Siemens SIMATIC S7 System Manual page 710
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553BTechnical specifications
A.7 Thermocouple and RTD signal modules (SMs)
Table A- 94
Analog inputs
Model
Number of inputs
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
Isolation
Field to logic
Field to 24 VDC
24 VDC to logic
Channel to channel
Accuracy (25°C / 0 to 55°C)
Repeatability
Measuring principle
Module update time
Cold junction error
Cable length (meters)
Wire resistance
Table A- 95
Diagnostics
Model
Overflow/underflow
1
Wire break (current mode only)
24 VDC low voltage
1
The overflow, underflow and low voltage diagnostic alarm information will be reported in the analog data values even if
1
the alarms 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.
710
SM 1231 AI 4 x 16 bit TC
4
See Thermocouple selection table
(Page 712).
0.1° C/0.1° F
15 bits plus sign
± 35 V
85 dB for selected filter setting
(10 Hz, 50 Hz, 60 Hz or 400 Hz)
> 120 dB at 120 VAC
≥ 10 MΩ
500 VAC
500 VAC
500 VAC
120 VAC
See Thermocouple selection table
(Page 712).
±0.05% FS
Integrating
See Noise reduction selection table
(Page 712).
±1.5°C
100 meters to sensor max.
100 Ω max.
SM 1231 AI 4 x 16 bit TC
Yes
Yes
2
Yes
SM 1231 AI 8 x 16 bit TC
8
See Thermocouple selection table
(Page 712).
0.1° C/0.1° F
15 bits plus sign
± 35 V
85 dB for selected filter setting
(10 Hz, 50 Hz, 60 Hz or 400 Hz)
> 120 dB at 120 VAC
≥ 10 MΩ
500 VAC
500 VAC
500 VAC
120 VAC
See Thermocouple selection table
(Page 712).
±0.05% FS
Integrating
See Noise reduction selection table
(Page 712).
±1.5°C
100 meters to sensor max.
100 Ω max.
SM 1231 AI 8 x 16 bit TC
Yes
Yes
Yes
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
- Quick Links:
- Introducing the S7-1200 Plc
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