{"product_id":"allen-bradley-1745-e157-slc-150-i-o-expansion-unit","title":"Allen-Bradley 1745-E157 SLC 150 I\/O Expansion Unit","description":"\u003cp\u003eConfigured for discrete signal expansion and contact execution in SLC 150 programmable logic controller platforms, the \u003cstrong\u003eAllen-Bradley 1745-E157\u003c\/strong\u003e (\u003cstrong\u003e1745-E157\u003c\/strong\u003e I\/O Expansion Unit) provides direct physical\/electrical execution across hardwired field terminal points.\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-E157\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\u003e2.80 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\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003eSLC 150 Programmable Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Category\u003c\/td\u003e\n\u003ctd\u003ePLC Expansion Unit \/ Rack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterconnect Interface\u003c\/td\u003e\n\u003ctd\u003eParallel Ribbon Expansion Bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Interconnect \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-E157 expansion unit links directly to the primary SLC 150 base unit via a multi-conductor ribbon interconnect cable, allowing the CPU scan loop to update field state points without protocol translation latencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware Flash Compatibility \u0026amp; Address Mapping\u003c\/strong\u003e: Dedicated registers map directly into the base controller image table, maintaining deterministic execution timing across expanded I\/O banks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanic Isolation \u0026amp; Noise Immunity\u003c\/strong\u003e: Optoisolated input stages and isolated output channels protect backplane logic drivers from transient spikes and ground loops in industrial environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1745-E157 expansion chassis be hot-swapped while the SLC 150 controller is operating?\u003c\/p\u003e\n\u003cp\u003eA: No. Hot-swapping is prohibited. Main power supply to the controller base and expansion modules must be de-energized prior to connecting or removing the expansion ribbon bus cable.\u003c\/p\u003e\n\u003cp\u003eQ: How is backplane power delivered to the internal logic components of the 1745-E157?\u003c\/p\u003e\n\u003cp\u003eA: Logic operating power and control bus communication signals pass through the dedicated expansion ribbon cable connected directly to the primary SLC 150 base unit.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhysical Mounting \u0026amp; Airflow Clearance\u003c\/strong\u003e: Securely mount the chassis to the enclosure backpanel using standard mounting hardware. Maintain a minimum vertical distance of 50 mm (2 inches) above and below the enclosure to ensure proper natural thermal convection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRibbon Interconnect Cabling\u003c\/strong\u003e: Fully insert and latch the expansion ribbon cable into the dedicated headers on both the primary processor and the 1745-E157 unit before energizing the system power circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding \u0026amp; Cable Separation\u003c\/strong\u003e: Connect a dedicated grounding wire from the chassis frame terminal directly to the cabinet single-point earth ground bar. Separate low-voltage DC lines from high-voltage AC lines by at least 200 mm to mitigate inductive noise coupling.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45340469887091,"sku":"1745-E157","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_09-14-37_13f40e48-7feb-4638-bd95-97541ab00cdf.png?v=1786411655","url":"https:\/\/www.dcssupplier.com\/ar\/products\/allen-bradley-1745-e157-slc-150-i-o-expansion-unit","provider":"DcsSupplier Limited","version":"1.0","type":"link"}