Siemens Simatic S7-400

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
2 3
+24 V
+
-
M
I+
M-
+
-
M
ANA
M
V+
M
V+
M
I+
M-
M
I+
M
I+
M
P
P
Figure 5-9 Connecting 2-wire transducers to an SM 431; 8 x 13 Bit
M
I+
: Measuring current (positive)
M
V+
: Measuring voltage (positive)
M +: Measuring line (positive)
M
ANA
: Reference potential of the analog measuring circuit
M -: Measuring line (negative)
(1) Sensor, for example, pressure gauge
(2)+(3) 2-wire transducer
Analog modules
5.11 Connecting current sensors
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08 209