Analog Modules
5-51
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Four-Conductor Connection of a Resistance Thermometer
The voltage generated at the resistance thermometer is measured via the M+ and
Mterminals. When you connect, watch out for the polarity of the connected cable
(connect IC + and M+ as well as IC – and M– to the resistance thermometer).
Make sure that the connected cables IC + and M+ and SO and SE+ and cables
IC – and M– and AGND and SE– are connected directly on the resistance
thermometer.
IC
M+
M
IC+
IC–
SE+
SE–
SO
AGND
Figure 5-14 Four-Conductor Connection of Resistance Thermometers on an AI