Siemens S7-1200 - Page 908

Technical specifications
A.8 Analog signal modules (SMs)
S7-1200 Programmable controller
908 System Manual, 03/2014, A5E02486680-AG
Model
SM 1231 AI 4 x 13 bit
SM 1231 AI 8 x 13 bit
SM 1231 AI 4 x 16 bit
Isolation
Field side to logic
Logic to 24 VDC
Field side to 24 VDC
Channel to channel
None
500 VAC
500 VAC
500 VAC
None
Accuracy (25 °C / -20 to 60 °C)
±0.1% / ±0.2% of full scale
±0.1% / ±0.3% of full scale
Measuring principle
Actual value conversion
Common mode rejection
40 dB, DC to 60 Hz
Operational signal range
1
Signal plus common mode voltage must be less than +12 V and greater than -12 V
Cable length (meters)
100 m, twisted and shielded
1
Voltages outside the operational range applied to one channel may cause interference on other channels.
Table A- 139 Diagnostics
Model
SM 1231 AI 4 x 13 bit
SM 1231 AI 8 x 13 bit
SM 1231 AI 4 x 16 bit
Overflow/underflow
Yes
Yes
Yes
24 VDC low voltage
Yes
Yes
Yes
Open wire 4 to 20 mA range only (if input is below -4164; 1.185 mA)
Table A- 140 Wiring diagrams for the analog input SMs
SM 1231 AI 4 x 13 bit (6ES7 231-4HD32-0XB0)
SM 1231 AI 8 x 13 bit (6ES7 231-4HF32-0XB0)
Note: Connectors must be gold. See Appendix C, Spare Parts for order number.