Siemens SIMATIC S7 System Manual page 739
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Table A- 142 Analog inputs
Technical data
Number of inputs
Type
Range
Nominal range (data word)
Overrange/underrange (data word)
Overflow/underflow (data word)
Resolution
Maximum withstand voltage
Noise rejection
Common mode rejection
Impedance
Accuracy (25°C / 0 to 55°C)
Repeatability
Maximum sensor dissipation
Measuring principle
Module update time
Isolation (field side to logic)
Cable length (meters)
Wire resistance
Table A- 143 Diagnostics
Technical data
Overflow/underflow
1, 2
Wire break
3
The overflow and underflow diagnostic alarm information will be reported in the analog data values even if the alarms
1
are disabled in the module configuration.
For resistance ranges underflow detection is never enabled.
2
When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report
3
random values.
The SM 1231 RTD analog signal board measures the value of resistance connected to the
signal board inputs. The measurement type can be selected as either "Resistor" or "Thermal
resistor".
● "Resistor": The nominal range full scale value will be decimal 27648.
● "Thermal resistor": The value will be reported in degrees multiplied by ten (for example,
The SB 1231 RTD signal board supports measurements with 2-wire, 3-wire and 4-wire
connections to the sensor resistor.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
Temperature
Voltage
25.3 degrees will be reported as decimal 253).
SB 1231 AI 1 x 16 bit RTD
1
Module referenced RTD and Ohms
See Selection tables (Page 740).
0.1° C/ 0.1° F
15 bits plus sign
±35 V
85 dB (10 Hz, 50 Hz, 60 Hz, 400 Hz)
> 120 dB
≥ 10 MΩ
See Selection tables (Page 740).
±0.05% FS
0.5 m W
Integrating
See Selection table (Page 740).
500 VAC
100 m to sensor max.
20 Ω, 2.7 for 10 Ω RTD max.
SB 1231 AI 1 x 16 bit RTD
Yes
Yes
553BTechnical specifications
A.9 Analog signal boards (SBs)
739
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