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Connecting

5.1

Connecting measuring sensors

Introduction

You can connect encoders with voltage signals and thermocouples to the 2AI TC ST analog

input module.

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

out for when doing so.

Cables for analog signals

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

effect of interference. You should ground the shield of the analog cables at both ends. If

there are differences in potential between the cable ends, an equipotential bonding current

that may interfere with the analog signals will flow across the shield. If this is the case, you

should only ground the shield at one end of the cable.

Analog input modules

The analog input modules are electrically isolated:

● Between the logic and backplane bus

● Between the load voltage and the channels.

Connecting measuring encoders to analog inputs

There can be only a limited potential difference U

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

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.

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

Manual, 04/2007, A5E01076883-01

– Electrical isolation: No link between M

Note

Ensure that this difference in potential U

there is a possibility of exceeding the permitted value, establish a connection between

terminal M

and the central grounding point.

ANA

and the central grounding point (U

ANA

does not exceed the permitted value. If

ISO

(common mode) between the measuring

)

ISO

. To

ANA