{"product_id":"siemens-6es7331-7kf02-0ab0","title":"Siemens 6ES7331-7KF02-0AB0 S7-300 SM 331 Analog Input 8AI","description":"\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eVersatile analog input module for Siemens S7-300 PLC systems, supporting voltage, current, thermocouple, and resistance\/RTD measurement in a single unit. 8 differential channels with galvanic isolation and configurable resolution (9\/12\/14 bits). Integrated diagnostics, alarm functions, and support for active backplane bus hot-swapping. A flexible solution for industrial automation requiring mixed signal type acquisition.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eApplications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eTemperature monitoring with thermocouples (Types E, J, K, L, N)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eRTD measurement (Pt100, Ni100)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eProcess variable acquisition (pressure, flow, level via 4-20mA transmitters)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eVoltage signal acquisition (±10V, 0-10V, ±1V to ±10V ranges)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eFactory automation and machine building\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eProcess control systems requiring mixed analog inputs\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eNumber of inputs: 8 analog inputs (differential, 4 channel groups)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSupported signal types: Voltage (±10V, ±1V to ±10V, 1-5V), Current (0-20mA, 4-20mA, ±20mA), Thermocouple (E, J, K, L, N), Resistance\/RTD (Pt100, Ni100)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eResolution: Configurable 9\/12\/14 bits per channel group\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eInput resistance: Voltage 100kΩ, Current 25Ω, Resistance 10MΩ\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eIsolation: Galvanic isolation between channels and backplane bus\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eDiagnostics: Module-level diagnostic alarm, configurable limit value monitoring, wire break detection (for current signals, ≤3.6mA triggers fault)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSupply voltage: 24V DC (L+), reverse polarity protection\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003ePower loss: Typical 1W\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eDimensions (approx.): 125 mm x 40 mm x 120 mm (H x W x D)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eWeight: Approx. 250 g (module only)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eCompatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSIMATIC S7-300 CPUs (all variants supporting SM modules)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eET200M distributed I\/O stations (supports hot-swapping with active backplane bus)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSTEP 7 (classic) and TIA Portal via HW Config\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eRequires 20-pin front connector (not included)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eRelated Products:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003e6ES7331-1KF02-0AB0 – SM 331 AI 8x13 bits (simplified measurement functions)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003e6ES7331-7KF02-0AB0 – SM 331 AI 8x12 bits isolated (current model)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003e6ES7331-7HF01-0AB0 – SM 331 AI 8x13 bits isolated (faster conversion, higher accuracy)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003e6ES7332-5HD01-0AB0 – SM 332 AO 4x12 bits (isolated analog output)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eFor higher channel count or different accuracy requirements, consider other S7-300 SM 331 variants.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eProduct Status:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLegacy product, active spare part for existing S7-300 installations. Requires external 20-pin front connector for wiring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003ePLC ERA is an independent industrial automation distributor. Products are sourced through established supply channels and inspected prior to shipment. International shipping available.\u003c\/span\u003e\u003c\/p\u003e","brand":"SIEMENS","offers":[{"title":"Default Title","offer_id":52906875388223,"sku":"6ES7331-7KF02-0AB0","price":834.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/9477\/1519\/files\/siemens-6es7331-7kf02-0ab0-s7-300-sm-331-analog-input-8ai-6461353.jpg?v=1778120948","url":"https:\/\/plcera.com\/products\/siemens-6es7331-7kf02-0ab0","provider":"PLC ERA","version":"1.0","type":"link"}