{"product_id":"allen-bradley-1746-ib8-digital-input-module","title":"Allen‑Bradley 1746‑IB8 Digital Input Module","description":"\u003ch2\u003eAllen‑Bradley 1746‑IB8 Digital Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for 24 VDC sinking‑type signal acquisition in SLC 500 backplane networks, the \u003cstrong\u003eAllen‑Bradley 1746‑IB8\u003c\/strong\u003e (\u003cstrong\u003e1746‑IB8\u003c\/strong\u003e digital input module) provides direct electrical execution of eight discrete input channels with fixed ON\/OFF delay characteristics.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e1746‑IB8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eAllen‑Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003e0.050 A @ 5 VDC (backplane), 0.0 A @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eDigital Input Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eSLC 500 (1746)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage Category\u003c\/th\u003e\n\u003ctd\u003e24 VDC sinking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Inputs\u003c\/th\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePoints per Common\u003c\/th\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Voltage\u003c\/th\u003e\n\u003ctd\u003e10–30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal Delay\u003c\/th\u003e\n\u003ctd\u003e8 ms ON, 8 ms OFF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOff‑State Voltage\u003c\/th\u003e\n\u003ctd\u003e5.0 VDC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOff‑State Current\u003c\/th\u003e\n\u003ctd\u003e1 mA max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInput Current\u003c\/th\u003e\n\u003ctd\u003e8 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity Licenses\u003c\/h3\u003e\n\u003cp\u003eThe 1746‑IB8 participates in deterministic backplane communication used across Allen‑Bradley SLC 500 architectures. Each input channel is sampled at fixed intervals defined by the processor’s scan cycle, ensuring predictable state recognition. I\/O density scaling allows multiple digital modules to coexist without altering propagation timing. Firmware flash compatibility resides entirely within the SLC processor; the IB8 contains no programmable logic and provides stable, passive input behavior across controller revisions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1746‑IB8 be hot‑swapped? A: No. The module must be inserted or removed only when the chassis is de‑energized to avoid backplane faults.\u003c\/p\u003e\n\u003cp\u003eQ: Does the module support sourcing inputs? A: No. The 1746‑IB8 is designed exclusively for sinking input configurations.\u003c\/p\u003e\n\u003cp\u003eQ: How do the fixed 8 ms delays affect input detection? A: The ON\/OFF delay defines the minimum transition time required for reliable state recognition during the processor scan.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoute 24 VDC input wiring separately from high‑energy conductors to reduce noise coupling.\u003c\/li\u003e\n\u003cli\u003eMaintain correct polarity for sinking devices to avoid false input states.\u003c\/li\u003e\n\u003cli\u003eEnsure terminal screws are tightened to manufacturer torque recommendations.\u003c\/li\u003e\n\u003cli\u003eVerify backplane power capacity when installing multiple digital modules.\u003c\/li\u003e\n\u003cli\u003eLabel field wiring to support maintenance and troubleshooting.\u003c\/li\u003e\n\u003cli\u003eMaintain non‑condensing humidity conditions to prevent terminal oxidation.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48225428308158,"sku":"1746‑IB8","price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/allen-bradley-1747-l532-slc-5-03-16k-controller-wslzrsjmgxe.png?v=1759047065","url":"https:\/\/www.autooiltech.com\/ar\/products\/allen-bradley-1746-ib8-digital-input-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}