Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 SM331 8 Channel 12Bits Analog Input Module

Siemens 6ES7331-7KF02-0AB0 SIMATIC S7-300 SM331 8AI 12Bits Analog Input Module

Product Overview
The Siemens 6ES7331-7KF02-0AB0 is the flagship 8-channel universal analog input module for the SIMATIC S7-300 family.  Each channel can be software-configured for voltage (±10 V), current (±20 mA/4–20 mA), resistance thermometer (RTD), or thermocouple (TC) signals, eliminating the need for multiple hardware variants.  With 9/12/14-bit resolution (plus sign) and integrated diagnostics, the module delivers ±0.1 % accuracy for critical process loops in water treatment, packaging, and chemical skids.

Key Features & Benefits
• 8 isolated universal inputs – mix any combination of voltage, current, RTD, or TC on one card
• 9/12/14-bit resolution plus sign – 0.1 % accuracy for precise control
• 2-wire & 4-wire transmitter supply – 24 V DC, 50 mA per channel
• 66 ms total cycle time – fast enough for flow, pressure, and temperature loops
• Wire-break, short-circuit & overflow diagnostics – reduce downtime
• Hot-swap capable – exchange during operation without rack power-down
• Front connector coding – prevents wiring errors during maintenance
• UL, CE, ATEX Zone 2, marine approvals – worldwide acceptance

Typical Applications
• Tank level transmitters (4–20 mA)
• Reactor temperature loops (RTD/TC)
• Flow and pressure monitoring
• Batch recipe ingredient weighing

Technical Specifications
Order No.: 6ES7331-7KF02-0AB0
Channels: 8 universal, isolated
Resolution: 9/12/14-bit + sign
Ranges: ±10 V, 0–10 V, ±20 mA, 0–20 mA, 4–20 mA, RTD (Pt100/200/500/1000), TC (B, E, J, K, N, R, S, T)
Accuracy: ±0.1 % FS @ 25 °C
Conversion Time: 66 ms all channels
Diagnostics: Wire-break, short-circuit, overflow, underflow
Power Supply: 24 V DC (20.4–28.8 V) via backplane
Power Dissipation: 1.2 W typical
Front Connector: 20-pin (screw or spring, order separately)
Operating Temperature: 0 °C … +60 °C

Product Pictures

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