Siemens 2AI 2/4WIRE HF Manual - Página 22

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Connecting

5.1 Connecting measuring sensors

Connecting measuring encoders to analog inputs

There can only be a limited potential difference U

lines of the input channels. To ensure that the permitted value is not exceeded, you must

take different steps depending on the whether the encoders are isolated or non-isolated. The

steps you have to take are described in this chapter.

Abbreviations used

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

M+:

M-

L+

ISO

Measuring line (positive)

Measuring line (negative)

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

(common mode) between the measuring

and central grounding point

ANA

2 AI I 2/4WIRE HF analog electronic module (6ES7134-4MB02-0AB0)

Manual, 04/2007, A5E01076111-01