Siemens SIMATIC S7-400 Reference Manual page 209
Automation system module
data
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SM 431; 8 x 13 Bit: Connecting 2-wire transducers
Because the supply voltage for the 2-wire transducers is not fed by the SM 431; 8 x 13 Bit,
you must supply the sensors separately with 24 V.
1
Figure 5-9
M
:
I+
M
V+
M +:
M
ANA
M -:
(1)
(2)+(3)
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
2
3
P
P
Connecting 2-wire transducers to an SM 431; 8 x 13 Bit
Measuring current (positive)
:
Measuring voltage (positive)
Measuring line (positive)
:
Reference potential of the analog measuring circuit
Measuring line (negative)
Sensor, for example, pressure gauge
2-wire transducer
+24 V
M
V+
M
+
I+
-
M
I+
M-
+
M
-
V+
M
I+
M
I+
M-
M
M
ANA
Analog modules
5.11 Connecting current sensors
209
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