{"product_id":"allen-bradley-1771-obds-a-digital-dc-output-module","title":"Allen Bradley 1771-OBDS\/A Digital DC Output Module","description":"\u003ch2\u003eAllen Bradley 1771-OBDS\/A Digital DC Output Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen Bradley 1771-OBDS\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-OBDS\u003c\/strong\u003e Digital DC Output Module, operates as a dedicated hardware component for discrete DC load switching within PLC-5 1771 I\/O chassis platforms. The module provides sixteen sourcing outputs with current limiting, opto-electrical isolation, and PLC backplane communication.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1771-OBDS\/A\u003c\/td\u003e\n\u003c\/tr\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.85 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane current: 300 mA to 400 mA at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital DC Output Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003ePLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e16 Outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eSourcing DC digital output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Category\u003c\/td\u003e\n\u003ctd\u003e10-60 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10-40 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Continuous Current Per Output\u003c\/td\u003e\n\u003ctd\u003e1 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Resistive Current Per Output\u003c\/td\u003e\n\u003ctd\u003e2 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Continuous Current Per Module\u003c\/td\u003e\n\u003ctd\u003e8 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot Duty Current\u003c\/td\u003e\n\u003ctd\u003e0.2 A per output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Format\u003c\/td\u003e\n\u003ctd\u003eBDC or Natural Binary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Arm Compatibility\u003c\/td\u003e\n\u003ctd\u003e1771-WH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOpto-electrical isolation tested to 1500 V AC rms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Feature\u003c\/td\u003e\n\u003ctd\u003eCurrent limiting output protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eConformal coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003eRack mountable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eESD Immunity\u003c\/td\u003e\n\u003ctd\u003e4 kV contact discharge; 8 kV air discharge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Digital Output Switching Interface\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OBDS\/A provides sixteen individually controlled sourcing DC outputs for PLC-5 controller applications. Each output channel sources current to connected DC field devices and includes current-limiting protection for overload and short-circuit conditions.\u003c\/p\u003e\n\u003cp\u003eThe module communicates through the 1771 chassis backplane and supports BDC and Natural Binary data formats. Output data received from the PLC processor is converted into discrete switching states for connected field circuits.\u003c\/p\u003e\n\u003cp\u003eThe conformal coating protects the module electronics from environmental contamination during industrial installation. Opto-electrical isolation separates field-side output circuits from internal PLC logic circuitry.\u003c\/p\u003e\n\u003ch3\u003eIndustrial Control and Backplane Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OBDS\/A uses PLC-5 backplane bus communication for deterministic I\/O data exchange. The sixteen-point output structure supports PLC-5 I\/O density scaling within compatible 1771 chassis configurations.\u003c\/p\u003e\n\u003cp\u003eThe module supports Ethernet\/IP or Profinet network architectures only through PLC-5 system-level communication interfaces; the module itself operates as a chassis-based I\/O component. Firmware flash compatibility is not specified for this hardware generation.\u003c\/p\u003e\n\u003cp\u003eConfiguration requires correct chassis slot assignment, controller compatibility, and I\/O addressing within the PLC-5 processor program.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many output points are available on the 1771-OBDS\/A module?\u003cbr\u003eA: The module provides sixteen sourcing DC digital output channels.\u003c\/p\u003e\n\u003cp\u003eQ: What voltage range is supported by the 1771-OBDS\/A outputs?\u003cbr\u003eA: The module supports a 10-60 VDC output voltage category with a specified operating range of 10-40 VDC.\u003c\/p\u003e\n\u003cp\u003eQ: What protection functions are integrated into the output channels?\u003cbr\u003eA: Each output includes current-limiting protection for overload and short-circuit conditions.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-OBDS\/A module in a compatible 1771 I\/O chassis slot and verify chassis keying before insertion. Connect field wiring through the 1771-WH wiring arm and confirm correct sourcing output polarity.\u003c\/p\u003e\n\u003cp\u003eRoute DC output wiring separately from high-voltage conductors, motor cables, and high-frequency switching circuits. Apply standard industrial grounding practices for cable shields where shielded wiring is used.\u003c\/p\u003e\n\u003cp\u003eVerify connected loads remain within the specified output current limits. Check PLC-5 configuration parameters, I\/O addressing, and controller communication before enabling field outputs.\u003c\/p\u003e\n\u003cp\u003eFollow electrostatic discharge handling procedures during module installation and maintenance.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43685305548890,"sku":"1771-OBDS\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-OBDSA.jpg?v=1784617971","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1771-obds-a-digital-dc-output-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}