{"product_id":"1771-ofe2-ab-4-20ma-voltage-isolated-analog-output-module","title":"1771-OFE2 AB 4-20mA Voltage Isolated Analog Output Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1771-OFE2 acts as a high-precision digital-to-analog converter within the legacy PLC-5 control system architecture. This module converts digital values from the PLC processor into highly accurate analog current or voltage signals to manage field devices. It serves as a critical link between central processing racks and variable field instruments like control valves, actuators, and motor drives. We supply this product as a 100% brand new, original unit to secure long-term operational uptime for existing factory automation infrastructures.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThis module interfaces directly with standard 1771 I\/O chassis slots and relies on the following verified engineering parameters:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Type:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAnalog Output Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSystem Compatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePLC-5 Controllers \/ 1771 I\/O Chassis\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAnalog Outputs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e4 Points (Configurable for 2 Active Channels)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Ranges:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e4 to 20 mA Current Loop \/ +\/-10 VDC Voltage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDAC Resolution:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e12-Bit Binary\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Accuracy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e+\/-0.1% of Full Scale\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Load Impedance (Voltage):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGreater than or equal to 1 kOhm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Load Impedance (Current):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eLess than or equal to 750 Ohm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eElectrical Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOptical\/Galvanic Isolation between Channels and Backplane\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Response Time:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eLess than 1 ms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current Draw:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.2 A to 1.4 A at 5 VDC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e0 to 60 degrees Celsius\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e-40 to 85 degrees Celsius\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRelative Humidity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e5% to 95% Non-condensing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Compliance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUL, CSA, and CE Compliant\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OFE2 solves distinct electrical and environmental challenges on the factory floor through targeted hardware design choices:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEliminating Ground Loops:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIndustrial plants feature long cable runs that generate dangerous ground potential differences. This module integrates robust optical galvanic isolation between the output channels and the backplane logic. This barrier blocks high-voltage transients, prevents ground loop noise from corrupting PLC registers, and safeguards the central PLC-5 processor rack.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOvercoming Signal Interference:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eHigh-power motor drives and switchgear create extreme electromagnetic interference (EMI) in modern factory automation environments. The 12-bit resolution and stable internal circuitry of the 1771-OFE2 generate clean, steady 4-20mA current signals that resist long-distance environmental EMI noise, ensuring precise positioning of downstream control valves.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRapid Diagnostic Troubleshooting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUnplanned downtime costs industrial facilities thousands of dollars per hour. The front panel incorporates active LED diagnostic indicators that display channel status at a glance. Field technicians can instantly isolate whether a signal loss stems from internal module faults or external field wiring breaks without deploying specialized metering tools.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this 1771-OFE2 module arrive in 100% brand new condition?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eYes. We ship this product as a 100% brand new, original unit in its original packaging. It has never seen service on a factory floor and contains zero refurbished components.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan the module drive both voltage and current loops simultaneously?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module hardware design allows engineers to configure channels for either current (4-20 mA) or voltage (+\/-10 VDC) ranges. You must match the external field wiring terminals and PLC configuration blocks to the specific signal type required by your actuator or drive.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1771-OFE2 require an independent external power supply?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module draws its primary operating power (up to 1.4 A) directly from the 1771 I\/O chassis backplane power supply. However, you must ensure your existing chassis power supply has sufficient headroom to support this current draw alongside your other installed PLC-5 modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43401149251674,"sku":"1771-OFE2","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/30_cb269e1a-c579-4ba8-b428-e149553ac8d6.jpg?v=1779352339","url":"https:\/\/www.spareoil.com\/products\/1771-ofe2-ab-4-20ma-voltage-isolated-analog-output-module","provider":"SpareOil Automation","version":"1.0","type":"link"}