Product Overview

SIMATIC S7-1200 SM 1231 RTD Signal Module – 8× Analog Inputs
The 6ES7231-5PF32-0XB0 module seamlessly integrates resistance thermometer (RTD) measurements into the S7-1200 automation platform. It offers eight independent RTD inputs with built-in support for a variety of RTD types, making it ideal for precise temperature monitoring across industrial control systems.
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Technical Specifications

Power Supply & Consumption

Rated supply voltage: 24 V DC

Current consumption: ~40 mA, plus ~80 mA from the 5 V backplane bus

Power loss: ~1.5 W
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Analog Inputs (RTD)

Channels: 8 RTD inputs

Supported RTD elements: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000; Ni100, Ni120, Ni200, Ni500, Ni1000; Cu10, Cu50, Cu100; and LG-Ni1000

Also accepts fixed resistances: 150 Ω, 300 Ω, 600 Ω
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Signal Conditioning & Accuracy

Measuring principle: Integrating converter

Resolution: up to 15-bit + sign

Interference suppression: 85 dB at 50/60/400 Hz

Repeat accuracy: ±0.05 % in steady-state at 25 °C

Temperature error range: ±0.1 % at 25 °C rising to ±0.2 % at 55 °C of full scale
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Diagnostics & Functionality

Includes wire-break detection and monitoring of input integrity

I&M (I&M0–I&M3) support and LED status indicators for ease of diagnostics
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Physical & Mechanical Details

Dimensions: 70 mm (W) × 100 mm (H) × 75 mm (D)

Weight: ~220 g

Protection rating: IP20
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Environmental Conditions

Operating temperature: –20 °C to +60 °C (horizontal); up to +50 °C when vertically mounted

Storage/transport temperature: –40 °C to +70 °C

Suitable for up to 95 % relative humidity, non-condensing

Designed for rugged industrial environments
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Lifecycle, Logistics & Compliance

Product Status: Active (PLM: PM300)

Lead Time: Ships ex-works in 1 day
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Logistics:

Net weight: 0.283 kg

Packaging dimensions: 8.80 × 10.90 × 8.50 cm

Origin: China
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Regulations & Standards:

RoHS compliant since 30 August 2013

WEEE: Take-back obligation applies

REACH (Article 33) compliant: contains Lead and Lead Monoxide above 0.1 % w/w—safe when used/disposed as intended
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Engineering Insights

Versatile RTD Support
Extensive input compatibility (Pt, Ni, Cu, LG-Ni types) enables flexible deployment in diverse thermal measurement applications, from process control to environmental monitoring.

High Precision & Reliability
With a 15-bit resolution and tight accuracy specifications, this module delivers precise, stable temperature readings—essential for controlled automation environments.

Smart Diagnostics & Maintenance
Built-in wire-break detection and LED indicators simplify fault isolation, while I&M data integration supports advanced system diagnostics.

Compact & Space-Efficient
Slim form factor and lightweight build facilitate convenient installation in dense S7-1200 system racks.

Robust Design for Real-World Use
IP20-rated housing and wide temperature tolerance ensure durability and performance in a variety of industrial settings.

Suggested Product Page Description

SIMATIC S7-1200 Analog Input Module SM 1231 – 8× RTD Channels (6ES7231-5PF32-0XB0)

Achieve reliable and accurate temperature measurement in your automation setup with this high-resolution RTD module designed for the S7-1200 system. It supports eight RTD inputs with diverse sensor compatibility, high accuracy, built-in diagnostics, and industry-grade resilience.

Key Features

8 RTD input channels (Pt, Ni, Cu, LG types, plus standard resistances)

High-precision 15-bit analog conversion with low thermal error

Diagnostics: wire-break detection, LED indicators, I&M integration

Compact: 70 × 100 × 75 mm, ~220 g, IP20 rated

Logistics & Compliance

Ships next-day from China factory

RoHS, WEEE, REACH compliant