{"product_id":"allen-bradley-1746-ob16-slc-500-digital-dc-output-module","title":"Allen-Bradley 1746-OB16 SLC 500 Digital DC Output Module","description":"\u003ch1\u003eAllen-Bradley 1746-OB16 SLC 500 Digital DC Output Module\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746-OB16\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1746-OB16 SLC 500 digital output module\u003c\/strong\u003e, serves as the primary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSLC 500 DC sourcing output module\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eutilized to execute 16-point discrete load switching across SLC 500 backplane-controlled rack systems. Configured for 24 VDC signal-level switching in SLC 500 architectures, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746-OB16\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides direct electrical drive of field loads through transistor-based output stages managed via 5 VDC backplane logic.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo formal suffix structure is defined in the provided documentation. The part number 1746-OB16 is treated as a fixed configuration within the SLC 500 output module family.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1746-OB16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane: 0.28 A @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eDC sourcing outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e16 (single group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Category\u003c\/td\u003e\n\u003ctd\u003e24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10 to 50 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Dissipation\u003c\/td\u003e\n\u003ctd\u003e7.6 W total module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSLC 500 Backplane Communication and I\/O Switching Behavior\u003c\/h3\u003e\n\u003cp\u003eThe 1746-OB16 interfaces with the SLC 500 backplane through 5 VDC logic-level signaling, where 0.28 A backplane current supports internal opto-isolation and transistor gate drive circuits. Output execution is determined by scan cycle update timing, with discrete ON\/OFF transitions controlled by internal switching latency characteristics.\u003c\/p\u003e\n\u003cp\u003eEach of the 16 channels is organized in a single output group, enabling consolidated return reference architecture. DC sourcing topology allows external field loads to be energized directly from the module output transistor stages, with switching governed by PLC logic state updates rather than mechanical relay action.\u003c\/p\u003e\n\u003cp\u003eThermal behavior is defined by per-point and total module dissipation limits, requiring thermal derating under elevated ambient conditions to maintain semiconductor junction stability.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1746-OB16 be hot-swapped while the SLC 500 rack is powered?\u003cbr\u003eA: Hot-swapping is not specified. Standard practice requires system power removal before module insertion or removal to avoid backplane disturbance.\u003c\/p\u003e\n\u003cp\u003eQ: Does backplane current change with output load activity?\u003cbr\u003eA: No. The module consumes a fixed 0.28 A @ 5 VDC from the backplane independent of output switching state.\u003c\/p\u003e\n\u003cp\u003eQ: What limits the maximum output switching speed?\u003cbr\u003eA: Switching is constrained by internal transistor response and PLC scan cycle timing, with typical delays in the sub-millisecond range depending on load conditions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module into an SLC 500 rack slot with correct backplane alignment to ensure full connector seating. Use the removable terminal block for field wiring termination, ensuring consistent torque application to prevent intermittent contact under DC switching load.\u003c\/p\u003e\n\u003cp\u003eMaintain separation between DC output wiring and high-voltage conductors to reduce capacitive coupling across output channels. Grouped wiring should respect common reference design to prevent unintended return path interactions.\u003c\/p\u003e\n\u003cp\u003eVerify load polarity and voltage range compatibility (10 to 50 V DC) before energization. Inductive loads require external suppression elements to limit voltage spikes during transistor turn-off events.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43505269637210,"sku":"1746-OB16","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746-OB162.jpg?v=1781685730","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746-ob16-slc-500-digital-dc-output-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}