Siemens SIMATIC S7-300 Module data - Page 262

Analog Modules
4-56
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
4.11.1 Connecting resistance thermometers to the SM 331;
AI 8 x 13 bits
Two-conductor connection
With a two-conductor connection, you must insert jumpers on the module between
M– and S–.
Backplane
bus
M+
M–
ADC
S–
Logic
Figure 4-19 Two-conductor connection of resistance thermometers to the SM 331;
AI 8x 13 bits
Three-conductor connection
M+
M–
ADC
S–
Backplane
bus
Logic
Figure 4-20 Three-conductor connection of resistance thermometers to the SM 331;
AI 8 x 13 bits