{"product_id":"1771-db-a-allen-bradley-basic-module","title":"1771-DB\/A Allen-Bradley BASIC Module","description":"\u003ch2\u003eAllen-Bradley 1771-DB\/A BASIC Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-DB\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-DB\u003c\/strong\u003e BASIC Module, operates as a dedicated hardware component for BASIC language execution and serial data communication within PLC-1771 control systems. The module provides onboard processing, RS-232\/RS-422 communication interfaces, and local program execution through the 1771 I\/O chassis backplane.\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-DB\/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\u003e1.61 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e5.1 cm x 27.9 cm x 17.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.75 A at 5 VDC from 1771 chassis backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eBASIC Programming Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor\u003c\/td\u003e\n\u003ctd\u003eOnboard microprocessor with BASIC language execution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory\u003c\/td\u003e\n\u003ctd\u003eBattery-backed RAM and EPROM program storage support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eTwo serial ports supporting RS-232\/RS-422 communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eSingle-slot installation in PLC-1771 I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP and Serial Communication Interface Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1771-DB\/A module provides local serial communication functions through dedicated Program and Peripheral ports. The Program Port supports BASIC program entry, editing, and debugging operations, while the Peripheral Port supports connection to external serial devices such as printers, recorders, and RS-422 equipment. Data transmission control includes XON\/XOFF flow control functions for serial communication management.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What type of backplane power does the 1771-DB\/A require?\u003cbr\u003eA: The module receives power from the 1771 I\/O chassis backplane and requires 0.75 A at 5 VDC.\u003c\/p\u003e\n\u003cp\u003eQ: Which communication interfaces are available on the 1771-DB\/A?\u003cbr\u003eA: The module provides two serial communication ports supporting RS-232\/RS-422 functions, including a Program Port and a Peripheral Port.\u003c\/p\u003e\n\u003cp\u003eQ: How is the BASIC program retained during power interruption?\u003cbr\u003eA: The module uses battery-backed RAM and EPROM support for program storage retention.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-DB\/A module into a compatible PLC-1771 I\/O chassis slot using the correct keying configuration to prevent incorrect insertion. Disconnect chassis power before installation or removal procedures.\u003c\/p\u003e\n\u003cp\u003eUse ESD protection when handling the module circuit assembly. Route serial communication cables separately from high-voltage power wiring and high-current switching conductors to reduce electrical interference. Connect cable shields according to site grounding practices, maintaining proper signal reference paths for RS-232\/RS-422 communication wiring.\u003c\/p\u003e\n\u003cp\u003eVerify the chassis backplane power capacity before installation and confirm that the module configuration matches the application requirements before loading BASIC programs through the Program Port.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43668227326042,"sku":"1771-DB\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-DBA2.jpg?v=1784268152","url":"https:\/\/www.plcmasters.com\/products\/1771-db-a-allen-bradley-basic-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}