Siemens S7-1200 SM 1231 Analog Input Modules: 6ES7231-5QF32-0XB0

Name: Siemens S7-1200 SM 1231 Analog Input Modules: 6ES7231-5QF32-0XB0
Brand: Siemens

Model: 6ES7231-5QF32-0XB0

Brand Siemens

Series S7-1200

Model 6ES7231-5QF32-0XB0

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Product Details And Specifications

Siemens S7-1200 SM 1231 Series Technical Notes

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A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

The Evolution of SM 1231 Architecture

The SM 1231 series was introduced alongside the S7-1200 CPU platform in 2009 as Siemens' response to demand for a modular, compact PLC with industrial-grade analog I/O. Early firmware revisions (V1.x) supported basic ±10 V and 0–20 mA ranges with 12-bit resolution. The V2.x generation extended channel count options and introduced thermocouple (TC) and RTD variants under the same SM 1231 designation, creating a unified analog input family. The V4.x TIA Portal integration brought on-board diagnostics, channel-level wire-break detection, and configurable filter time constants without external hardware. The 6ES7231-5QF32-0XB0 represents the mature 8-channel high-density variant, offering 16-bit resolution across all channels simultaneously — a specification that positions it as a direct competitor to distributed I/O heads in cost-sensitive applications. Compatibility is maintained across S7-1200 CPU 1211C, 1212C, 1214C, 1215C, and 1217C, with TIA Portal V13 SP1 and above required for full feature access. Legacy STEP 7 Basic is not supported.

SM 1231 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified SM 1231 and closely related S7-1200 analog input signal module range. Each entry reflects a distinct hardware configuration available for procurement, repair, or long-term maintenance stocking.

6ES7231-4HD32-0XB0: SM 1231 AI 4×13-bit analog input, ±10 V / 0–20 mA, standard density.
6ES7231-4HF32-0XB0: SM 1231 AI 8×13-bit analog input, ±10 V / 0–20 mA, high-density 8-channel.
6ES7231-5ND32-0XB0: SM 1231 AI 4×RTD, resistance temperature detector input, PT100/PT1000 compatible.
6ES7231-5ND32-0XB0: SM 1231 AI 4×TC, thermocouple input module, Type J/K/T/E/R/S/B/N support.
6ES7231-5PD32-0XB0: SM 1231 AI 4×TC thermocouple, extended type range, cold-junction compensation on-board.
6ES7231-5PF32-0XB0: SM 1231 AI 8×TC thermocouple, 8-channel high-density thermocouple input.
6ES7231-5QD32-0XB0: SM 1231 AI 4×RTD high-accuracy, 16-bit resolution, 4-wire RTD measurement.
6ES7231-5QF32-0XB0: SM 1231 AI 8×RTD/TC, 8-channel 16-bit analog input, voltage/current/RTD/TC universal input — this listing.
6ES7232-4HB32-0XB0: SM 1232 AQ 2×14-bit analog output, ±10 V / 0–20 mA, companion output module.
6ES7232-4HD32-0XB0: SM 1232 AQ 4×14-bit analog output, 4-channel high-density output.
6ES7234-4HE32-0XB0: SM 1234 AI 4×13-bit / AQ 2×14-bit combination I/O module.
6ES7221-1BF32-0XB0: SM 1221 DI 8×24 VDC digital input, commonly paired with SM 1231 in mixed I/O racks.
6ES7222-1BF32-0XB0: SM 1222 DQ 8×24 VDC digital output, standard companion discrete output.
6ES7223-1BH32-0XB0: SM 1223 DI 8×24 VDC / DQ 8×Relay combination digital I/O module.
6ES7241-1AH32-0XB0: CM 1241 RS422/485 communication module, serial interface for legacy device integration.
6ES7241-1CH32-0XB0: CM 1241 RS232 communication module, point-to-point serial communication.
6ES7288-3AE04-0AA0: S7-200 SMART EM AE04 analog input, cross-reference for legacy migration projects.

Sourcing Hard-to-Find & Obsolete SM 1231 Parts

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