Siemens SIMATIC S7 System Manual page 735
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Table A- 136 Analog inputs
Technical data
Number of inputs
Type
Range
Nominal range (data word)
Overrange/underrange (data word)
Overflow/underflow (data word)
Resolution
Temperature
Voltage
Maximum withstand voltage
Noise rejection
Common mode rejection
Impedance
Accuracy (25°C / 0 to 55°C)
Repeatability
Measuring principle
Module update time
Cold junction error
Isolation (field side to logic)
Cable length (meters)
Wire resistance
Table A- 137 Diagnostics
Technical data
Overflow/underflow
1
Wire break
2
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.
When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report
2
random values.
The SM 1231 Thermocouple (TC) analog signal module measures the value of voltage
connected to the module inputs.
The SB 1231 Thermocouple analog signal board measures the value of voltage connected
to the signal board inputs. The temperature measurement type can be either
"Thermocouple" or "Voltage".
● "Thermocouple": The value will be reported in degrees multiplied by ten (for example,
● "Voltage": The nominal range full scale value will be decimal 27648.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
25.3 degrees will be reported as decimal 253).
SB 1231 AI 1x16 bit Thermocouple
1
Floating TC and mV
See Thermocouple filter selection table (Page 736).
0.1° C / 0.1° F
15 bits plus sign
±35 V
85 dB for the selected filter setting
(10 Hz, 50 Hz, 60 Hz, 400 Hz)
> 120 dB at 120 VAC
≥ 10 M Ω
See Thermocouple selection table (Page 736).
±0.05% FS
Integrating
See Thermocouple filter selection table (Page 736).
±1.5° C
500 VAC
100 m to sensor max.
100 Ω max.
SB 1231 AI 1 x 16 bit Thermocouple
Yes
Yes
553BTechnical specifications
A.9 Analog signal boards (SBs)
735
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