User Manual

Technical specifications
A.8 RTD and Thermocouple modules
Easy Book
Manual, 03/2014, A5E02486774-AF
323
Table A- 52 Wiring diagrams for the TC SMs
SM 1231 AI 4 x 16 bit TC
SM 1231 AI 8 x 16 bit TC
① SM 1231 AI 8 TC: For clarity, TC 2, 3, 4, and 5 are not shown connected.
A.8.4
Analog input specifications for RTD and TC (SM and SB)
Table A- 53 Analog inputs for the RTD and TC modules (SB and SM)
Technical data
RTD and Thermocouple (TC)
Number of inputs 1 (SB), 4 or 8 (SM)
Type
• RTD: Module referenced RTD and Ω
• TC: Floating TC and mV
Range
• Nominal range (data word)
• Overshoot/undershoot range (data word)
• Overflow/underflow (data word)
See the RTD/TC type tables:
• RTD (Page 326)
• TC (Page 324)
Resolution
Temperature
0.1 °C / 0.1 °F
Resistance / 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 or 400 Hz)
Common mode rejection
> 120 dB at 120 VAC
Impedance
≥ 10 MΩ