Analog Electronic Modules
12-49
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Compensation by Means of a Resistance Thermometer at the 2AI RTD
If thermocouples that are connected to the inputs of the 2AI TC have the same
reference junction, compensate by means of a 2AI RTD.
For both channels of the 2AI TC module, you can select “RTD” or “None” as the
reference junction. If you select “RTD,” the same reference junction (RTD channel)
is always used for both channels.
I
C+
M–
M+
I
C–
M–
M+
2
3
4
6
7
8
1
5
2
3
4
6
7
8
1
5
2AI RTD
2AI TC
Abbreviations used
M+: Measuring line (positive)
M–: Measuring line (negative)
I
C+
: Constant-current line (positive)
I
C–
: Constant-current line (nega-
tive)
Isolated thermocou-
ples with external
compensation by
means of a resistance
thermometer connec-
ted to the 2AI RTD
(channel 0).
2AI RTD parameterized to the
Pt100 climatic measuring range
Figure 12-3 Compensation by Means of the 2AI RTD
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