{"product_id":"6es7421-1fh20-0aa0-simatic-s7-400-digital-input-sm-421","title":"6ES7421-1FH20-0AA0 SIMATIC S7-400 Digital Input SM 421","description":"\u003ch2\u003e\u003cstrong\u003e6ES7421-1FH20-0AA0 SIMATIC S7-400 Digital Input SM 421\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 \u0026amp; Model:\u003c\/strong\u003e Siemens SIMATIC S7-400, \u003cstrong\u003e6ES7421-1FH20-0AA0\u003c\/strong\u003e (SM 421).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e 16 digital inputs, isolated per channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e Rated UC 230 V (120\/230 V AC\/DC, 47-63 Hz).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal \"0\" Range:\u003c\/strong\u003e 0 to 40 V AC \/ -40 to +40 V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal \"1\" Range:\u003c\/strong\u003e 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Current (Signal \"1\"):\u003c\/strong\u003e Typ. 10 mA at 120 V AC, 14 mA at 230 V AC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuiescent Current (Signal \"0\"):\u003c\/strong\u003e Max. 6 mA AC, 2 mA DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Delay:\u003c\/strong\u003e 20 ms (0→1 AC), 15 ms (0→1 DC); 30 ms (1→0 AC), 25 ms (1→0 DC).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Loss:\u003c\/strong\u003e Typ. 12 W.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Bus Current:\u003c\/strong\u003e Max. 80 mA at 5 V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e Shielded up to 1000 m, unshielded up to 600 m.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-Wire Sensor Support:\u003c\/strong\u003e Yes, max quiescent current 5 mA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagnostics:\u003c\/strong\u003e No diagnostic function, but status LEDs per channel (green).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Between channels (groups of 4) and backplane bus. Tested at 1500 V AC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation \u0026amp; Wiring Guidelines\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the \u003cstrong\u003e6ES7421-1FH20-0AA0\u003c\/strong\u003e module on a standard S7-400 rack.\u003c\/li\u003e\n\u003cli\u003eConnect the backplane bus via the 5 V DC supply (max 80 mA).\u003c\/li\u003e\n\u003cli\u003eWire inputs using shielded cables for runs up to 1000 m.\u003c\/li\u003e\n\u003cli\u003eUse unshielded cables only for distances up to 600 m.\u003c\/li\u003e\n\u003cli\u003eObserve the polarity for DC signals and phase for AC signals.\u003c\/li\u003e\n\u003cli\u003eGroup isolation: each group of 4 channels is isolated from others.\u003c\/li\u003e\n\u003cli\u003eEnsure the input voltage stays within the specified \"0\" and \"1\" ranges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOne SIMATIC S7-400 \u003cstrong\u003e6ES7421-1FH20-0AA0\u003c\/strong\u003e digital input module.\u003c\/li\u003e\n\u003cli\u003eFront connector (screw-type, included).\u003c\/li\u003e\n\u003cli\u003eLabeling strips and coding elements.\u003c\/li\u003e\n\u003cli\u003eUser manual (digital download).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eShipping \u0026amp; Logistics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShipping carriers: FedEx, UPS, DHL.\u003c\/li\u003e\n\u003cli\u003eWe ship within 5 business days after order confirmation.\u003c\/li\u003e\n\u003cli\u003eAll items are brand new and original Siemens products.\u003c\/li\u003e\n\u003cli\u003eWe maintain stock for fast dispatch.\u003c\/li\u003e\n\u003cli\u003e30-day return policy applies (terms and conditions).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Is this module compatible with 230 V AC inputs?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the \u003cstrong\u003e6ES7421-1FH20-0AA0\u003c\/strong\u003e accepts 120\/230 V UC (AC\/DC).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can I use 2-wire proximity sensors?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it supports 2-wire sensors with max 5 mA quiescent current (AC).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the input delay for DC signals?\u003c\/strong\u003e\u003cbr\u003eA: For DC, 0→1 delay is 15 ms, and 1→0 delay is 25 ms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Are all channels isolated from each other?\u003c\/strong\u003e\u003cbr\u003eA: Isolation is in groups of 4 channels; groups are isolated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Do you have these in stock?\u003c\/strong\u003e\u003cbr\u003eA: Yes, we have \u003cstrong\u003e6ES7421-1FH20-0AA0\u003c\/strong\u003e modules in stock ready to ship.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What shipping methods do you offer?\u003c\/strong\u003e\u003cbr\u003eA: We ship via FedEx, UPS, and DHL worldwide.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eContact Information:\u003c\/strong\u003e For inquiries, please email \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e or call \u003ca href=\"https:\/\/wa.me\/8615392429628\"\u003e+86 153 9242 9628\u003c\/a\u003e (WhatsApp).\u003c\/p\u003e\n\u003cp\u003ePartner: \u003ca href=\"https:\/\/www.nex-auto.com\/\" target=\"_blank\"\u003eNexAuto Technology Limited\u003c\/a\u003e\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46947183689889,"sku":"6ES7421-1FH20-0AA0","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/6ES7421-1FH20-0AA0.jpg?v=1788160985","url":"https:\/\/www.autonexcontrol.com\/products\/6es7421-1fh20-0aa0-simatic-s7-400-digital-input-sm-421","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}