Analog Electronic Modules
12-47
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Table 12-65Compensation of the Reference Junction Temperature
Option Reference Junction
Parameters
Description
Use of a Pt100
Climatic Range
resistance
thermometer to
record the
reference junction
temperature (best
method)
You can record the reference
junction temperature using a
resistance thermometer (Pt100
Climatic Range). Given appropriate
parameter assignment, this
temperature value in the ET 200S is
distributed to the 2AI TC Standard
modules and calculated in the
modules together with the
temperature value obtained for the
measurement point.
Number of reference junctions:
IM151-1 STANDARD,
IM151-1 FO STANDARD: 8
IM151-1 BASIC,
IM151-1 HIGH FEATURE: 1
The parameter assignment of
the IM151-1 and the 2AI TC
must be coordinated:
2AI RTD Standard
parameterized to the
Pt100 climatic range at the
correct slot;
2AI TC Standard:
Reference junction: RTD;
select the correct
reference junction number
(always 1 in the case of
the IM151-1 BASIC; High
Feature)
IM:
Assignment of the
reference junction to a slot
with the 2AI RTD
Standard; selection of a
channel;
Internal
compensation in
the case of the
2AI TC High
Feature
There is a temperature sensor in the
TM-E15S24-AT and TM-E15C24-AT
terminal modules. The temperature
sensor reports the temperature of the
terminals to the 2AI TC High Feature.
This value is then calculated
together with the measured value
from the channel of the electronic
module.
2AI TC High Feature:
Reference junction: yes
Extension to a Reference Junction
The thermocouples can be extended from their connection point by means of
equalizing lines to the reference junction (transition to Cu line) or the compensating
box. The reference junction can also be an ET 200S terminal module.
The equalization lines are made of the same material as the wires of the
thermocouple. The incoming lines are made of copper. Ensure correct polarity
when connecting.
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