{"product_id":"allen-bradley-1790d-t8a0-8-channel-120v-ac-input-module","title":"Allen-Bradley 1790D-T8A0 | 8-Channel 120V AC Input Module","description":"\u003ch2\u003eAllen-Bradley 1790D-T8A0 - 8-Channel 120V AC Input Module\u003c\/h2\u003e\n\u003cp\u003eDirectly interface with industrial power signals using the Allen-Bradley \u003cb\u003e1790D-T8A0\u003c\/b\u003e. This specialized ArmorBlock module provides \u003cb\u003e8 digital inputs designed for 110V AC circuits\u003c\/b\u003e, allowing you to monitor line-voltage devices like contactor auxiliaries, limit switches, and selector switches directly on your DeviceNet network. With built-in status LEDs and robust isolation, it safely bridges high-voltage field devices to low-voltage control networks.\u003c\/p\u003e\n\u003ch3\u003eKey Advantages\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDirect High-Voltage Sensing:\u003c\/b\u003e Connects directly to 110V AC field devices without needing intermediate relays or voltage converters, simplifying wiring and saving panel space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRobust \u0026amp; Safe Isolation:\u003c\/b\u003e Features 1250V AC photocoupler isolation, protecting your sensitive DeviceNet network and logic from high-voltage transients and noise on the AC lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eClear Status Indication:\u003c\/b\u003e Eight individual green LEDs provide immediate visual feedback on the state of each AC input, facilitating quick diagnostics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEasy Installation:\u003c\/b\u003e Screw terminal block allows for secure and straightforward wiring of standard AC power conductors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eComplete Technical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eBrand \u0026amp; Series:\u003c\/b\u003e Allen-Bradley ArmorBlock (1790 Series)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFull Model Number:\u003c\/b\u003e 1790D-T8A0\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eModule Type:\u003c\/b\u003e 8-Point 120V AC Digital Input Module\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Voltage:\u003c\/b\u003e 85V AC to 132V AC (110V AC Nominal, 47-63 Hz)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOn-State Current:\u003c\/b\u003e 9 mA maximum @ 132V AC\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Impedance:\u003c\/b\u003e 18 kΩ\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSwitching Threshold:\u003c\/b\u003e ON: \u0026gt;85V AC, OFF: \u0026lt;45V AC\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eResponse Time:\u003c\/b\u003e Turn-ON delay: 10 ms, Turn-OFF delay: 30 ms\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eStatus Indicators:\u003c\/b\u003e 8 individual Green LEDs (one per input channel)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCommon Groups:\u003c\/b\u003e 1 point per common (8 independent commons)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDeviceNet Logic Power:\u003c\/b\u003e 24V DC (11V to 28.8V DC)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eExternal AC Power:\u003c\/b\u003e 110V AC, 60 Hz (85-132V AC, 47-63 Hz range) – Powers the input sensing circuitry.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eElectrical Isolation:\u003c\/b\u003e 1250V AC RMS (AC Inputs to internal logic)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWiring Connection:\u003c\/b\u003e Screw Terminal Block (M3.0, 7 lb-in maximum torque)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRecommended Fuse:\u003c\/b\u003e 1 A, 250V, normal blow (per input circuit or group)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWire Compatibility:\u003c\/b\u003e Copper or copper-clad aluminum conductors.\u003c\/p\u003e\n\u003ch3\u003eInstallation \u0026amp; Wiring Guide\u003c\/h3\u003e\n\u003cp\u003eMount the \u003cb\u003e1790D-T8A0\u003c\/b\u003e module on a DIN rail. Provide both \u003cb\u003e24V DC for DeviceNet logic\u003c\/b\u003e and a separate \u003cb\u003e110V AC supply for the input circuits\u003c\/b\u003e. Wire your AC field device (e.g., a normally-open contact from a motor starter) in series with the AC hot line and the module's input terminal. Connect the AC neutral\/common to the module's corresponding common terminal. Each input has its own independent common, allowing connection to different AC phases or sources. Install the recommended 1A fuse in series with each input for protection.\u003c\/p\u003e\n\u003ch3\u003ePackage \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eWhat's Included:\u003c\/b\u003e 1 x Allen-Bradley 1790D-T8A0 120V AC Input Module with terminal block.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOur Guarantee:\u003c\/b\u003e This high-voltage interface module is covered by a solid \u003cb\u003e12-month warranty\u003c\/b\u003e.\u003c\/p\u003e\n\u003ch3\u003eFast Shipping Service\u003c\/h3\u003e\n\u003cp\u003eWe ship quickly worldwide using \u003cb\u003eFedEx, UPS, and DHL\u003c\/b\u003e.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eCan this module be used with 240V AC signals?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNo.\u003c\/b\u003e The maximum rated input voltage is 132V AC. Applying 240V AC will damage the module. For higher voltages, use an interposing relay or a voltage divider designed for the specific voltage.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWhy are the response times slower than DC input modules?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe AC input circuit must rectify and filter the signal to detect its presence, which inherently takes more time. The 10-30 ms response is perfectly adequate for monitoring contactors, switches, and other electromechanical devices.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDoes it require a neutral wire for each input?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Since each input has an independent common, you need to connect the return path (neutral) for each AC circuit you are monitoring to its specific common terminal on the module.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCan I mix inputs from different AC phases?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eYes, because each input is independently isolated via the photocoupler and has its own common terminal. You can monitor devices on different phases, but you must ensure the correct neutral for each phase is connected to the corresponding common.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWhat is the external 110V AC power supply used for?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThis supply powers the internal circuitry (like the photocoupler's LED side) that senses the presence of the AC field signal. It is separate from the field AC voltage you are monitoring.\u003c\/p\u003e\n\u003cp\u003e© 2025 Ubest Automation Limited. All rights reserved.\u003cbr\u003eOriginal Source: \u003ca href=\"https:\/\/www.ubestplc.com\/\"\u003ehttps:\/\/www.ubestplc.com\/\u003c\/a\u003e\u003cbr\u003eContact: \u003ca href=\"mailto:sales@ubestplc.com\"\u003esales@ubestplc.com\u003c\/a\u003e Phone: \u003ca href=\"https:\/\/wa.me\/8618030005825\"\u003e+86 180 3000 5825\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51496577892634,"sku":"1790D-T8A0","price":194.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/6240\/4634\/files\/1790D-T8A0_3.jpg?v=1766710467","url":"https:\/\/www.ubestplc.com\/products\/allen-bradley-1790d-t8a0-8-channel-120v-ac-input-module","provider":"Ubest Automation Limited","version":"1.0","type":"link"}