Siemens SIMATIC ET 200S Handmatig - Pagina 28

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Connecting

5.2 Connecting thermocouples

5.2

Connecting thermocouples

Introduction

This section contains additional information on connecting thermocouples.

Compensation of the comparison point temperature

There are various ways of obtaining the comparison point temperature in order to get an

absolute temperature value from the temperature difference between the comparison point

and the measuring point.

Table 5-1

Compensation of the comparison point temperature

Option

No compensation

Using a compensating box

on the supply lines of a

single thermocouple

Use of a Pt 100 Climatic

Range resistance

thermometer to record the

reference junction

temperature (best method)

Extension to a comparison point

The thermocouples can be extended from their connection point by means of compensating

lines to the comparison point (transition to Cu line) or the compensating box. The

comparison point can also be an ET 200S terminal module.

The compensating lines are made of the same material as the wires of the thermocouple.

The supply lines are made of copper. Ensure the correct polarity when connecting.

Description

It is not just the temperature of the measuring

point that you need to record: The temperature of

the comparison point (transition from Cu line to

thermocouple line) also affects the thermo-

electromotive force. The measured value on its

own is incorrect.

You compensate using a compensating box. The

compensating box is the transition point from the

Cu line to the thermocouple line. No further

processing is necessary using the 2AI TC ST.

You can record the reference junction

temperature using a resistance thermometer

(Pt 100 Climatic Range). Given appropriate

parameter assignment, this temperature value in

the ET 200S is distributed to the 2AI TC ST

modules and calculated in the modules together

with the temperature value obtained for the

measurement point.

Number of reference junctions: 1

Comparison point parameters

None

The parameter assignment of the IM151-1

and the 2AI TC must be coordinated:

2AI RTD ST assigned parameters to

•

the Pt 100 climatic range at the correct

slot;

2AI TC ST: Reference junction : RTD;

•

select reference junction number 1

IM : Assignment of the reference

•

junction to a slot with the 2AI RTD ST;

selection of a channel;

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

Manual, 04/2007, A5E01076883-01