{"product_id":"6es7431-1kf20-0ab0-siemens-s7-400-analog-input-module","title":"6ES7431-1KF20-0AB0 Siemens S7-400 Analog Input Module","description":"\u003ch2\u003e\u003cstrong\u003e6ES7431-1KF20-0AB0 — Siemens SIMATIC S7-400 Analog Input Module SM 431\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Technical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Siemens — a global leader in industrial automation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e6ES7431-1KF20-0AB0\u003c\/strong\u003e — part of the SIMATIC S7-400 family.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Analog input module SM 431, isolated, 8 AI channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 14-bit with overrange (including sign).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCycle time:\u003c\/strong\u003e 0.416 ms for all 8 channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 24 V DC load voltage (only for 2-wire transmitters).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReverse polarity protection:\u003c\/strong\u003e Yes — protects the module from wiring errors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput current:\u003c\/strong\u003e Max. 200 mA from load voltage L+ (no load).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower loss:\u003c\/strong\u003e Typically 4.9 W.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAnalog Input Ranges and Measurement\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage ranges:\u003c\/strong\u003e 1 V to 5 V, -1 V to +1 V, and -10 V to +10 V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput resistance:\u003c\/strong\u003e 10 MΩ for 1–5 V and ±1 V; 100 kΩ for ±10 V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent ranges:\u003c\/strong\u003e ±20 mA and 4–20 mA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput resistance:\u003c\/strong\u003e 50 Ω for ±20 mA; 50 kΩ for 4–20 mA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance range:\u003c\/strong\u003e 0 to 600 ohms — ideal for resistance-type transmitters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstant measurement current:\u003c\/strong\u003e Typically 1.67 mA for resistance measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePermissible input voltage:\u003c\/strong\u003e Max. 18 V continuous (75 V for 1 ms, ratio 1:20).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePermissible input current:\u003c\/strong\u003e Max. 40 mA permanent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAccuracy, Speed, and Noise Immunity\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature error:\u003c\/strong\u003e ±0.03 %\/K relative to input range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperational error limit:\u003c\/strong\u003e ±0.7 % for ±1 V; ±0.9 % for ±10 V and 1–5 V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent error:\u003c\/strong\u003e ±0.8 % for ±20 mA and 4–20 mA ranges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance error:\u003c\/strong\u003e ±1 % relative to input range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBasic error at 25 °C:\u003c\/strong\u003e ±0.6 % for ±1 V; ±0.75 % for ±10 V and 1–5 V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterference suppression:\u003c\/strong\u003e Selectable for none, 400 Hz, 60 Hz, or 50 Hz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput filter time constant:\u003c\/strong\u003e 15 µs — helps reject high-frequency noise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBasic execution time:\u003c\/strong\u003e 0.42 s for all channels released.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eIsolation, Diagnostics, and Environmental Durability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotential separation:\u003c\/strong\u003e Yes — between analog inputs and backplane bus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel isolation:\u003c\/strong\u003e No isolation between individual channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad voltage isolation:\u003c\/strong\u003e Yes — between channels and load voltage L+.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation test:\u003c\/strong\u003e 2120 V DC between bus and analog section.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagnostics function:\u003c\/strong\u003e No — this module does not provide channel diagnostics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielded cable length:\u003c\/strong\u003e Max. 200 m for reliable signal transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 25 mm wide, 290 mm high, 210 mm deep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approximately 500 g.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Guide\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the module in a Siemens S7-400 rack with proper backplane bus connection.\u003c\/li\u003e\n\u003cli\u003eConnect 24 V DC load voltage only when using 2-wire transmitters.\u003c\/li\u003e\n\u003cli\u003eUse shielded twisted-pair cables to reduce electrical noise and interference.\u003c\/li\u003e\n\u003cli\u003eKeep cable length under 200 m for resistance and voltage measurements.\u003c\/li\u003e\n\u003cli\u003eVerify reverse polarity protection works by checking wiring before power-up.\u003c\/li\u003e\n\u003cli\u003eConfigure input ranges and interference suppression in STEP 7 software.\u003c\/li\u003e\n\u003cli\u003eAllow the module to warm up to 25 °C for best accuracy performance.\u003c\/li\u003e\n\u003cli\u003eDo not exceed 18 V continuous input voltage to avoid permanent damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Siemens \u003cstrong\u003e6ES7431-1KF20-0AB0\u003c\/strong\u003e analog input module SM 431.\u003c\/li\u003e\n\u003cli\u003e1 × Quick reference guide for wiring and configuration.\u003c\/li\u003e\n\u003cli\u003e1 × Protective shipping carton with anti-static foam.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eShipping and Support\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWe ship via FedEx, UPS, and DHL — choose your preferred courier at checkout.\u003c\/li\u003e\n\u003cli\u003eOur stock is ready for immediate dispatch within 5 days after payment.\u003c\/li\u003e\n\u003cli\u003eWe accept returns within 30 days for unused items in original packaging.\u003c\/li\u003e\n\u003cli\u003eContact us for bulk orders or technical questions about this Siemens module.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the resolution of the 6ES7431-1KF20-0AB0?\u003c\/strong\u003e\u003cbr\u003eA: It provides 14-bit resolution with overrange, including the sign bit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can this module measure resistance thermometers?\u003c\/strong\u003e\u003cbr\u003eA: No, it does not support thermocouples or resistance thermometers. It supports resistance measurement from 0 to 600 ohms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: How many analog inputs does this module have?\u003c\/strong\u003e\u003cbr\u003eA: It has 8 analog input channels, but only 4 channels work for resistance measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the cycle time for all 8 channels?\u003c\/strong\u003e\u003cbr\u003eA: The cycle time is 0.416 ms, which is fast for industrial control loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Does this module support 2-wire and 4-wire transmitters?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it supports 2-wire, 3-wire, and 4-wire connections for current and resistance measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the maximum shielded cable length?\u003c\/strong\u003e\u003cbr\u003eA: You can use shielded cables up to 200 meters long without signal degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Is the module isolated between channels?\u003c\/strong\u003e\u003cbr\u003eA: No, there is no isolation between individual channels, but it is isolated from the backplane bus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the power loss of this module?\u003c\/strong\u003e\u003cbr\u003eA: The typical power loss is 4.9 W, which is moderate for a 8-channel analog input module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can I use this module with a 24 V DC supply?\u003c\/strong\u003e\u003cbr\u003eA: Yes, 24 V DC load voltage is only required when powering 2-wire transmitters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: How do I suppress interference at 50 Hz or 60 Hz?\u003c\/strong\u003e\u003cbr\u003eA: You can parameterize the interference suppression frequency in STEP 7 software.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eContact Information\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInquiries: \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003ePhone\/WhatsApp: \u003ca href=\"https:\/\/wa.me\/8615392429628\"\u003e+86 153 9242 9628\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003ePartner: \u003ca href=\"https:\/\/www.nex-auto.com\/\"\u003eNexAuto Technology Limited\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":47360958759073,"sku":"6ES7431-1KF20-0AB0","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/6ES7431-1KF20-0AB0.jpg?v=1789366209","url":"https:\/\/www.autonexcontrol.com\/products\/6es7431-1kf20-0ab0-siemens-s7-400-analog-input-module","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}