{"product_id":"allen-bradley-1771-oad-plc-5-digital-output-module","title":"Allen-Bradley 1771-OAD PLC-5 Digital Output Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-OAD\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771OAD\u003c\/strong\u003e Digital Output Module, operates as a dedicated hardware component for switching AC field devices through 16 discrete output channels within PLC-5 I\/O chassis platforms.\u003c\/p\u003e\n\u003ch3\u003eModel Configuration Reference\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OAD is a PLC-5 AC digital output module providing sixteen output points for controlling AC loads. The module uses solid-state triac output technology with zero-crossing switching characteristics for AC voltage control applications.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\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-OAD\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital Output Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePLC-5 \/ 1771 I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.78 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e2.8 x 15 x 25.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e13 W maximum, 1.5 W minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e48.0 BTU\/hr maximum, 5.13 BTU\/hr minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e16 AC output points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10 to 138 VAC, 47 to 63 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Voltage Category\u003c\/td\u003e\n\u003ctd\u003e12 to 120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current Rating\u003c\/td\u003e\n\u003ctd\u003e2 A per output, 8 A maximum per module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Load Current\u003c\/td\u003e\n\u003ctd\u003e5 mA per output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff State Leakage Current\u003c\/td\u003e\n\u003ctd\u003e3.0 mA maximum at 138 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e295 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003e10 A, 250 V rectifier fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Indication\u003c\/td\u003e\n\u003ctd\u003eOutput and fuse-blown indicators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Backplane Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OAD receives operating power through the Allen-Bradley 1771 I\/O chassis backplane. The module communicates output status through the PLC-5 controller architecture and provides discrete AC switching functions for connected field devices.\u003c\/p\u003e\n\u003cp\u003eThe module is compatible with 1771 I\/O chassis configurations except 1771-A1, 1771-A2, and 1771-A4 chassis models. Proper module group configuration is required when using 2-slot addressing to prevent conflicts with other output modules or single card block transfer modules.\u003c\/p\u003e\n\u003ch3\u003eSolid-State AC Switching Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OAD uses triac-based output switching with zero-crossing technology. The output device switches when the AC waveform reaches a low voltage point, reducing electrical stress caused by inrush current on connected loads.\u003c\/p\u003e\n\u003cp\u003eThe module supports AC loads within the specified voltage and current range. High impedance loads such as LED indicators or relay coils may require parallel leakage compensation components because triac outputs maintain a small off-state leakage current.\u003c\/p\u003e\n\u003ch3\u003eIndustrial Control Network and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eAllen-Bradley PLC-5 systems use modular 1771 I\/O architecture for distributed field signal handling. The 1771-OAD expands discrete output capacity by providing sixteen independent AC output channels within a single chassis slot.\u003c\/p\u003e\n\u003cp\u003eThe module operates through the PLC-5 backplane communication structure where I\/O density scaling depends on chassis layout, addressing mode, controller capacity, and installed module quantity.\u003c\/p\u003e\n\u003ch3\u003eOrdering Info\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1771-OAD PLC-5 16 Point AC Digital Output Module\u003c\/li\u003e\n\u003cli\u003e1 x Module identification label\u003c\/li\u003e\n\u003cli\u003e1 x Standard terminal interface compatibility\u003c\/li\u003e\n\u003cli\u003eField wiring arm, PLC-5 chassis, power supply, and external wiring components are not included unless separately specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eModule Installation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVerify PLC-5 chassis compatibility before mounting the module.\u003c\/li\u003e\n\u003cli\u003eConfirm that the chassis model is not 1771-A1, 1771-A2, or 1771-A4.\u003c\/li\u003e\n\u003cli\u003eInstall the module with the correct keying position and secure chassis connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eField Wiring\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConnect AC load wiring according to the assigned output terminal configuration.\u003c\/li\u003e\n\u003cli\u003eMaintain separation between AC power wiring and low-level signal wiring.\u003c\/li\u003e\n\u003cli\u003eConfirm load current requirements before connecting field devices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eLeakage Current Considerations\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReview connected load characteristics when using LED lamps or high impedance devices.\u003c\/li\u003e\n\u003cli\u003eInstall appropriate leakage compensation components when required by the application.\u003c\/li\u003e\n\u003cli\u003eVerify output status indicators after field wiring completion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat type of outputs does the 1771-OAD provide?\u003c\/p\u003e\n\u003cp\u003eThe 1771-OAD provides sixteen AC solid-state digital output channels using triac switching technology for PLC-5 control applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat voltage range does the module support?\u003c\/p\u003e\n\u003cp\u003eThe module supports AC output operation from 10 to 138 VAC at frequencies between 47 and 63 Hz.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum output current capability?\u003c\/p\u003e\n\u003cp\u003eEach output channel supports up to 2 A, with the total module current limited to 8 A.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the required backplane current?\u003c\/p\u003e\n\u003cp\u003eThe module requires 295 mA from the 1771 I\/O chassis backplane power supply.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan the module control LED loads directly?\u003c\/p\u003e\n\u003cp\u003eLED or high impedance loads may be affected by triac leakage current and may require parallel compensation resistance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhich chassis are compatible with the 1771-OAD?\u003c\/p\u003e\n\u003cp\u003eThe module is compatible with most 1771 I\/O chassis except 1771-A1, 1771-A2, and 1771-A4 chassis models.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the module provide electrical isolation?\u003c\/p\u003e\n\u003cp\u003eThe module uses solid-state AC output switching. Field circuit isolation depends on the module design and connected wiring configuration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat protection features are included?\u003c\/p\u003e\n\u003cp\u003eThe module includes fuse protection and status indication functions for output monitoring and fuse-blown detection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066443944109,"sku":"1771-OAD","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1771-OAD.jpg-0.jpg?v=1786347879","url":"https:\/\/www.maxwellplc.com\/ga\/products\/allen-bradley-1771-oad-plc-5-digital-output-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}