{"product_id":"1771-dr-allen-bradley-plc-5-i-o-module","title":"1771-DR | Allen-Bradley | PLC-5 I\/O Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-DR\u003c\/strong\u003e is a \u003cstrong\u003edigital input module\u003c\/strong\u003e for PLC-5 1771 I\/O systems. It provides discrete signal acquisition with defined ON\/OFF current thresholds and input impedance characteristics for reliable detection of field device states in industrial control applications.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn-State Current (min):\u003c\/strong\u003e 5 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-State Current (max):\u003c\/strong\u003e 2.5 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Impedance:\u003c\/strong\u003e 22 kΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Channel-to-backplane isolation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlatform:\u003c\/strong\u003e PLC-5 \/ 1771 I\/O\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e 1771 chassis\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDefined Current Thresholds:\u003c\/strong\u003e Clear 5 mA ON \/ 2.5 mA OFF current specifications ensure reliable signal detection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate Input Impedance:\u003c\/strong\u003e 22 kΩ input impedance is compatible with a wide range of field devices\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolated Inputs:\u003c\/strong\u003e Channel-to-backplane isolation protects controller from field-side electrical disturbances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 1771 Form Factor:\u003c\/strong\u003e Compatible with all 1771-series I\/O chassis for easy integration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral-purpose discrete input interfacing\u003c\/li\u003e\n\u003cli\u003eSwitch and contact status monitoring\u003c\/li\u003e\n\u003cli\u003eRelay output feedback detection\u003c\/li\u003e\n\u003cli\u003eLegacy PLC-5 system maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Installation:\u003c\/strong\u003e Insert the 1771-DR into a compatible 1771-series I\/O chassis slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Device Verification:\u003c\/strong\u003e Confirm field devices can deliver at least 5 mA ON-state current into a 22 kΩ load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Connection:\u003c\/strong\u003e Use the appropriate 1771 wiring arm for field terminal connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Verification:\u003c\/strong\u003e Measure OFF-state current to ensure it does not exceed 2.5 mA when the device is inactive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStatus Check:\u003c\/strong\u003e Power up and verify input response matches field device states.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the input impedance of the 1771-DR?\u003c\/strong\u003e\u003cbr\u003eA: The module presents approximately 22 kΩ input impedance to field devices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the ON\/OFF current thresholds?\u003c\/strong\u003e\u003cbr\u003eA: The module requires a minimum of 5 mA for ON-state detection and guarantees OFF-state for currents below 2.5 mA.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the 1771-DR compatible with dry contact switches?\u003c\/strong\u003e\u003cbr\u003eA: Dry contacts require a voltage source in series. Verify the contact circuit can deliver sufficient current (5 mA min) when closed.\u003c\/p\u003e\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalculate field circuit current with the 22 kΩ load to ensure reliable ON-state detection\u003c\/li\u003e\n\u003cli\u003eVerify OFF-state leakage current does not exceed 2.5 mA\u003c\/li\u003e\n\u003cli\u003eFor new designs, evaluate ControlLogix or CompactLogix digital input modules with similar specifications\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53803461050552,"sku":"1771-DR","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1771-DR_r180.png?v=1784796196","url":"https:\/\/www.globalpetroparts.com\/products\/1771-dr-allen-bradley-plc-5-i-o-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}