Siemens SIMATIC S7 - Wiring the Inputs for Channels 13 and 14 to Connect Transducers

Operation
2–21
IP244
C79000–B8576–C859–02
3.1.2 Wiring the Inputs for Channels 13 and 14 to Connect Transducers
(0 to 20.48 V = 2048 Units Resolution)
The inputs have resistors R
S
and R
P
connected as voltage dividers (400:1). This allows a signal
range of 0 to 20.48 V. Other voltage ranges require other voltage dividers.
Fig. 3.1.2/1  Connecting floating transmitters from 0 to 20.48 V
R
S
Transmitter
0 to 20.48 V
R
P
-
+
-
+
Multiplexer
-
+
M-
M+
to MĆbar
0 V, MĆbar
in cabinet
(reference potential)
=
Channel 13:
R
S
= R83
R
P

= R84
Channel 14:
R
S
= R85
R
P

= R86
U
CM
  1 V
PP