{"product_id":"1771-db-b-allen-bradley-basic-module","title":"1771-DB\/B Allen-Bradley BASIC Module","description":"\u003ch2\u003eAllen-Bradley 1771-DB\/B BASIC Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for local BASIC and C program execution in PLC-1771 I\/O chassis systems, the \u003cstrong\u003eAllen-Bradley 1771-DB\/B\u003c\/strong\u003e (\u003cstrong\u003e1771-DB\u003c\/strong\u003e BASIC Module) provides direct physical\/electrical execution for custom processing routines, serial communication handling, and local data operations through the 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\/B\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\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\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSeries B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor\u003c\/td\u003e\n\u003ctd\u003eOnboard microprocessor with up to 4x execution speed compared with Series A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory\u003c\/td\u003e\n\u003ctd\u003e24 KB RAM, EPROM and EEPROM support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgramming Languages\u003c\/td\u003e\n\u003ctd\u003eBASIC (Intel BASIC 52 subset), C programming support through external toolkit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eDH-485, PRT1, PRT2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Interfaces\u003c\/td\u003e\n\u003ctd\u003eRS-232, RS-422, RS-485 configurable ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eOne-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 PLC Backplane Communication Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1771-DB\/B module operates as a local processing extension for Allen-Bradley PLC-1771 platforms. Its backplane interface provides communication with the PLC chassis while onboard firmware manages BASIC execution, serial port handling, and diagnostic functions. The module supports I\/O density scaling through local processing distribution, allowing application routines to execute independently from the primary PLC processor.\u003c\/p\u003e\n\u003cp\u003eThe communication subsystem includes DH-485 connectivity and configurable PRT1\/PRT2 serial channels. These ports support ASCII and DF1 communication functions with selectable RS-232, RS-422, or RS-485 electrical interfaces. Firmware compatibility includes Series B execution enhancements, additional BASIC commands, and expanded memory handling.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What backplane power requirement applies to the 1771-DB\/B module?\u003cbr\u003eA: The module requires 0.75 A at 5 VDC from the PLC-1771 I\/O chassis backplane.\u003c\/p\u003e\n\u003cp\u003eQ: Which communication ports are available on the 1771-DB\/B?\u003cbr\u003eA: The module provides DH-485, PRT1, and PRT2 ports. PRT1 and PRT2 support configurable RS-232, RS-422, or RS-485 communication.\u003c\/p\u003e\n\u003cp\u003eQ: What programming storage methods are supported by the 1771-DB\/B?\u003cbr\u003eA: The module supports battery-backed RAM operation and external EPROM\/EEPROM storage for program retention.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-DB\/B module into a compatible PLC-1771 I\/O chassis slot using the correct keying plugs before applying chassis power. Verify backplane power availability and confirm the module position matches the system configuration.\u003c\/p\u003e\n\u003cp\u003eUse ESD protection when handling the module. Route DH-485 and serial communication wiring separately from high-voltage conductors and high-current switching cables. Maintain proper cable shielding and grounding practices to reduce electrical interference on RS-232, RS-422, and RS-485 communication lines.\u003c\/p\u003e\n\u003cp\u003eLoad application programs through the supported programming interface and verify communication port configuration before placing the module into operational service.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43668231127130,"sku":"1771-DB\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-DBA1.jpg?v=1784268152","url":"https:\/\/www.plcmasters.com\/products\/1771-db-b-allen-bradley-basic-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}