Siemens SIMATIC S7-1200

Technical specifications
A.8 RTD and Thermocouple modules
Easy Book
322 Manual, 03/2014, A5E02486774-AF
Model
SM 1231 AI 4 x 16 bit TC
SM 1231 AI 8 x 16 bit TC
Number of inputs (Page 323)
Type
4
Floating TC and mV
8
Floating TC and mV
Diagnostics
• Overflow / underflow
2
• 24 VDC low voltage
2
• Wire break (current mode only)
3
• Overflow / underflow
2
• 24 VDC low voltage
2
• Wire break (current mode only)
3
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
When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report
random values.