Connecting
5.1 Connecting measuring sensors
2AI U HS analog electronic module (6ES7134-4FB51-0AB0)
Manual, 04/2007, A5E01076015-01
21
Non-isolated measuring sensors
The non-isolated measuring sensors are connected to the local ground potential. You must
connect M
ANA
to the ground potential. Depending on local conditions or interference,
potential differences U
CM
(static or dynamic) can occur between the locally distributed
measuring points.
If the permitted value for U
CM
is exceeded, there must be equipotential bonding conductors
between the measuring points.
The following figure illustrates the connection of non-isolated measuring sensors to a floating
analog input module.
5
4
1
2
3
0
0
/
0
0
$1$
0
0
8
&0
$'8
8
,62
① Logic
② Backplane bus
③ Ground bus
④ Equipotential bonding cable
⑤ Non-isolated measuring sensors
Sensor selection
Note the following factors when selecting the sensors:
● Length, impedance, and capacitance of the cable
● Reaction speed of the utilized 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.
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