example:
Linear encoder, 10 mm should have a resolution of 1 µm (i.e. 1 LU = 1 µm).
-> p2503 = 10000
Figure 7-8
A correction can be made using connector input p2513 (correction value, position actual
value conditioning) and a positive edge at binector input p2512 (activates the correction
value). When the "basic positioning" function module is activated, p2513 is automatically
interconnected with r2685 (EPOS correction value) and p2512 with r2684.7 (activate
correction). This interconnection enables modulo offset by EPOS, for example.
p2516 can be used to switch in position offset. Using EPOS, p2516 is automatically
interconnected to r2667. Backlash compensation is implemented using this interconnection.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Position actual value sensing with linear encoders
Position actual value conditioning
Function modules
7.7 Closed-loop position control
335