Siemens S7-1200 - Page 914

Technical specifications
A.8 Analog signal modules (SMs)
S7-1200 Programmable controller
914 System Manual, 03/2014, A5E02486680-AG
Model
SM 1234 AI 4 x 13 bit / AQ 2 x 14 bit
Input impedance
≥ 9 MΩ (voltage) / 280 Ω (current)
Isolation (field side to logic)
None
Accuracy (25 °C / -20 to 60 °C)
±0.1% / ±0.2% of full scale
Analog to digital conversion time
625 μs (400 Hz rejection)
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- 153 Analog outputs
Technical data
SM 1234 AI 4 x 13 bit / AQ 2 x 14 bit
Number of outputs
2
Type
Voltage or current
Range
±10 V or 0 to 20 mA
Resolution
Voltage: 14 bits ; Current: 13 bits
Full scale range (data word) Voltage: -27648 to 27648; Current: 0 to 27648
Refer to the section on output ranges for voltage and current (Page 917).
Accuracy (25 °C / -20 to 60 °C)
±0.3% / ±0.6% of full scale
Settling time (95% of new value) Voltage: 300 μS (R), 750 μS (1 uF)
Current: 600 μS (1 mH), 2 ms (10 mH)
Load impedance Voltage: ≥ 1000 Ω
Current: ≤ 600 Ω
Behavior on RUN to STOP
Last value or substitute value (default value 0)
Isolation (field side to logic)
none
Cable length (meters)
100 m twisted and shielded
Table A- 154 Diagnostics
Model
SM 1234 AI 4 x 13 bit / AQ 2 x 14 bit
Overflow/underflow
Yes
Short to ground (voltage mode only)
Yes on outputs
Wire break (current mode only)
Yes on outputs
24 VDC low voltage
Yes