Analog Modules
4-57
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Four-conductor connection
With a four-conductor connection, you must not connect the fourth conductor
(the conductor is not used at all, see Figure 4-21).
Backplane
bus
4th conductor
not connected
M+
M–
ADC
S–
Logic
Figure 4-21 Four-Conductor Connection of Resistance Thermometers to the SM 331;
AI 8 x 13 bits
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