Siemens SIMATIC ET 200S Handmatig - Pagina 26

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Connecting

5.1 Connecting measuring sensors

Abbreviations used

The meanings of the abbreviations in the figures below are as follows:

M+:

M-

ANA

L+

ISO

Isolated measuring encoders

The isolated measuring encoders are not connected to the local ground potential. These can

be potential-free. Depending on local conditions or interference, potential differences U

(static or dynamic) can occur between the measuring lines M- of the input channels and the

reference point of the measuring circuit M

To ensure that the permitted value for U

interference, the following applies:

● For the 2AI TC analog input module: Connect M- to M

The following schematic representation illustrates the connection of isolated measuring

encoders to the optically isolated analog input modules.

①

②

③

④

⑤

⑥

Measuring line (positive)

Measuring line (negative)

Reference potential of the analog measuring circuit

Ground connection

Rated load voltage 24 V DC

Potential difference between inputs and reference potential of the measuring

circuit M

ANA

Potential difference between M

Logic

Backplane bus

Ground bus

Central grounding point

Recommended connection

Isolated measuring encoders

and central grounding point

ANA

is not exceeded in environments with strong EMC

2AI TC ST analog electronic module (6ES7134-4JB00-0AB0)

ANA

Manual, 04/2007, A5E01076883-01