{"product_id":"allen-bradley-1746-ia4-discrete-ac-input-module","title":"Allen-Bradley 1746-IA4 SLC 500 Discrete AC Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Allen-Bradley 1746-IA4 is a discrete AC input module engineered for the SLC 500 programmable logic controller system. This module provides four (4) isolated input channels rated for 100\/120V AC operation. It is designed for industrial environments requiring reliable signal detection from field devices such as limit switches, pushbuttons, or auxiliary contacts. By providing a compact, four-point interface, it allows for efficient and cost-effective I\/O expansion in smaller control panels or specific machine-level applications.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFour (4) independent AC input channels.\u003c\/li\u003e\n\u003cli\u003eStandard operating voltage range of 85–132V AC.\u003c\/li\u003e\n\u003cli\u003eIntegrated hardware signal filtering with 35 ms ON and 45 ms OFF delays to mitigate contact bounce.\u003c\/li\u003e\n\u003cli\u003eFront-panel LED indicators for real-time status monitoring of each input channel.\u003c\/li\u003e\n\u003cli\u003eLow backplane power consumption (35 mA at 5V DC).\u003c\/li\u003e\n\u003cli\u003eDesigned for seamless integration into the SLC 500 chassis backplane.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThe 1746-IA4 is suitable for a wide range of industrial automation tasks, including machine control, process monitoring, and general-purpose discrete signal acquisition. It is commonly utilized in systems where AC-powered field devices must interface directly with the SLC 500 controller.\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 AC Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Category\u003c\/td\u003e\n\u003ctd\u003e100\/120V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e85–132V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Input Current\u003c\/td\u003e\n\u003ctd\u003e12 mA @ 120V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Off-State Voltage\u003c\/td\u003e\n\u003ctd\u003e30V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. Off-State Current\u003c\/td\u003e\n\u003ctd\u003e2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5V DC)\u003c\/td\u003e\n\u003ctd\u003e35 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (24V DC)\u003c\/td\u003e\n\u003ctd\u003e0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e0.175 W (Min) to 1.3 W (Max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 degC (32 to 140 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAlways remove power from the SLC 500 chassis before inserting or removing any I\/O module to prevent electrical damage.\u003c\/li\u003e\n\u003cli\u003eEnsure the module is fully seated in the chassis slot and the locking tab is engaged to maintain a secure connection to the backplane.\u003c\/li\u003e\n\u003cli\u003eUse appropriate shielded cabling for input signals to minimize interference from high-voltage lines or EMI sources.\u003c\/li\u003e\n\u003cli\u003eMaintain proper ventilation within the enclosure to ensure the module operates within its specified temperature range (0 to 60 degC).\u003c\/li\u003e\n\u003cli\u003eVerify that field wiring polarity and voltage levels match the module specifications before applying power.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eWhat is the primary function of the 1746-IA4?\u003c\/h3\u003e\u003cp\u003eThe 1746-IA4 is a digital input module that converts 120V AC signals from field devices into logic levels compatible with the SLC 500 processor.\u003c\/p\u003e\u003ch3\u003eDoes this module require external power?\u003c\/h3\u003e\u003cp\u003eThe module receives its internal logic power from the SLC 500 backplane. The field-side inputs are powered by the 120V AC source connected to the field wiring terminals.\u003c\/p\u003e\u003ch3\u003eCan this module be used with DC signals?\u003c\/h3\u003e\u003cp\u003eNo, the 1746-IA4 is specifically designed for AC signals. Using it with DC voltage may result in incorrect operation or damage to the module.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":50730730881276,"sku":"1746-IA4","price":78.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_c7677746-dd09-4b01-b074-57da4b9e7edf.jpg?v=1785225050","url":"https:\/\/www.electronicplc.com\/ar\/products\/allen-bradley-1746-ia4-discrete-ac-input-module","provider":"Electronic PLC","version":"1.0","type":"link"}