Siemens SIMATIC ET 200C Manual page 97

Voltage Sensors
Free channels can be used to connect voltage sensors ( 80 mV,
The settings of the switches in DIL switch block S4 determine whether mea-
surement is floating or non-floating (see Section 4.4.2).
Note
If a voltage sensor is used for floating measurement, the maximum
permissible common-mode voltage is U
overshot relative to M
The illustration below shows how voltage sensors are connected in a 2-wire
circuit for non-floating measurement:
Figure 4-18
ET 200C Distributed I/O Station
EWA 4NEB 812 6119-02b
500 mV, 1000 mV).
at any differential input.
ANA
+
U
–
+
U
–
Connection to ET 200C; AI 4/8
Circuit for Non-Floating Measurement
Mechanical and Electrical Installation
1V and must not be
CM
1 2
+
COMP
-
OFF
+
CH0
-
+
CH1
-
.
+
CH2
-
+
CH3
Shield
-
+
CH4
-
+
CH5
-
+
CH6
-
+
CH7
-
M
ANA
12 Bit of Voltage Sensors in 2-Wire
250 mV,
4-29