Siemens SIMATIC S7-1200 System Manual page 1474

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Table of Contents

Technical specifications

A.11 Thermocouple and RTD signal modules (SMs)

Table A- 165 Diagnostics

Overflow/underflow

24 V DC low voltage

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.

When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report ran-

The module performs wire break testing every 6 seconds, which extends the update time by 9 ms for each enable

channel once every 6 seconds.

The SM 1231 Thermocouple (TC) analog signal module measures the value of voltage

connected to the module inputs. The temperature measurement type can be either

"Thermocouple" or "Voltage".

● "Thermocouple": The value will be reported in degrees multiplied by ten (for example, 25.3

degrees will be reported as decimal 253).

● "Voltage": The nominal range full scale value will be decimal 27648.

Table A- 166 Wiring diagrams for the thermocouple SMs

SM 1231 AI 4 x TC 16 bit (6ES7231-5QD32-0XB0)

Note: Connectors must be gold. See Appendix C, Spare Parts for article number.

TC 2, 3, 4, and 5 not shown connected for clarity.

SM 1231 AI 4 x 16 bit TC

SM 1231 AI 8 x TC bit (6ES7231-5QF32-0XB0)

SM 1231 AI 8 x 16 bit TC

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK