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Analog modules
5.12 Connecting resistance thermometers and resistors
S7-400 Automation System Module Data
230 Reference Manual, Edition 09/2009, A5E00850736-06
2-conductor connection of a resistance thermometer
For 2-conductor connections, bridge the M
+
and I
C+
, and the M
-
and I
C-
terminals of the
module.
Note: Cable resistance is also measured.
M+
M-
I
C+
I
C-
I
C+
Constant current line (positive)
I
C-
Constant current line (negative)
M
+
Measuring line (positive)
M
-
Measuring line (negative)
Figure 5-14 2-conductor connection of a resistance thermometer to an electrically isolated analog
input
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