Siemens SIMATIC S5 Equipment Manual page 79

Matching Module 2 for Abaolute Encoders
Instructions for conditioning the input circuitry
– In the encoder impedance range from 6 k!d to 10 k$l, wire jumpers can be inserted for R103,
– Below 6 kQ encoder impedance, the resistor networks must be individually {
computed.
– The high level at R106 or R107 must be between 3 V and 5 V.
– The low level at R106 or R107 must be below or equal to 0.8 V.
+ 24 V
M
(U – U2)
X
U2
Explanation:
R
R2
U2 Voltage at R106, R107 (min. 3 V, max. 5 V)
u Encoder voltage (24 V)
R–Encoder : Encoder impedance (see label or data sheet)
to proceed:
How
a) Compute the value R max. with U2 min. (3 V)
b) Compute the value R min. with U2 max. (5 V)
c) Select the resistor network according to E–series (between R max. and R min.)
Only resistor networks consisting of single resistors maybe used.
See the technical specifications, section 8.6.
5 – 4
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– R–Encoder
@.SiemensA(31989, order No.: 6ES5898-0KD21
: U 2 minimum = 3 V