{"product_id":"1771-id-isolated-ac-dc-input-module-allen-bradley","title":"1771-ID Isolated AC\/DC Input Module Allen-Bradley","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003eAllen-Bradley 1771-ID\u003c\/strong\u003e\u003c\/span\u003e is a 6-channel individually isolated discrete AC\/DC input module built for the PLC-5 \/ 1771 Universal I\/O architecture. Operating across a flexible 92 to 138 Vac (47–63 Hz) and 92 to 138 Vdc operating voltage window, each input point provides complete channel-to-channel opto-electrical isolation rated at 1500 Vac (rms). The \u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003e1771-ID\u003c\/strong\u003e\u003c\/span\u003e is engineered for multi-phase and mixed-potential industrial sensing applications requiring high signal noise immunity and independent power source interfacing.\u003c\/p\u003e\n\n\u003cp\u003eDesigned for installation into any standard 1771 I\/O chassis slot, the module interfaces with field devices via the 1771-WD Field Wiring Arm. The internal input circuitry features built-in active filtering that eliminates electrical noise and mechanical contact bounce from pushbuttons, limit switches, float switches, and selector controls. Drawing just 74 mA backplane current at 5 Vdc, it delivers efficient multi-channel isolation while minimizing overall chassis power supply loading.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features and Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndividual Channel Isolation:\u003c\/strong\u003e 6 fully isolated input points (1500 Vac rms rating) enable operation across independent multi-phase power sources.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual AC\/DC Voltage Operation:\u003c\/strong\u003e Handles 92–138 Vac and 92–138 Vdc signal levels seamlessly without hardware configuration jumper changes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Contact Filtering:\u003c\/strong\u003e Built-in RC input filter networks reject contact bounce and voltage transients caused by noisy industrial switching.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Backplane Current Draw:\u003c\/strong\u003e Consumes only 74 mA from the 1771 chassis backplane bus, reducing total system power consumption.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModular 1771-WD Wiring Arm:\u003c\/strong\u003e Permits fast module replacement without disconnecting individual field wires from terminal screws.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Heat Generation:\u003c\/strong\u003e Thermal dissipation ranges from 1.3 to 15.0 BTU\/hr (0.4 to 4.4 W), preserving cabinet cooling margins.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eDetailed mechanical, electrical, and environmental parameters for the \u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003eAllen-Bradley 1771-ID\u003c\/strong\u003e\u003c\/span\u003e are organized below:\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color: #f2f2f2;\"\u003e\n      \u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/th\u003e\n      \u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n      \u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"3\"\u003e\u003cstrong\u003eCore Platform\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eManufacturer \u0026amp; Line\u003c\/td\u003e\n      \u003ctd\u003e\n\u003cstrong\u003eAllen-Bradley\u003c\/strong\u003e \/ Rockwell Automation (PLC-5 \/ 1771 Product Bulletin)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePart Number \u0026amp; UPC\u003c\/td\u003e\n      \u003ctd\u003e\n\u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003e1771-ID\u003c\/strong\u003e\u003c\/span\u003e (UPC: 662468205511)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eModule Type\u003c\/td\u003e\n      \u003ctd\u003eIndividually Isolated Discrete Input Module (6 Channels)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"4\"\u003e\u003cstrong\u003eElectrical Characteristics\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n      \u003ctd\u003e92 to 138 Vac (47–63 Hz) \/ 92 to 138 Vdc\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNominal Input Current\u003c\/td\u003e\n      \u003ctd\u003e8 mA @ 120 Vac; 8 mA @ 120 Vdc\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOff-State Leakage Current\u003c\/td\u003e\n      \u003ctd\u003e1.7 mA maximum (AC and DC off-state threshold)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eChannel Isolation \u0026amp; Backplane\u003c\/td\u003e\n      \u003ctd\u003e1500 Vac rms opto-isolation; 74 mA @ 5 Vdc backplane current draw\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"3\"\u003e\u003cstrong\u003eTiming \u0026amp; Thermal Limits\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eAC Signal Propagation Delay\u003c\/td\u003e\n      \u003ctd\u003e24 ms (±10 ms) ON delay; 24 ms (±10 ms) OFF delay\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eDC Signal Propagation Delay\u003c\/td\u003e\n      \u003ctd\u003e10 ms (±4 ms) ON delay; 20 ms (±9 ms) OFF delay\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eThermal \u0026amp; Power Dissipation\u003c\/td\u003e\n      \u003ctd\u003e0.4 to 4.4 W max power; 1.3 to 15.0 BTU\/hr thermal dissipation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"2\"\u003e\u003cstrong\u003eMechanics \u0026amp; Hardware\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eWiring \u0026amp; Screw Torque\u003c\/td\u003e\n      \u003ctd\u003eCat. No. 1771-WD Field Wiring Arm; 7–9 in-lbs terminal screw torque\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSlot Keying \u0026amp; Weight\u003c\/td\u003e\n      \u003ctd\u003eKeying bands between 4 \u0026amp; 6 and 28 \u0026amp; 30; Weight: 1.00 lbs (0.45 kg)\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e\u003cstrong\u003eTarget Equipment and Application Scenarios\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSensing multi-phase field contact states where phase-to-phase potential differences exist between input channels.\u003c\/li\u003e\n  \u003cli\u003eMonitoring high-voltage AC\/DC float switches, heavy-duty limit switches, selector switches, and plant pushbuttons.\u003c\/li\u003e\n  \u003cli\u003eSubstation and power generation control rooms where field signals originate from separate utility DC battery banks.\u003c\/li\u003e\n  \u003cli\u003eLegacy PLC-5 rack maintenance and retrofit projects across chemical processing, metallurgy, and pulp \u0026amp; paper plants.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eDiagnostic Capabilities and Signal Analysis\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003eAllen-Bradley 1771-ID\u003c\/strong\u003e\u003c\/span\u003e incorporates individual channel status LEDs on the front bezel to assist field technicians during commissioning and fault tracing. Each LED turns on when the corresponding input channel senses valid AC or DC voltage above the 92 V threshold. Because each point is galvanically isolated, measuring voltage directly at the 1771-WD wiring arm terminals confirms field loop integrity without risk of back-feeding or ground loops into adjacent monitoring channels.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGlobal PLC Spare HUB's Insight \u0026amp; Field Experience\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWhen installing or replacing the \u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003e1771-ID\u003c\/strong\u003e\u003c\/span\u003e, always double-check the mechanical chassis keying plastic bands (positions 4 to 6 and 28 to 30). Correct keying prevents accidental insertion of standard non-isolated 120V or low-voltage DC modules into a high-potential isolated slot, protecting backplane logic from destructive ground faults.\u003c\/p\u003e\n\n\u003cp\u003eFor field connections, use 14 AWG solid or stranded copper wire with a maximum insulation thickness of 3\/64 inches. When securing field leads to the 1771-WD wiring arm, maintain terminal screw torque strictly between 7 and 9 in-lbs (0.8 to 1.0 N·m) to prevent strip-threading or loose high-resistance wiring connections during prolonged plant vibration.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompliance, Shipping, and Warranty Terms\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 x New factory-sealed \u003cspan style=\"color: #d9534f;\"\u003e\u003cstrong\u003eAllen-Bradley 1771-ID\u003c\/strong\u003e\u003c\/span\u003e 6-channel isolated input module in original box.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarranty Coverage:\u003c\/strong\u003e Backed by a full 12-month replacement warranty starting from the purchase invoice date.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExpress Global Courier:\u003c\/strong\u003e Ships within 24–48 hours via premium express services including FedEx, UPS, and DHL worldwide.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestion: What is the primary operational advantage of channel-to-channel isolation on this input unit?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAnswer: Individual isolation allows each channel to interface with completely separate power sources or different line phases without electrical interference or ground loop hazards.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestion: Can I connect 120 Vac signals to Channel 0 and 120 Vdc signals to Channel 1 on the same module?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAnswer: Yes, because every channel is independently isolated up to 1500 Vac, mixed AC and DC input sources can be wired simultaneously across different points.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestion: What specific field wiring arm is required to mate with this 1771 module?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAnswer: This module uses the Allen-Bradley 1771-WD Field Wiring Arm, which permits terminal wiring retention during card swap-outs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestion: Why are input signal delays longer on AC inputs compared to DC inputs on this hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAnswer: The AC input delay (24 ms) incorporates extra RC filtering time to smooth out 50\/60 Hz sine-wave zero-crossings and contact chatter from field switches.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestion: How much backplane current must be allocated for this card when sizing the 1771 chassis power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eAnswer: You must budget 74 mA of 5 Vdc backplane current for each card installed in the PLC-5 chassis layout.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013911404726,"sku":"1771-ID","price":137.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1771-ID_fe643087-b1ad-4f93-b6db-e8796952f759.jpg?v=1785138568","url":"https:\/\/www.plcsparehub.com\/products\/1771-id-isolated-ac-dc-input-module-allen-bradley","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}