Siemens SIMATIC S7-400 Reference Manual page 210

Analog modules
5.11 Connecting current sensors
Connecting 4-wire transducers
1
Figure 5-10
M +:
M -:
M
ANA
U :
H
(1)
(2)
(3)
SM 431; 8 x 13 Bit: Connecting 4-wire transducers
To ensure that the permissible value for U
to M
1
Figure 5-11
210
2
P
P
U
H
3
Connecting 4-wire transducers to an AI
Measuring line (positive)
Measuring line (negative)
: Reference potential of the analog measuring circuit
Auxiliary voltage
Sensor, for example, pressure gauge
4-wire transducer
Connection required for modules with M
.
ANA
2
P
P
U
H
Connecting 4-wire transducers to an SM 431; 8 x 13 Bit
M+
+
M-
-
M+
+
M-
-
M
ANA
ana
is not exceeded, you must connect the M-cables
CM
M
V+
M
I+
+
M
I+
-
M-
M
+
V+
M
-
I+
M
I+
M-
M
Reference Manual, Ausgabe 11/2016, A5E00850736-08
S7-400 Automation System Module Data