Product Overview

The SIMATIC S7-1200 Analog Input Module SM 1231 RTD provides high-precision temperature measurement with 8 RTD (Resistance Temperature Detector) inputs. Supporting Pt100/Pt1000 platinum sensors and 16-bit resolution, this module delivers accurate temperature monitoring for industrial automation and process control applications.

Key Features

• 8 RTD Channels: Multi-point temperature measurement with 16-bit resolution
• RTD Sensor Support: Pt100, Pt1000 platinum resistance thermometers, copper and nickel RTDs
• High Precision: 16-bit analog-to-digital conversion for accurate measurements
• Direct Connection: No additional amplifiers required for RTD sensors
• Advanced Diagnostics: Open wire detection and sensor fault monitoring
• Wide Temperature Range: Suitable for industrial process temperature applications

Technical Specifications

• Inputs: 8 RTD channels, 16-bit resolution
• Sensor Types: Pt100, Pt1000, copper and nickel resistance thermometers
• Dimensions: 70 × 100 × 75 mm (W × H × D) | Weight: 0.283 kg
• Power Consumption: 1.5W, 90mA (SM Bus), 40mA (24V DC)
• Connection: Screw/spring clamp terminals
• Protection: IP20 | Mounting: DIN rail with integrated slide mechanism

RTD Sensor Compatibility

Platinum RTDs:

• Pt100: Most common industrial standard (100Ω at 0°C)
• Pt1000: Higher resolution variant (1000Ω at 0°C)

Alternative RTD Types:

• Copper RTDs: Cost-effective temperature sensing
• Nickel RTDs: Specialized industrial applications

Temperature Ranges:

• Depends on RTD type and configuration
• High accuracy across wide temperature spans
• Suitable for process control and monitoring

Applications & Integration

Primary Applications:

• Industrial process temperature control and monitoring
• HVAC systems and building automation
• Chemical and pharmaceutical processes
• Food and beverage temperature control
• Power generation and energy systems

System Compatibility:

• All S7-1200 CPU series (1211C, 1212C, 1214C, 1215C, 1217C)
• TIA Portal configuration with STEP 7 Basic programming
• Hot-swappable installation with up to 8 modules per CPU
• Automatic temperature scaling and built-in diagnostics

Installation & Configuration

• DIN Rail Mounting: Snap-on installation next to CPU with integrated connections
• TIA Portal Integration: Simple hardware catalog configuration
• Wiring Options: 2-wire, 3-wire, or 4-wire RTD connections
• Diagnostic Features: Open circuit detection and sensor monitoring
• Function Blocks: Pre-configured temperature measurement libraries

Quality & Compliance

• Status: Active Product (PM300) | Origin: China
• EAN: 6940408101883 | UPC: 887621549800
• RoHS Compliant: Since 30.08.2013 | WEEE: Take-back obligation applies
• REACH: Contains lead, lead oxide, and BPA above 0.1% w/w (safe when used as intended)

Package Contents

• 1 × SM 1231 RTD Module (8 AI), technical documentation, DIN rail hardware

Download existing graphical data for this product:

• Technical Datasheet
• Product Information Page
• SM 1231 RTD Product Family
• TIA Portal Documentation
• Product Support Portal