Siemens SIMATIC S7-1200

Technical specifications
A.8 RTD and Thermocouple modules
Easy Book
320 Manual, 03/2014, A5E02486774-AF
Technical data
SM 1231 AI 4 x RTD x 16 bit
SM 1231 AI 8 x RTD x 16 bit
Number of inputs (Page 323)
Type
4
Module-referenced RTD and Ω
8
Module-referenced RTD and Ω
Diagnostics
• Overflow / underflow
2,3
• 24 VDC low voltage
2
• Wire break (current mode only)
4
• Overflow / underflow
2,3
• 24 VDC low voltage
2
• Wire break (current mode only)
4
1
20.4 to 28.8 VDC (Class 2, Limited Power, or sensor power from CPU)
2
The overflow, underflow and low voltage diagnostic alarm information will be reported in the analog data values even if
the alarms are disabled in the module configuration.
3
For resistance ranges underflow detection is never enabled.
4
When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report
random values.