Siemens SIMATIC ET 200S Manual page 25

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 schematic representation illustrates the connection of non-isolated measuring
sensors to an optically isolated analog input module.
Connection of non-isolated measuring sensors to an optically isolated analog input module:
5
4
①
②
③
④
⑤
Operating four-wire transducers on an external voltage supply
If there is galvanic isolation between the output and the supply of the measuring transducer,
you can connect it to the 2AI I 4WIRE without additional connections.
If there is no galvanic isolation between the output and the transmitter supply, you can only
connect the transmitter to the 2 AI I 4WIRE if the reference potential of the supply voltages
(24 V DC) is the same.
If there is an increase in interference radiation, a connection between M- and M
terminal module of the 2 AI I 4WIRE is recommended.
2AI I 4WIRE HS analog electronic module (6ES7134-4GB62-0AB0)
Manual, 01/2008, A5E01076124-02
to the ground potential. Depending on local conditions or interference,
ANA
(static or dynamic) can occur between the locally distributed
CM
is exceeded, there must be equipotential bonding conductors
CM
Logic
Backplane bus
Ground bus
Equipotential bonding conductor
Non-isolated measuring sensors
1
3
5.1 Connecting measuring sensors
2
ANA
Connecting
on the
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