Siemens SIMATIC S7-1200 - Page 1512

Technical specifications
A.14 Analog signal boards (SBs)
S7-1200 Programmable controller
1512 System Manual, V4.2, 09/2016, A5E02486680-AK
Technical data
SB 1231 AI 1x12 bit
Input impedance
Differential
Common mode
Voltage: 220 kΩ; Current: 250 Ω
Voltage: 55 kΩ; Current: 55 kΩ
Behavior on RUN to STOP Last value or substitute value (default value 0)
Measuring principle
Actual value conversion
Common mode rejection
40 dB, DC to 60 Hz
Operational signal range Signal plus common mode voltage must be less than +35 V and
greater than -35 V
Isolation (field side to logic)
None
Cable length (meters)
100 m, twisted and shielded
Table A- 208 Diagnostics
Technical data
SB 1231 AI 1 x 12 bit
Overflow/underflow
Yes
24 V DC low voltage
no
SB 1231 wiring current transducers
Wiring current transducers are available as 2-wire transducers and 4-wire transducers as
shown below.