Siemens SIMATIC ET 200C Manual page 102

Mechanical and Electrical Installation
Wiring of ET 200C; AI 4
Current Sensors
Current sensors can be connected for the measured-value ranges 0 ... 20 mA,
4 ... 20 mA,
The parallel shunt resistor must be activated before a channel can be used for
measuring currents.
The settings of the switches in DIL switch block S5 determine whether mea-
surement is floating or non-floating (see Section 4.4.1).
Note
If a current sensor is used for floating measurement, the maximum
permissible common-mode voltage is U
overshot relative to M
The illustration below shows how current sensors are connected in a 2-wire
circuit for floating measurement:
Figure 4-22
4-34
12 Bit (6ES7 144-0HF00-0KB0), Continued
20 mA.
at any differential input.
ANA
+
mA
CH0
–
+
mA
CH1
–
.
CH2
Shield
CH3
M
ANA
Connection to ET 200C; AI 4
Circuit for Floating Measurement
1 V and must not be
CM
+
–
+
–
+
–
+
–
12 Bit of Current Sensors in 2-Wire
ET 200C Distributed I/O Station
EWA 4NEB 812 6119-02b