Siemens SIMATIC S7 System Manual page 729
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Table A- 123 Analog inputs
Technical data
Number of inputs
Type
Range
Resolution
Full scale range (data word)
Over/Under range (data word)
Overflow/Underflow (data word)
Maximum withstand voltage / current
Smoothing
Noise rejection
Accuracy (25°C / 0 to 55°C)
Input impedance
Differential
Common mode
Behavior on RUN to STOP
Measuring principle
Common mode rejection
Operational signal range
Isolation (field side to logic)
Cable length (meters)
Table A- 124 Diagnostics
Technical data
Overflow/underflow
24 VDC low voltage
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
SB 1231 AI 1x12 bit
1
Voltage or current (differential)
±10V, ±5V, ±2.5 or 0 to 20 mA
11 bits + sign bit
-27,648 to 27,648
Voltage: 32,511 to 27,649 / -27,649 to -32,512
Current: 32,511 to 27,649 / 0 to -4,864
(Refer to Analog input representation for voltage and Analog input
representation for current (Page 733).)
Voltage: 32,767 to 32,512 / -32,513 to -32,768
Current: 32,767 to 32,512 / -4,865 to -32,768
(Refer to Analog input representation for voltage and Analog input
representation for current (Page 733).)
±35V / ±40 mA
None, weak, medium, or strong (refer to Analog input response
times for step response time (Page 733).)
400, 60, 50, or 10 Hz (refer to Analog input response times for
sample rates (Page 733).)
±0.3% / ±0.6% of full scale
Voltage: 220 kΩ; Current: 250 Ω
Voltage: 55 kΩ; Current: 55 kΩ
Last value or substitute value (default value 0)
Actual value conversion
400 dB, DC to 60 Hz
Signal plus common mode voltage must be less than +35 V and
greater than -35 V
None
100 m, twisted and shielded
SB 1231 AI 1 x 12 bit
Yes
no
553BTechnical specifications
A.9 Analog signal boards (SBs)
729
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