Analog Electronics Modules
ET 200iS Distributed I/O Station
A5E00087831-02
14-39
14.2
Basics of Analog Value Processing
14.2.1 Connecting
Thermocouples
Introduction
This section contains additional information on connecting thermocouples.
Compensation of the Reference Junction Temperature
There are several ways in which you can measure the reference junction
temperature to obtain an absolute temperature value from the difference in
temperature between the reference junction and the measurement junction.
Table 14-68
Compensation of the Reference Junction Temperature
Options
Explanation
Reference Junction Parameter
No compensation
You obtain not only the temperature of
the measurement junction. The
temperature of the reference junction
(transition from copper lead to
thermocouple lead) also influences the
thermal e.m.f. The measured value is
therefore inaccurate.
none
Use of a resistance
thermometer Pt100 climate
range to measure the
reference junction
temperature (practical
method)
You can measure the reference
junction temperature using a
resistance thermometer (Pt100 climate
range). With suitable parameter
settings, this temperature value is
distributed to the 2AI TC modules in
the ET 200iS and used to correct the
measured temperature value of the
measurement junction. You can use 8
different reference junctions in the ET
200iS.
The parameter settings of the IM
151-2 and the 2AI TC must be
matched:
•
2AI RTD set to Pt100 climate
range in the correct slot;
•
2AI TC: Reference junction:
RTD; Select the correct
reference junction number;
•
IM 151-2: Assign the
reference junction to a slot
with 2AI RTD; Select a
channel;
Содержание SIMATIC ET 200iS
Страница 20: ...Preface ET 200iS Distributed I O Station 1 6 A5E00087831 02 ...
Страница 34: ...Product Overview ET 200iS Distributed I O Station 2 14 A5E00087831 02 ...
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Страница 390: ...12 Product Information to the manual Distributed I O device ET 200iS Version 10 2001 A5E00163808 02 ...
Страница 416: ...26 Product Information RS 485 IS Coupler 6ES7 972 0AC80 0XA0 A5E00207628 01 ...
Страница 417: ...27 Product Information RS 485 IS Coupler 6ES7 972 0AC80 0XA0 A5E00207628 01 ...
Страница 418: ...28 Product Information RS 485 IS Coupler 6ES7 972 0AC80 0XA0 A5E00207628 01 ...
Страница 419: ...28 Produktinformation RS 485 IS Koppler 6ES7 972 0AC80 0XA0 A5E00207082 01 ...
Страница 420: ...28 Product Information RS 485 IS Coupler 6ES7 972 0AC80 0XA0 A5E00207628 02 ...