Siemens S5-135U/155U - Manual (Page 400)

9-18
System Manual
C79000-G8576-C199-06
Example:
(Special case) The temperature of the busbar of an electroplating bath is to be
measured with an uninsulated thermocouple.
+
–
U
E
+
–
U
CM
A
D
MUX
M+
M–
U CM
#
0 V Bus
Analog Input Module
Sensor,
Not Isolated
Range
Card for
4 Inputs
Figure 9-7 Measuring Circuit without Equipotential Bonding Conductor for the 460 Analog Input Module
The potential of the busbar with respect to the reference potential of the
module is, for example, 24 V DC. A 460 analog input module with isolated
input is used (U
CM
= 60 V AC/75 V DC). An equipotential bonding
conductor must not be laid here because it would short-circuit the busbar.
Analog Input/Output Modules