Siemens S7-300 Installation And Operating Manual page 196

Analog modules
9.2 SM 336; AI 6 x 13 Bit
Wiring scheme A, current measurement 4 to 20 mA with 2-wire transducer for application 2
You can interconnect six process signals with two redundant analog modules. Two sensors
are connected via one channel to the two analog modules for each process signal. Sensor
supply V
connected to an external sensor supply (see figure
for SM 336; AI 6 x 13Bit
(Page 184)").
196
is provided by the analog module for 6 channels. The sensors can also be
S
in chapter "Properties, front view, wiring diagram and block diagram
External sensor supply, 2-wire transducer
Installation and Operating Manual, 01/2010, A5E00085586-10
Fail-safe signal modules