Siemens 6ES7134-4FB51-0AB0 Manual page 21

Non-isolated measuring sensors
The non-isolated measuring sensors are connected to the local ground potential. You must
connect M
potential differences U
measuring points.
If the permitted value for U
between the measuring points.
The following figure illustrates the connection of non-isolated measuring sensors to a floating
analog input module.
5
①
②
③
④
⑤
Sensor selection
Note the following factors when selecting the sensors:
● Length, impedance, and capacitance of the cable
● Reaction speed of the utilized sensors
2AI U HS analog electronic module (6ES7134-4FB51-0AB0)
Manual, 04/2007, A5E01076015-01
to the ground potential. Depending on local conditions or interference,
ANA
(static or dynamic) can occur between the locally distributed
CM
4
Logic
Backplane bus
Ground bus
Equipotential bonding cable
Non-isolated measuring sensors
Note
When a sensor is connected or a wire break is repaired during a measuring operation,
false measurements and false diagnostics can occur on both inputs if the permissible
input current is exceeded.
is exceeded, there must be equipotential bonding conductors
CM
3
5.1 Connecting measuring sensors
1
2
Connecting
21