
Analog modules
5.11 Connecting current sensors
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
227
SM 431; 8 x 13 Bit: Connecting 4-wire transducers
To ensure that the permissible value for U
CM
is not exceeded, you must connect the M-
cables to M
ANA
.
1
2
M
+
-
+
-
U
H
M
I+
M
I+
M-
M
V+
M
V+
M
I+
M
I+
M-
P
P
M
I+
: Measuring current (positive)
M
V+
: Measuring voltage (positive)
M +: Measuring line (positive)
M -: Measuring line (negative)
U
H
: Auxiliary voltage
(1) Sensor, for example, pressure gauge
(2) 4-wire transducer
Figure 5-11 Connecting 4-wire transducers to an SM 431; 8 x 13 Bit
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