Siemens S7-1200 - Thermocouple and RTD Signal Modules (Sms); SM 1231 Thermocouple

Technical specifications
A.9 Thermocouple and RTD signal modules (SMs)
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
919
A.9
Thermocouple and RTD signal modules (SMs)
A.9.1
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
Order number
6ES7 231-5QD32-0XB0
6ES7 231-5QF32-0XB0
Dimensions W x H x D (mm)
45 x 100 x 75
45 x 100 x 75
Weight
180 grams
190 grams
Power dissipation
1.5 W
1.5 W
Current consumption (SM Bus)
80 mA
80 mA
Current consumption (24 VDC)
1
40 mA
40 mA
1
20.4 to 28.8 VDC (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 923).
See Thermocouple selection table
(Page 923).
Resolution
Temperature
0.1 °C/0.1 °F
0.1 °C/0.1 °F
Voltage 15 bits plus sign 15 bits plus sign
Maximum withstand voltage ± 35 V ± 35 V
Noise rejection 85 dB for selected filter setting
(10 Hz, 50 Hz, 60 Hz or 400 Hz)
85 dB for selected filter setting
(10 Hz, 50 Hz, 60 Hz or 400 Hz)
Common mode rejection > 120 dB at 120 VAC > 120 dB at 120 VAC
Impedance ≥ 10 MΩ ≥ 10 MΩ
Isolation
Field to logic
500 VAC
500 VAC
Field to 24 VDC
500 VAC
500 VAC
24 VDC to logic
500 VAC
500 VAC
Channel to channel
120 VAC
120 VAC
Accuracy See Thermocouple selection table
(Page 923).
See Thermocouple selection table
(Page 923).
Repeatability
±0.05% FS
±0.05% FS
Measuring principle
Integrating
Integrating
Module update time See Noise reduction selection table
(Page 923).
See Noise reduction selection table
(Page 923).
Cold junction error
±1.5 °C
±1.5 °C