Siemens simatic c7-621 Hardware Installation Manual page 86

C7-621 Analog I/Os
Figure 7-2 shows the connection of non-isolated sensors to a floating analog
input module.
Equipotential
bonding cable
Figure 7-2
7-4
Analog inputs
AI1-U
+
U
AI1-M
Isolated
-
AI2-U
sensor +
U
AI2-M
-
U
CM
L+
Input 24V DC
M
NC
NC
Functional earth
Connecting Non-Isolated Sensors to a Floating Analog Input
C7-621
ADC
Logic
.
.
.
M
Grounding bar
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01
C7-CPU