Siemens SIMATIC ET 200S Manuel - Page 21

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Non-isolated measuring encoders

The non-isolated measuring encoders 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

encoders to an optically isolated analog input module.

Connection of non-isolated measuring encoders to an optically isolated analog input module:

①

②

③

④

⑤

Operating four-wire transmitters on an external voltage supply

If there is electrical isolation between the output and the transmitter supply, you can connect

the transmitter to the 2 AI I 4WIRE ST without the need for additional connections.

If there is no electrical isolation between the output and the transmitter supply, you can only

connect the transmitter to the 2 AI I 4WIRE ST if the reference potential of the supply

voltages (24 V DC) is the same.

If there is an increase in interference radiation, it is recommended that you connect M- to

ANA

2AI I 4WIRE ST analog electronic module (6ES7134-4GB11-0AB0)

Manual, 04/2007, A5E01076100-01

to the ground potential. Depending on local conditions or interference,

ANA

(static or dynamic) can occur between the locally distributed

Logic

Backplane bus

Ground bus

Equipotential bonding conductor

Non-isolated measuring encoders

on the terminal module of the 2 AI I 4WIRE ST.

is exceeded, there must be equipotential bonding conductors

5.1 Connecting measuring sensors

Connecting