{"product_id":"allen-bradley-1771-db-plc-5-basic-communication-module","title":"Allen-Bradley 1771-DB PLC-5 BASIC Communication Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-DB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides a powerful BASIC-language programming environment within the Allen-Bradley PLC-5 chassis. This module handles complex mathematical calculations, string manipulations, and custom serial protocols that standard ladder logic cannot efficiently execute. We supply this unit in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econdition, providing a vital solution for plants maintaining legacy infrastructure that requires specialized ASCII or DH485 data processing.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\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\u003ePart Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1771-DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBASIC Programmable Module\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCommunication Ports\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3 (DH485, PRT1, PRT2)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current Load\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.75 Amps @ 5VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePlatform Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUniversal 1771 I\/O \/ PLC-5 Systems\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePort Types\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRS-232-C, RS-422, and RS-485\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.73 kg (1.61 lbs)\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\u003eLED displays for Run, Fault, and Port Activity\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\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOffload Complex Computation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1771-DB contains its own microprocessor to execute BASIC code. This design offloads floating-point math and reporting tasks from the main PLC-5 processor, preventing scan-time degradation in high-speed applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCustom Protocol Flexibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe PRT1 and PRT2 ports allow engineers to write custom drivers for third-party hardware, such as bar code scanners, weigh scales, or printers. This capability bridges the gap between the PLC backplane and non-Rockwell peripheral devices.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNon-Volatile Memory Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module stores user programs in battery-backed RAM or optional EPROM. This ensures the system retains critical logic and communication parameters during total power loss on the factory floor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSimplified Data Interfacing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUtilizing the DH485 port, the 1771-DB integrates easily into local operator interface networks. It acts as a data concentrator, gathering information from multiple sources and presenting a unified data block to the host controller.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I program the 1771-DB module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYou connect a terminal or a PC running terminal emulation software to the PRT1 port. The module utilizes a specialized BASIC instruction set optimized for industrial I\/O, allowing you to read and write directly to the PLC-5 data table.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a faulty 1771-DB without changing the PLC program?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. As long as you load the original BASIC source code into the new\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-DB\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand match the jumper settings for the communication ports, the PLC-5 processor will recognize the module via the same backplane addresses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the power considerations for a full 1771 rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1771-DB pulls a significant 0.75A from the 5VDC backplane. When installing this module, you must verify that your 1771-P4, P5, or P7 power supply has sufficient headroom to support this load alongside your existing I\/O modules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this brand-new unit include the original internal battery?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the unit is brand new, we recommend installing a fresh 1771-BA battery upon commissioning to ensure maximum memory retention life, as the module relies on this battery to maintain the BASIC program during power-down cycles.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53410938978488,"sku":"1771-DB","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1771-DB.jpg?v=1777278150","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1771-db-plc-5-basic-communication-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}