Siemens S7-400PLC Spezifikationen Seite 229

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Analog modules
5.12 Connecting resistance thermometers and resistors
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
229
3-conductor connection of a resistance thermometer
With a 3-conductor connection to modules with 4 terminals per resistance thermometer, you
must set up a jumper between M-
and I
C
- and SE- and AGND
(see Figure).
The module compensates in this circuit for the effect of the line resistance between the
module and the resistance thermometer/resistor.
Make sure that the connected cables I
C
+ and M+ and SO and SE+ are directly connected to
the resistance thermometer.
To get an accurate measurement, make sure that the connected cables M+, I
C
+ and I
C
- and
SE+, SO and AGND are the same length and have the same cross-section.
I
C
M+
M-
I
C+
I
C-
SE+
SE-
SO
AGND
I
C+
Constant current line (positive)
I
C-
Constant current line (negative)
M
+
Measuring line (positive)
M
-
Measuring line (negative)
Figure 5-13 3-conductor connection of a resistance thermometer to an electrically isolated analog
input
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