{"product_id":"siemens-6es7221-3bf50-0xb0-sb-1221-8di-100khz","title":"Siemens 6ES7221-3BF50-0XB0 SIMATIC S7-1200 SB 1221 8DI 24VDC 100kHz Digital Input Signal Board","description":"\u003cp\u003eThe Siemens 6ES7221-3BF50-0XB0 SIMATIC S7-1200 SB 1221 signal board adds 8 sink\/source digital inputs at 24 V DC to a compact CPU, with a 100 kHz high-speed counting input option. It draws 108 mA from the backplane bus, dissipates 2.4 W, and mounts directly onto the CPU front without extra rack space.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6ES7221-3BF50-0XB0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSIMATIC S7-1200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type Designation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSB 1221, DI 8x 24 V DC 100 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDigital Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8, sink\/source, in 1 group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Characteristic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIEC 61131 type 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 V DC rated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal 0 Threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 V DC or 0.5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal 1 Threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 V DC at 2.5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBackplane Current, typ.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e108 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Loss, typ.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.4 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Filter, parameterizable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.1-20 us or 0.05-20 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCable Length, shielded, max.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500 m (50 m for HSC inputs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCable Length, unshielded, max.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIsolation, channels to backplane\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e707 V DC (type test)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIP Degree of Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmbient Temperature, vertical install\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20 to 50 C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e26 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eCertifications \u0026amp; Standards\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCE\u003c\/li\u003e\n\u003cli\u003eUL\u003c\/li\u003e\n\u003cli\u003ecULus\u003c\/li\u003e\n\u003cli\u003eRCM\u003c\/li\u003e\n\u003cli\u003eKC\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSelection Notes\u003c\/h2\u003e\u003cp\u003eThis SB 1221 variant delivers 8 sink\/source inputs at up to 100 kHz; a shorter-channel-count sibling in the same signal board family instead runs 4 inputs at 200 kHz. Pick this 8-channel version when the application needs more input points than count channels, and the 4-channel version when raw edge-detection speed on fewer points matters more. Signal boards mount directly onto the S7-1200 CPU front, adding I\/O without consuming a rack slot, unlike SM-series expansion modules. The 707 V DC isolation test between channels and backplane bus is a standard type test rating, not a safety-isolation barrier.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eAdds digital sensing capacity to a single S7-1200 CPU without a rack slot: proximity sensor banks, limit switches, and pulse counting from encoders or flow meters up to 100 kHz per channel.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":53960778023195,"sku":"6ES7221-3BF50-0XB0","price":108.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0903\/7722\/4475\/files\/siemens-6es7221-3bf50-0xb0-sb1221-8di-100khz-signal-board.png?v=1789663850","url":"https:\/\/stoklink.com\/products\/siemens-6es7221-3bf50-0xb0-sb-1221-8di-100khz","provider":"Stoklink","version":"1.0","type":"link"}