Siemens SIMATIC S5 ET 200U - Two-Wire Connection of Voltage Sensors

7-5
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
You can use a compensation box to compensate for the influence of the tem-
perature on the reference junction (e.g. terminal box).
Observe the following rules:
 The compensation box must have a floating supply.
 The power supply must have a grounded shielding winding.
 The compensation box must be connected to terminals 1 and 2 of the ter-
minal block.
You can use the following three modules to connect voltage sensors:
 Analog Input Module 464–8MB11 for voltages of 1 V
 Analog Input Module 464–8MC11 for voltages of 10 V
and
 Analog Input Module 466–8MC11 for voltages from 0 to 10 V
Figure 7-3 shows the two–wire connection of voltage sensors.
13579
24 6 8
10
–
+
–
+
U U UU
+
–
+
–
Figure 7-3 Two–Wire Connection of Voltage Sensors (6ES5 464–8MB11, 464–8MC11,
466–8MC11)
Connection of
Thermocouples
with Compensa–
ting Box to Module
464–8MA11/8MA21
Two–Wire Connec-
tion of Voltage
Sensors
Analog Value Processing