{"product_id":"allen-bradley-1746-io4-combination-i-o-module","title":"Allen-Bradley 1746-IO4 SLC 500 Combination I\/O Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Allen-Bradley 1746-IO4 is a compact, entry-level combination I\/O module designed for the SLC 500 series programmable controller family. This module provides a space-saving solution for small-scale automation tasks, featuring two 120V AC inputs and two relay contact outputs (Form A, Normally Open). It is an ideal choice for simple control loops or for expanding a chassis with minimal I\/O requirements without occupying excessive slot space.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Design:\u003c\/strong\u003e Smallest combination I\/O unit in the SLC 500 series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Relay Outputs:\u003c\/strong\u003e Dry contacts support a wide range of switching voltages, including 5 to 265V AC or 5 to 125V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Minimal backplane current draw (30 mA at 5V DC) preserves the system power budget.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Input:\u003c\/strong\u003e Two integrated 120V AC inputs for standard industrial sensing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThe 1746-IO4 is commonly utilized in small machine control, auxiliary I\/O expansion for SLC 500 chassis, and simple interlock or monitoring applications where only a few points of I\/O are required.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\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\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eSLC 500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital I\/O Combination Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003e2 x 120V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e2 x Relay (Form A, Normally Open)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e85–132V AC (47–63 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e5–265V AC \/ 5–125V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Continuous Current (Relay)\u003c\/td\u003e\n\u003ctd\u003e1.5A at 120V AC \/ 1.2A at 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5V DC)\u003c\/td\u003e\n\u003ctd\u003e30 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (24V DC)\u003c\/td\u003e\n\u003ctd\u003e25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Delay\u003c\/td\u003e\n\u003ctd\u003e35 ms (ON) \/ 45 ms (OFF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-25 to 60 degC (-13 to 140 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Down:\u003c\/strong\u003e Always remove power from the SLC 500 chassis before inserting or removing any I\/O module to prevent electrical damage or unexpected system behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eESD Protection:\u003c\/strong\u003e Handle the module by its edges and avoid touching the backplane connector pins to prevent electrostatic discharge damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Ensure the module is fully seated in the chassis slot and the top\/bottom retaining screws are tightened to secure the module and ensure proper grounding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Use shielded cables for I\/O signals to minimize EMI interference. Keep high-voltage AC wiring separate from low-voltage signal wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironment:\u003c\/strong\u003e Ensure the installation location provides adequate ventilation to maintain the operating temperature within the specified range.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eWhat is the primary function of the 1746-IO4?\u003c\/h3\u003e\u003cp\u003eThe 1746-IO4 acts as a combination I\/O module for the SLC 500 system, providing two AC inputs for sensors and two relay outputs for switching external devices.\u003c\/p\u003e\u003ch3\u003eCan the relay outputs switch DC loads?\u003c\/h3\u003e\u003cp\u003eYes, the relay contacts are \"dry\" and can switch both AC and DC voltages within the specified ranges (5–265V AC or 5–125V DC).\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":50733986087164,"sku":"1746-IO4","price":86.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_009057b8-1197-4a81-8b73-e2f996ae4185.jpg?v=1785291705","url":"https:\/\/www.electronicplc.com\/es\/products\/allen-bradley-1746-io4-combination-i-o-module","provider":"Electronic PLC","version":"1.0","type":"link"}