Siemens SIMATIC S7-1200

Technical specifications
A.11 Thermocouple and RTD signal modules (SMs)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1473
A.11
Thermocouple and RTD signal modules (SMs)
A.11.1
SM 1231 Thermocouple
Table A- 163 General specifications
Model
SM 1231 AI 4 x 16 bit TC
SM 1231 AI 8 x 16 bit TC
Article number
6ES7231-5QD32-0XB0
6ES7231-5QF32-0XB0
Dimensions W x H x D (mm) 45 x 100 x 75
Weight
180 grams
190 grams
Power dissipation 1.5 W
Current consumption (SM Bus)
80 mA
Current consumption (24 V DC)
1
40 mA
1
20.4 to 28.8 V DC (Class 2, Limited Power, or sensor power from PLC)
Table A- 164 Analog inputs
Model
SM 1231 AI 4 x 16 bit TC
SM 1231 AI 8 x 16 bit TC
Number of inputs
4
8
Range
Nominal range (data word)
Overrange/underrange (data word)
Overflow/underflow (data word)
See Thermocouple selection table (Page 1477).
Resolution
Temperature
0.1 °C/0.1 °F
Voltage
15 bits plus sign
Maximum withstand voltage
± 35 V
Noise rejection
85 dB for selected filter setting (10 Hz, 50 Hz, 60 Hz or 400 Hz)
Common mode rejection
> 120 dB at 120 V AC
Impedance
≥ 10 MΩ
Isolation
Field to logic
707 VDC (type test)
Field to 24 V DC
707 V DC (type test)
24 V DC to logic
707 V DC (type test)
Channel to channel 120 V AC
Accuracy
See Thermocouple selection table (Page 1477).
Repeatability ±0.05% FS
Measuring principle
Integrating
Module update time
See Noise reduction selection table (Page 1477).
Cold junction error
±1.5 °C
Cable length (meters)
100 meters to sensor max.
Wire resistance
100 Ω max.