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