Siemens SIMATIC Manual page 330

Analog modules
6.5 Analog input module SM 331; AI 8 x 14 Bit High Speed; isochrone; (6ES7331-7HF0x-0AB0)
Terminal assignment
The diagrams below show the various wiring options.
Wiring: Voltage measurement
Figure 6-7 Block diagram and wiring diagram
Measuring range module settings
330
Measuring range
± 1V
± 5V
± 10V
1 V to 5V
Measuring range module setting
A
B
B (Default)
B
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ