Sm 1231 Rtd Specifications - Siemens SIMATIC S7-1200 Manual

Technical specifications
A.7 RTD and Thermocouple modules
A.7.2

SM 1231 RTD specifications

Table A- 44 General specifications
Technical data
Order number
Dimensions
W x H x D (mm)
Weight
Power dissipation
Current consumption
(SM Bus)
Current consumption
1
(24 VDC)
Number of inputs (Page 266)
Type
Diagnostics
20.4 to 28.8 VDC (Class 2, Limited Power, or sensor power from CPU)
1
The overflow, underflow and low voltage diagnostic alarm information will be reported in the analog data values even if
2
the alarms are disabled in the module configuration.
For resistance ranges underflow detection is never enabled.
3
When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report
4
random values.
Table A- 45 Wiring diagrams for the RTD SMs
SM 1231 RTD 4 (16 bit)
264
SM 1231 AI 4 x RTD x 16 bit
6ES7 231-5PD30-0XB0
45 x 100 x 75
220 grams
1.5 W
80 mA
40 mA
4
Module-referenced RTD and Ω
Overflow / underflow
 2,3
24 VDC low voltage
 2
Wire break (current mode only)

SM 1231 RTD 8 (16 bit)
SM 1231 AI 8 x RTD x16 bit
6ES7 231-5PF30-0XB0
70 x 100 x 75
270 grams
1.5 W
90 mA
40 mA
8
Module-referenced RTD and Ω
Overflow / underflow

24 VDC low voltage

Wire break (current mode only)
4 
Manual, 11/2011, A5E02486774-04
2,3
2
4
References
①
Loop-back unused
RTD inputs
②
2-wire RTD
③
3-wire RTD
④
4-wire RTD
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