Siemens SINAMICS S120 Function Manual page 433

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
Istw_aufb Korr akt
p2512[0...3]
[-/3646.7]
Figure 7-8
A correction can be made using connector input p2513 (correction value, actual position
value processing) 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.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Actual position value sensing with linear encoders
Istw_aufb Korr akt
p2730[0...1]
(0)
Position difference between
LU
2 sampling times
Istw_aufb Korr
p2513[0...3]
(0/2684.7)
[-/3635.7]
Actual position value processing
0
0
1
+
–
+
Y = Y
n
+
+
1
0
0
s_ist setzen Setzw
p2515[0...3]
(0/2685)
s_ist setzen Akt
7.7 Closed-loop position control
Lageoffset
p2516[0...3]
(0/2667)
[-/3635.7]
X
n
Y
n
+ X
n - 1 n
+
(0)
p2514[0...3]
(0)
Function modules
Lageistwert
+
(s_ist)
431