Siemens SIMATIC ET 200C Manual page 106

Mechanical and Electrical Installation
Wiring of ET 200C; AO 4
Load in 4-Wire
The voltage is connected for the load via two high-resistance sensor lines
Circuit (Voltage (S+, S– at terminals
Output)
correct voltage drops of up to 3 V per line.
It is important to ensure that the sensor lines are connected directly to the
load.
The illustration below shows how to connect loads in a 4-wire circuit for
voltage output.
Figure 4-25
4-38
12 Bit (6ES7 145-0HF00-0KB0), Continued
and ) for each channel. In this way it is possible to
+ –
.
R
.
L
S+
S
-
.
R
.
L
S+
S
-
.
Shield
Connection of Loads to ET 200C; AO 4
Voltage Output
+
CH0
-
+
-
+
CH1
-
+
-
+
CH2
-
+
-
+
CH3
-
+
-
12 Bit, 4-Wire Circuit for
ET 200C Distributed I/O Station
EWA 4NEB 812 6119-02b