{"product_id":"1791-24b8-24v-dc-i-o-module-10-30v-allen-bradley","title":"1791-24B8 24V DC I\/O Module 10-30V Allen-Bradley","description":"\u003ch2\u003e\u003cstrong\u003e1791-24B8 Allen‑Bradley 24‑Input 8‑Output DC Block I\/O Module\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003eKey Technical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: #b22222;\"\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Allen‑Bradley.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #b22222;\"\u003e\u003cstrong\u003eModel:\u003c\/strong\u003e 1791-24B8\u003c\/span\u003e – 24‑point DC input \/ 8‑point DC output Block I\/O.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput voltage range:\u003c\/strong\u003e 10‑30V DC (on‑state), with 11 mA max at 30V. Off‑state voltage below 5V DC ensures noise immunity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput characteristics:\u003c\/strong\u003e 3.4 kΩ impedance, programmable delay: fast (1 ms ON \/ 5 ms OFF) or slow (1 ms ON \/ 18 ms OFF).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput current rating:\u003c\/strong\u003e 0.5 A to 1 A per channel (derated above 30 °C, depends on mounting orientation).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurge capability:\u003c\/strong\u003e 3 A for 50 ms, repeats every 2 s – handles inrush loads like solenoids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal power requirement:\u003c\/strong\u003e 19.2‑30V DC, 300 mA – module includes internal protection against reverse polarity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental range:\u003c\/strong\u003e 0 °C to 60 °C (32 °F to 140 °F), 5 % to 95 % relative humidity non‑condensing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions \u0026amp; weight:\u003c\/strong\u003e 176.5 x 68.8 x 98 mm (6.95 x 2.7 x 3.85 in), 1.75 lb (0.79 kg).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan the \u003cstrong\u003e1791-24B8\u003c\/strong\u003e outputs drive inductive loads like relays?\u003c\/strong\u003e Yes, but add a freewheeling diode across the DC coil to protect the output transistor from voltage spikes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the minimum input current to guarantee ON state?\u003c\/strong\u003e At 11V DC the input draws at least 2.5 mA, which reliably turns on the channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes horizontal mounting reduce output current?\u003c\/strong\u003e Yes – above 30 °C horizontally mounted units derate from 500 mA to 250 mA; vertical mounting allows up to 1 A below 30 °C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow do I select fast or slow input filtering?\u003c\/strong\u003e The \u003cstrong\u003e1791-24B8\u003c\/strong\u003e has no on‑board switch; the selection is made via the programming software of the controlling PLC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the power dissipation of this module?\u003c\/strong\u003e Maximum 17.1 W (58.1 BTU\/h) – ensure adequate ventilation inside the panel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-top: 20px;\"\u003eFor inquiries or to place an order, contact us at \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e or \u003ca href=\"https:\/\/wa.me\/8615392429628\" target=\"_blank\"\u003e+86 153 9242 9628 (WhatsApp)\u003c\/a\u003e.\u003cbr\u003ePartner: \u003ca href=\"https:\/\/www.nex-auto.com\/\" target=\"_blank\"\u003eNexAuto Technology Limited\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45836497584289,"sku":"1791-24B8","price":240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/1791-24B8.jpg?v=1780645812","url":"https:\/\/www.autonexcontrol.com\/products\/1791-24b8-24v-dc-i-o-module-10-30v-allen-bradley","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}