Siemens 6ES7331-1KF01-0AB0 SIMATIC S7-300 SM331 8AI 13Bit 40PIN Analog Input Module

Siemens 6ES7331-1KF01-0AB0 SIMATIC S7-300 SM331 8AI 13Bit 40PIN Analog Input Module

Product Overview
The Siemens 6ES7331-1KF01-0AB0 is a high-precision analog input module (SM 331) for the SIMATIC S7-300 PLC family.  With eight universal, isolated inputs configurable for ±10 V or ±20 mA, it delivers 13-bit + sign resolution for accurate process monitoring in water treatment, packaging, and chemical skids.  The module slots directly into any S7-300 rack, connects via front-connector, and is fully supported by STEP 7 Classic or TIA Portal.

Key Features & Benefits
• 8 isolated AI channels – mix voltage, current, or resistance sensors
• 13-bit + sign resolution – 0.1 % accuracy for precise loop control
• ±10 V, ±20 mA ranges – universal input selection in software
• 2-wire or 4-wire transmitter supply – 24 V DC, 50 mA per channel
• 66 ms conversion time – fast enough for pressure, flow, or level loops
• Front connector coding – prevents wiring errors during maintenance
• Integral diagnostics – wire break, short-circuit, overflow alarms
• Hot-swap capable – exchange module without rack power-down
• UL, CE, ATEX Zone 2, marine approvals – worldwide installation

Typical Applications
• Tank level transmitters (4–20 mA)
• Flow meters & pressure sensors
• Batch reactor temperature loops
• Packaging line analog feedback

Technical Specifications
Order No.: 6ES7331-1KF01-0AB0
Module Type: SM 331 Analog Input
Channels: 8 universal, isolated
Resolution: 13-bit + sign
Ranges: ±10 V, ±20 mA, 0–10 V, 0–20 mA, 4–20 mA
Measurement Error: ±0.1 % FS @ 25 °C
Conversion Time: 66 ms all channels
Common-mode Rejection: >70 dB
Supply Voltage: 24 V DC (20.4–28.8 V) from backplane
Power Dissipation: 1.2 W typ.
Front Connector: 40-pin, screw or spring (order separately)
Operating Temperature: 0 °C…+60 °C

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