Siemens simatic c7-621 Hardware Installation Manual page 88

C7-621 Analog I/Os
Connecting 4-wire transducers have a separate power supply U
Sensors as 4-Wire
connection of sensors as 4-wire measuring transducers to a non-floating
Transducers
analog input.
Sensor
e.g. pressure
meas.
Figure 7-4
Note
2-wire transducers cannot be operated with the C7 units.
7-6
Analog inputs
AI1-U
+
AI1-M
P
-
AI2-U
+
P
-
AI2-M
U
H
L+
Input 24V DC
M
NC
NC
Functional ground
Connecting 4-Wire Transducers to a Non-Floating Analog Input
. Figure 7-4 shows the
H
C7-621
ADC
Logic
.
.
.
M
Grounding bar
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01
C7-CPU