Connecting Voltage And Current Sensors - Siemens simatic c7-621 Hardware Installation Manual

7.1.1

Connecting Voltage and Current Sensors

Abbreviations
The abbreviations in Figures 7-3 to 7-4 have the following meaning:
Connecting
Figure 7-3 shows the connection of voltage sensors to a non-floating analog
Voltage Sensors input.
Figure 7-3
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01
AIx-X: Measuring cable AIx-I or AIx-U
AIx-M: Measuring cable reference potential
M: Reference potential of the analog measuring circuit (functional
ground )
Analog inputs
AI1-U
+
U
AI1-M
-
AI2-U
+
U
AI2-M
-
.
.
.
Connecting Non-Isolated Sensors to a Non-Floating Analog Input
C7-621 Analog I/Os
C7-621
ADC
Logic
M
Functional ground
C7-CPU
7-5