Siemens SIMATIC S7 System Manual page 701
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Table A- 76
Analog inputs
Model
Number of inputs
Type
Range
Full scale range (data word)
Overshoot/undershoot range
(data word)
Overflow/underflow (data word)
Resolution
Maximum withstand voltage/current
Smoothing
Noise rejection
Input impedance
Isolation (field side to logic)
Accuracy (25°C / 0 to 55°C)
Measuring principle
Common mode rejection
Operational signal range
Cable length (meters)
Table A- 77
Diagnostics
Model
Overflow/underflow
24 VDC low voltage
For SM 1231 AI 4 x 13 bit: If a voltage greater than +30 VDC or less than -15 VDC is applied to the input, the resulting
1
value will be unknown and the corresponding overflow or underflow may not be active.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
SM 1231 AI 4 x 13 bit
4
Voltage or current (differential): Selectable in groups of 2
±10 V, ±5 V, ±2.5 V, or 0 to 20 mA
-27,648 to 27,648
Voltage: 32,511 to 27,649 / -27,649 to -32,512
Current: 32,511 to 27,649 / 0 to -4864
Refer to the section on analog input ranges for voltage and current
(Page 708).
Voltage: 32,767 to 32,512 / -32,513 to -32,768
Current: 32,767 to 32,512 / -4865 to -32,768
Refer to the section on input ranges for voltage and current (Page 708).
12 bits + sign bit
±35 V / ±40 mA
None, weak, medium, or strong
Refer to the section on step response times (Page 707).
400, 60, 50, or 10 Hz
Refer to the section on sample rates (Page 707).
≥ 9 MΩ (voltage) / 280 Ω (current)
None
±0.1% / ±0.2% of full scale
Actual value conversion
40 dB, DC to 60 Hz
Signal plus common mode voltage must be less than +12 V and greater
than -12 V
100 m, twisted and shielded
SM 1231 AI 4 x 13 bit
Yes
1
Yes
553BTechnical specifications
A.6 Analog signal modules (SMs)
SM 1231 AI 8 x 13 bit
8
SM 1231 AI 8 x 13 bit
Yes
Yes
701
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