{"product_id":"allen-bradley-1745-e154-combination-i-o-expansion-unit","title":"Allen Bradley 1745-E154 Combination I\/O Expansion Unit","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1745-E154\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1745-E154\u003c\/strong\u003e Combination I\/O Expansion Unit, operates as a dedicated hardware component for discrete channel expansion within SLC 150 controller architectures.\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\u003e1745-E154\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\u003e3.46 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e10.0 x 6.5 x 4.0 inches\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\u003e15 VA maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Capacity\u003c\/td\u003e\n\u003ctd\u003e20 External Input Circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Capacity\u003c\/td\u003e\n\u003ctd\u003e12 External Output Circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003eSLC 150 Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eCombination I\/O Expansion Chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterconnect Interface\u003c\/td\u003e\n\u003ctd\u003eParallel Ribbon Expansion Bus Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication \u0026amp; I\/O Density Scaling\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeterminism \u0026amp; Bus Execution\u003c\/strong\u003e: The 1745-E154 interface communicates directly with the master SLC 150 processor unit via a multi-conductor parallel ribbon cable, extending internal logic scan execution across 20 input and 12 output channels without network protocol latencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware Flash Compatibility \u0026amp; Memory Mapping\u003c\/strong\u003e: Fixed register addressing assigns expansion channels directly into the controller image table, maintaining rigid deterministic cycle execution across expanded I\/O banks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanic Isolation \u0026amp; Signal Integrity\u003c\/strong\u003e: Channel optocouplers and electrical isolation circuits prevent transient voltage surges from entering backplane logic channels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Is the 1745-E154 expansion unit hot-swappable during controller operation?\u003c\/p\u003e\n\u003cp\u003eA: No. Hot-swapping is prohibited. Master AC\/DC power to the primary SLC 150 processor and all connected expansion units must be de-energized prior to attaching or disconnecting the interconnect ribbon cable.\u003c\/p\u003e\n\u003cp\u003eQ: How is backplane bus synchronization maintained between the primary processor and the 1745-E154?\u003c\/p\u003e\n\u003cp\u003eA: Clock and data framing signals pass directly over the multi-pin ribbon bus cable, synchronizing input reading and output latching with the master CPU scan cycle.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical Mounting \u0026amp; Thermal Spacing\u003c\/strong\u003e: Mount the chassis vertically on a flat panel surface using standard mounting fasteners. Maintain a minimum vertical spacing of 50 mm (2 inches) above and below the enclosure to ensure unimpeded natural thermal convection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRibbon Interconnect Cabling\u003c\/strong\u003e: Fully insert and lock the ribbon cable interconnect into the designated board headers on both the base controller and expansion unit before applying supply voltage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding \u0026amp; Cable Routing\u003c\/strong\u003e: Connect a low-impedance copper ground braid from the chassis terminal directly to the enclosure earth ground bus bar. Separate field I\/O signal wiring from high-voltage motor conductors by at least 200 mm to suppress inductive cross-talk.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45340469493875,"sku":"1745-E154","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-08-11_09-15-16.png?v=1786411917","url":"https:\/\/www.dcssupplier.com\/ar\/products\/allen-bradley-1745-e154-combination-i-o-expansion-unit","provider":"DcsSupplier Limited","version":"1.0","type":"link"}