Principles of analog value processing
4.5 Wiring and connecting resistance thermometers and resistors
S7-300 Module data
248 Manual, 06/2017, A5E00105505-AJ
3-wire connection of a resistance thermometer (not for 6ES7331-7PF01-0AB0)
When connecting 3-wire devices to modules equipped with four terminals, you should
generally
bridge M-
and I
C
-. Always wire and connect the connected
C
+ and M+ lines directly
to the resistance thermometer.
The image shows the basic wiring. Please observe the notes in the description about the
respective module.
Figure 4-10 3-wire connection of resistance thermometers to an electrically isolated analog input
2-wire connection of a resistance thermometerError! Bookmark not defined.
For 2-wire connections, insert a bridge between the M
+
and I
C+
and between the M-
and I
C
-
terminals of the module. The line impedance is included in the measurement.
Figure 4-11 2-wire connection of resistance thermometers to an electrically isolated analog input
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