Siemens 6ES7231-5QD32-0XB0 SM 1231 TC Analog Input Module
Siemens SM 1231 TC analog input module, 6ES7231-5QD32-0XB0, 8 thermocouple inputs, ±80 mV range, 24 V DC, active production.
Specifications
| Parameter | Value |
|---|---|
| Number of analog inputs | 4; Thermocouples |
| Current input range | No |
| Voltage input range | Yes |
| Resistance measuring ranges | No |
| RTD support (resistance thermometer) | No |
| Thermocouple support (types) | Yes; J, K, T, E, R, S, N, C, TXK/XK(L); voltage range: ±80 mV |
| Input range: -80 to +80 mV | Yes |
| Permissible input voltage, max. (destruction limit) | ±35 V |
| Parameter | Value |
|---|---|
| Resolution (bit incl. sign), max. | 15 bit; + sign |
| Measurement principle | integrating |
| Temperature measurement error (±) | 25 °C ±0.1%, to 55 °C ±0.2% total measurement range |
| Interference voltage suppression (at interference frequency) | 85 dB at 50 / 60 / 400 Hz |
| Common-mode interference suppression, min. | 120 dB |
| Parameter | Value |
|---|---|
| Wire-break detection | Yes |
| Diagnostic alarm | Yes |
| Diagnostics function | Yes; Can be read out |
| Supply voltage monitoring | Yes |
| Parameter | Value |
|---|---|
| Rated value (DC) | 24 V |
| Power loss, typ. | 1.5 W |
| Parameter | Value |
|---|---|
| Operating temperature, horizontal mounting, max. | 60 °C |
| Operating temperature, horizontal mounting, min. | -20 °C |
| Operating temperature, vertical mounting, max. | 50 °C |
| Operating temperature, vertical mounting, min. | -20 °C |
| Parameter | Value |
|---|---|
| Required front connector | Yes |
| Width | 45 mm |
| Height | 100 mm |
| Depth | 75 mm |
| Weight, approx. | 180 g |
Product details
Frequently asked questions
What thermocouple types does 6ES7231-5QD32-0XB0 support?
Supports types J, K, T, E, R, S, N, and C, with a voltage range of ±80 mV. The thermocouple type is parameterizable per channel.
Thermocouple input module for S7-1200
The Siemens 6ES7231-5QD32-0XB0 is an SM 1231 TC analog input module for the S7-1200 controller family. It accepts eight thermocouple inputs across types J, K, T, E, R, S, N, and C, with a voltage range of ±80 mV per the datasheet. The module is parameterizable — you configure the thermocouple type, wire-break detection, and diagnostic alarms per channel in the TIA Portal hardware config.
Operating environment and approvals
The 24 V DC supply draws a typical 1.5 W — negligible thermal load inside a crowded enclosure. Dimensions are 45 mm wide by 100 mm high by 75 mm deep, fitting the standard S7-1200 DIN-rail footprint with no extra clearance needed on the sides. Carries CE, cULus, UL, CSA, FM, KC, and marine approvals — covers most industrial and marine classification society requirements without a separate certification run.