PLC | Siemens | 6ES7331-1KF02-0AB0 6ES7 331-1KF02-0AB0 S7-300 Analog input SM 331

Product Description: 6ES7331-1KF02-0AB0

The 6ES7331-1KF02-0AB0 is an SM 331 analog-input module for the SIMATIC S7-300 PLC. It offers eight galvanically isolated, 4-wire inputs with 13-bit resolution, supporting 0 … 10 V or 0 / 4 … 20 mA signals. Plug-in mounting on the S7-300 backplane delivers seamless power and data exchange. With per- channel diagnostics and configurable filtering, it ensures accurate process measurements in machine and process control applications.

Key Features

• Eight isolated 4-wire analog inputs, configurable for voltage or current
• 13-bit A/D conversion for high-resolution measurement
• Input ranges: 0 … 10 V, 0 … 20 mA or 4 … 20 mA
• Per-channel diagnostics: open-circuit and overrange detection
• Configurable input filter times via STEP 7/TIA Portal
• Status LEDs for each channel and module health

Technical Specifications

• Channels: 8
• Input Types: 0 … 10 V; 0 … 20 mA; 4 … 20 mA
• Resolution: 13 bit
• Accuracy: ± 0.2 % of full scale
• Diagnostic Functions: Open-circuit, overrange
• Isolation: 500 V DC channel-to-backplane
• Input Filter Time: 0 … 100 ms configurable
• Power Consumption: ~ 2 W
• Module Width: 40 mm
• Mounting: Plug-in on S7-300 rack backplane
• Operating Temperature: 0 … +60 °C
• Protection Class: IP20 (cabinet installation)
• Weight: ≈ 200 g

Application Areas

• Precise acquisition of process signals (flow, pressure, level)
• Machine-tool analog feedback (temperature, position)
• Batch and recipe control in food, pharma, and chemical industries
• OEM equipment requiring high-density analog I/O

Advantages

• High channel density in a narrow 40 mm module
• Integrated diagnostics reduce troubleshooting time
• Configurable filtering improves noise immunity
• Seamless STEP 7/TIA Portal integration for easy commissioning
• Proven industrial reliability for 24/7 operation