Product Overview

The SIMATIC S7-1200 Analog Input Module SM 1231 provides cost-effective analog signal acquisition with 4 channels supporting both voltage and current inputs. Featuring 12-bit + sign resolution (13-bit ADC) and multiple input ranges, this compact module enables precise measurement of analog sensors without additional amplifiers.

Key Features

• 4 Analog Inputs: Compact multi-channel voltage and current signal acquisition
• Flexible Input Ranges: ±10V, ±5V, ±2.5V voltage and 0-20mA/4-20mA current
• High Resolution: 12-bit + sign (13-bit ADC) for precise measurements
• Direct Sensor Connection: No additional amplifiers required for most sensors
• Fast Conversion: Extremely short conversion times for real-time applications
• Compact Design: Standard 45mm width with DIN rail mounting

Technical Specifications

• Inputs: 4 analog channels with configurable voltage/current ranges
• Voltage Ranges: ±10V, ±5V, ±2.5V (differential inputs)
• Current Ranges: 0-20mA, 4-20mA (single-ended inputs)
• Resolution: 12-bit + sign bit (13-bit ADC)
• Accuracy: 0.1% typical for optimal measurement precision
• Dimensions: 45 × 100 × 75 mm (W × H × D) | Weight: 0.152 kg
• Power Consumption: Optimized for 4-channel operation from CPU backplane

Input Configuration

Voltage Inputs:

• ±10V: Standard industrial range for transmitters and sensors
• ±5V: Medium range for precision applications
• ±2.5V: High-resolution range for sensitive measurements

Current Inputs:

• 0-20mA: Full-scale current loop for sensors and transmitters
• 4-20mA: Live-zero current loop with wire-break detection capability

Channel Features:

• Individual channel configuration for mixed voltage/current applications
• Differential inputs for voltage measurements
• Common mode rejection for noise immunity

Applications & Integration

Primary Applications:

• Small to medium-scale process control with analog sensors
• Temperature, pressure, flow, and level measurement systems
• Industrial automation with 4-20mA transmitters
• Data acquisition from analog field devices
• Cost-effective solutions requiring fewer analog inputs

System Compatibility:

• All S7-1200 CPU series (except CPU 1211C - requires expansion capability)
• TIA Portal configuration with STEP 7 Basic programming
• Hot-swappable installation with up to 8 modules per CPU
• Automatic scaling and engineering unit conversion

Installation & Configuration

• DIN Rail Mounting: Snap-on installation next to CPU with integrated connections
• TIA Portal Integration: Simple hardware catalog configuration
• Wiring: Screw terminals for secure field connections
• Diagnostic Features: Channel-specific fault detection and status monitoring
• Function Blocks: Pre-configured analog input processing libraries

Quality & Compliance

• Status: Active Product (PM300) | Origin: Germany
• EAN: 6940408102033 | UPC: 887621206963
• RoHS Compliant: Since 15.03.2013 | 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 Analog Input Module (4 AI), technical documentation, DIN rail hardware

Download existing graphical data for this product:

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