Product Overview

SIMATIC S7-300 Analog Input SM 331, Isolated, 8 AI; ±5/10V, 1-5V, ±20mA, 0/4 to 20mA, 16 bit (55ms), Single rooting (50V COM.), 1x 40-pole

This high-performance analog input module is designed for SIMATIC S7-300 automation systems, providing eight optically isolated analog input channels with 16-bit resolution. The module supports both voltage and current measurement types with programmable ranges per channel group, making it ideal for precision measurement applications in industrial automation environments.

Key Features

• Input Channels: 8 analog inputs arranged in 4 channel groups (2 inputs per group)
• Resolution: 16 bits (15 bits + sign) for high-precision measurements
• Isolation: Optically isolated channels with galvanic separation
• Measurement Types: Configurable voltage and current inputs per channel group
• Conversion Time: 55ms integration time for stable measurements
• Single Rooting: 50V common reference point for simplified wiring
• Connection: 1x 40-pole connector for comprehensive signal connections
• Hot Configuration: Supports parameter reassignment in RUN mode

Technical Specifications

• Article Number: 6ES7331-7NF00-0AB0
• Number of Analog Inputs: 8 channels (4 channel groups)
• Resolution: 16 bits (15 bits + sign)
• Integration Time: 55ms for noise filtering
• Voltage Input Ranges: ±5V, ±10V, 1-5V configurable per channel group
• Current Input Ranges: ±20mA, 0-20mA, 4-20mA configurable per channel group
• Common Reference: Single rooting with 50V common point
• Connection Type: 40-pole connector
• Net Weight: 0.311 kg
• Packaging Dimensions: 12.80 x 15.20 x 5.20 cm
• Country of Origin: Germany
• EAN: 4025515061212
• UPC: 662643177923

Signal Characteristics

• Voltage Measurement: ±5V, ±10V, 1-5V ranges with high input impedance
• Current Measurement: ±20mA, 0-20mA, 4-20mA ranges with internal sense resistors
• Input Impedance: Optimized for standard industrial sensors
• Common Mode Voltage: 50V maximum for single rooting configuration
• Accuracy: High precision suitable for demanding measurement applications
• Temperature Drift: Minimal drift over operating temperature range

Compliance & Certifications

• RoHS Compliance: Compliant since 31.03.2008
• WEEE Directive: Take-back obligation applicable
• Export Control: AL: N / ECCN: 9N9999
• Product Lifecycle: PM400 - Announcement of product phase-out (since 01.10.2023)
• Product Class: Standard product with return capability within guidelines

Environmental & Safety Information

• This product contains substances of very high concern (SVHC) as per REACH Article 33:
• Lead - concentration >0.1% w/w
• Lead monoxide (lead oxide) - concentration >0.1% w/w
• These substances are not expected to pose risks when used as intended, including proper disposal.

Programmable Features

• Measurement Type: Configurable voltage or current measurement per channel group
• Measuring Range: Individual range selection per channel group
• Resolution: Programmable resolution settings for each channel group
• Diagnostics: Programmable diagnostics and diagnostic interrupt capabilities
• Limit Monitoring: Programmable limit value monitoring for fault detection
• Hardware Interrupts: Configurable interrupts for limit violations and diagnostics

Applications

• Process control systems requiring high-precision analog measurements
• Temperature monitoring and control with RTD and thermocouple sensors
• Flow measurement and control systems
• Pressure and level monitoring applications
• Quality control and testing equipment
• HVAC systems and building automation
• Chemical and pharmaceutical process monitoring
• Industrial weighing and batching systems

Diagnostic Features

• Group Diagnostics: Comprehensive diagnostic information per channel group
• Limit Interrupts: Programmable limit value monitoring with interrupt generation
• Diagnostic Interrupts: Configurable diagnostic interrupts for fault conditions
• Wire Break Detection: Automatic detection of sensor wire breaks
• Overrange Detection: Automatic detection of input signal overrange conditions
• System Integration: Full integration with SIMATIC diagnostic systems

Installation Benefits

• Optically Isolated: Enhanced noise immunity and safety through galvanic isolation
• Flexible Configuration: Software-configurable measurement types and ranges
• Single Rooting: Simplified wiring with common reference point
• High-Speed Updates: Fast measurement updates for real-time control
• Parameter Reassignment: Runtime parameter changes without system shutdown
• Compact Design: Space-efficient design fits standard S7-300 configurations

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Technical Datasheet

Product Information

SM 331 Analog Input Modules Family