{"product_id":"4-20ma-output-interface-new-allen-bradley-1771-ofe1","title":"4-20mA Output Interface New | Allen-Bradley 1771-OFE1","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1771-OFE1\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eacts as the critical bridge between digital PLC-5 logic and analog field instrumentation. This module converts 12-bit digital values from the processor into precise analog voltage (0-10V DC) or current (4-20mA) signals. Engineers utilize the 1771-OFE1 to drive proportional valves, variable frequency drives (VFDs), and analog actuators. By providing two fully isolated channels, the module ensures independent control loops remain stable and free from cross-channel interference in complex automation architectures.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eWe supply this module in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal condition, ensuring 12-bit precision and factory-calibrated accuracy for high-stakes control loops.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Outputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 Isolated Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Voltage Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 10 Volts DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Current Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 to 20 Milliamperes\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12-Bit (1 part in 4096)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e+\/- 0.1 percent of full scale\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOptical Isolation between backplane and outputs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.2 Amps at 5 Volts DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 degrees C (32 to 140 degrees F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to 85 degrees C (-40 to 185 degrees F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStatus Indicators\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIndividual Channel LEDs\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe 1771-OFE1 solves common signal integrity issues found in distributed industrial environments:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTotal Signal Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOptical isolation safeguards the PLC-5 backplane from electrical surges and ground loops originating at the field device. This protection prevents field-side electrical noise from corrupting processor logic or damaging adjacent modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Resolution Precision:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 12-bit digital-to-analog converter provides 4,096 discrete steps across the output range. This granularity allows for ultra-smooth valve positioning and precise motor speed modulation, reducing mechanical wear on field assets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Field Matching:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module supports both voltage and current signals. This flexibility allows engineers to standardize on a single spare part to support different types of field equipment, whether the application requires a 0-10V speed reference or a 4-20mA valve command.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Downtime Maintenance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe removable wiring arm allows technicians to swap the module in seconds. Because the field wiring stays attached to the arm, you eliminate the risk of wiring errors during replacement and significantly reduce Mean Time to Repair (MTTR).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan I output 0-10V and 4-20mA simultaneously on different channels?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Each of the two channels operates independently. You can configure one channel for voltage control and the other for current control to suit the specific requirements of your connected field devices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1771-OFE1 require an external power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the module draws its logic power (1.2A) from the 1771 chassis backplane, some analog loop configurations may require an external DC power supply to drive the 4-20mA current loop through high-impedance loads. Always verify the total loop resistance against the module's driving capacity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I verify the status of the analog outputs without a laptop?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe front panel features status LEDs for each channel. These indicators provide immediate visual confirmation of the module's operational state, allowing maintenance personnel to quickly distinguish between a module failure and a field-side wiring break.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this module compatible with SLC-500 systems?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1771-OFE1 is a 1771-series module designed for PLC-5 chassis. However, you can use it in distributed I\/O systems connected to SLC-500 or ControlLogix processors if you utilize a 1771-ASB (Remote I\/O) or 1771-ACN (ControlNet) adapter.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43377837047898,"sku":"1771-OFE1","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/24_3c8e81be-47ce-481f-820c-b96fffa8e4fa.jpg?v=1778813251","url":"https:\/\/www.spareoil.com\/products\/4-20ma-output-interface-new-allen-bradley-1771-ofe1","provider":"SpareOil Automation","version":"1.0","type":"link"}