Siemens SIMATIC Manual page 368

Analog modules
6.8 Analog input module SM 331; AI 2 x 12 Bit; (6ES7331-7KB02-0AB0)
Hardware interrupts
Hardware interrupts for channel groups can be programmed in
hardware interrupt only for the first channel of a channel group, that is channel 0.
Terminal assignment
The diagrams below show various wiring options The input impedance depends on
programmed measuring range.
Wiring: Voltage measurement
Figure 6-17
Measuring range module settings
368
Wiring and block diagram
Measuring range
± 80 mV
± 250 mV
± 500 mV
± 1,000 mV
± 2.5 V
± 5 V
1 V to 5 V
± 10 V
STEP 7
. However, set a
Measuring range module setting
A
B
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ