Siemens SIMATIC ET 200S Manual - Página 19

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Connecting

5.1

Introduction

You can connect encoders with voltage signals to the 2AI U HS analog input module.

In this chapter you will find out how to connect the measuring sensors and what to watch for

when doing so.

Lines for analog signals

You should use shielded and twisted-pair lines for the analog signals. This reduces the effect

of interference. You should ground the shield of the analog lines at both ends of the line. If

there are differences in potential between the ends of the line, a compensating current flows

via the shield that can interfere with the analog signals. If this is the case, you should only

ground the shield at one end of the line.

Analog input modules

In the case of the analog input modules there is electrical isolation:

● Between logic and backplane bus

● Between load voltage and the channels The following are used:

Connection of measuring sensors to analog inputs

Between the measuring lines M- of the input channels and the reference point of the

measuring circuit M

voltage). To ensure that the permitted value is not exceeded, you must take different steps

depending on the whether the sensors are isolated or non-isolated. The steps you have to

take are described in this chapter.

2AI U HS analog electronic module (6ES7134-4FB51-0AB0)

Manual, 04/2007, A5E01076015-01

– Isolation: No link between M

Note

Ensure that this potential difference U

is a possibility of exceeding the permitted value, make a connection between terminal

and the central grounding point.

ANA

there can be only a limited potential difference U

ANA

and the central grounding point (U

ANA

does not exceed the permitted value. If there

ISO

)

ISO

(common-mode