{"product_id":"1746-ob8-allen-bradley-slc-500-core-function-keyword-new-original-stock","title":"1746-OB8 Allen-Bradley SLC 500 Core Function Keyword | New \u0026 Original Stock","description":"\u003ch2\u003eAllen-Bradley 1746-OB8 SLC 500 Digital I\/O Modules\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1746-OB8\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1746-OB8\u003c\/strong\u003e Digital DC Output Module, operates as a dedicated hardware component for discrete current-sourcing execution within SLC 500 platforms.\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\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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-OB8\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\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.50 lbs (0.23 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard SLC 500 single-slot module footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane current draw: 135 mA @ 5 VDC, 0 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e8 current-sourcing outputs (1 group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoints per Common\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10 to 50 VDC (source)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Current per Point\u003c\/td\u003e\n\u003ctd\u003e1.0 A @ 30 deg C \/ 0.50 A @ 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Current per Module\u003c\/td\u003e\n\u003ctd\u003e8.0 A @ 30 deg C \/ 4.0 A @ 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax On-State Voltage Drop\u003c\/td\u003e\n\u003ctd\u003e1.2 V @ 1.0 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge Current per Point\u003c\/td\u003e\n\u003ctd\u003e3.0 A for 10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Off-State Leakage\u003c\/td\u003e\n\u003ctd\u003e1 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin Load Current\u003c\/td\u003e\n\u003ctd\u003e1 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStep Response\u003c\/td\u003e\n\u003ctd\u003e60 ms on-delay \/ 2.5 ms off-delay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Control \u0026amp; Drive Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1746-OB8 synchronizes signal sequencing according to the backplane bus communication velocity limitations of the legacy SLC chassis. Deployed alongside network scanning interfaces, it coordinates localized I\/O density scaling profiles within Profinet \/ EtherNet\/IP deterministic networks. Maintaining consistent firmware flash compatibility between peripheral communication adapters and the central processor is necessary to guarantee accurate mapping of the 8-point sourcing register without causing packet update failures or circuit propagation lag.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1746-OB8 module allow Online Insertion and Removal (OIR) under backplane electrical load?\u003c\/p\u003e\n\u003cp\u003eA: No. The SLC 500 rack structure does not support hot-swapping or Removal and Insertion Under Power (RIUP). Prior to removing or inserting this card into the chassis slot, the primary power supply powering the backplane must be completely isolated to avoid corrupting data registers or causing electrical degradation.\u003c\/p\u003e\n\u003cp\u003eQ: How do environmental conditions affect the output current capacity of the 1746-OB8?\u003c\/p\u003e\n\u003cp\u003eA: The continuous current limit per output is strictly constrained by linear thermal derating curves. At an internal ambient temperature of 30 deg C, each channel supports 1.0 A continuous load; this rating drops directly to 0.50 A per channel when operating at the maximum upper limit of 60 deg C.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Slot Insertion\u003c\/strong\u003e: Power down the assembly. Align the printed circuit board side rails with the top and bottom chassis slot grooves, pushing the module until the mechanical locking retention tabs latch firmly into the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSourcing Field Connections\u003c\/strong\u003e: Connect the external 10-50 VDC supply positive lead to the common rail of the removable terminal block. Ensure that all field actuators are landed to their corresponding terminal outputs, observing proper wire gauge to handle high continuous current loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding Protocols\u003c\/strong\u003e: Verify that the SLC 500 chassis frame is connected directly to a low-impedance functional earth ground grid. Separate discrete DC signal loops from concurrent AC inductive power conduits to suppress high-frequency electromagnetic noise injection.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43421027958874,"sku":"1746-OB8","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/8.1_ea635e9c-7d3d-4eae-914d-c01b94b10ba3.jpg?v=1779846579","url":"https:\/\/www.spareoil.com\/products\/1746-ob8-allen-bradley-slc-500-core-function-keyword-new-original-stock","provider":"SpareOil Automation","version":"1.0","type":"link"}