{"product_id":"beckhoff-bk2020-lightbus-bus-coupler","title":"BECKHOFF BK2020 Lightbus Bus Coupler","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBECKHOFF BK2020\u003c\/strong\u003e is a dedicated Lightbus Bus Coupler designed to connect the Lightbus fieldbus system to modular BECKHOFF Bus Terminals. The coupler acts as a decentralized gateway, converting physical optical signals from the Lightbus ring into the internal K-bus protocol used by the connected I\/O terminals. It manages process data exchange and provides diagnostic functions for the local terminal assembly.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eBECKHOFF BK2020\u003c\/strong\u003e supports standard K-bus terminals, accommodating a direct connection of up to 64 modules. With a K-bus extension system, the configuration can expand to support up to 255 Bus Terminals. The integrated optical fiber interface offers excellent immunity to electromagnetic interference, ensuring stable, high-speed communication over varying physical distances.\u003c\/p\u003e\n\n\u003cp\u003eFor system deployment, the coupler includes an integrated power supply unit. This unit draws from a 24 V DC source to supply power to both the internal coupler and K-bus electronics, while also feeding the integrated power contacts to distribute 24 V DC power to the field-side terminal electronics.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect connection interface for up to 64 BECKHOFF Bus Terminals, expandable to 255 with K-bus extension.\u003c\/li\u003e\n  \u003cli\u003eLightbus fiber optic communication interface with dual standard optical connectors.\u003c\/li\u003e\n  \u003cli\u003eHigh noise immunity due to optical fiber transmission line.\u003c\/li\u003e\n  \u003cli\u003eIntegrated power supply unit providing up to 1750 mA current supply for connected K-bus terminals.\u003c\/li\u003e\n  \u003cli\u003eBuilt-in 24 V DC power contacts for local power distribution to field-side terminals.\u003c\/li\u003e\n  \u003cli\u003eConfiguration and diagnostics supported via KS2000 software or directly through the master controller.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDecentralized industrial automation systems requiring high electromagnetic compatibility (EMC).\u003c\/li\u003e\n  \u003cli\u003eMachine control architectures utilizing the Lightbus fiber optic communication ring.\u003c\/li\u003e\n  \u003cli\u003eDistributed I\/O processing where electrical isolation and noise rejection are critical.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch4\u003eGeneral\u003c\/h4\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\u003eManufacturer\u003c\/td\u003e\n      \u003ctd\u003eBECKHOFF\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eModel\u003c\/td\u003e\n      \u003ctd\u003eBK2020\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003eLightbus Bus Coupler\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNumber of Bus Terminals\u003c\/td\u003e\n      \u003ctd\u003e64 (up to 255 with K-bus extension)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eConfiguration Method\u003c\/td\u003e\n      \u003ctd\u003eVia KS2000 software or the controller\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eElectrical Data\u003c\/h4\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\u003ePower Supply Voltage\u003c\/td\u003e\n      \u003ctd\u003e24 V DC (-15% \/ +20%)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInput Current\u003c\/td\u003e\n      \u003ctd\u003e70 mA + (total K-bus current)\/4, max. 500 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eStarting Current\u003c\/td\u003e\n      \u003ctd\u003eApprox. 2.5 x continuous current\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCurrent Supply K-Bus\u003c\/td\u003e\n      \u003ctd\u003e1750 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePower Contacts Voltage\u003c\/td\u003e\n      \u003ctd\u003eMax. 24 V DC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePower Contacts Current Load\u003c\/td\u003e\n      \u003ctd\u003eMax. 10 A\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eElectrical Isolation\u003c\/td\u003e\n      \u003ctd\u003e500 V (power contact \/ supply voltage)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eRecommended Fuse\u003c\/td\u003e\n      \u003ctd\u003eLess than or equal to 10 A\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eFieldbus and Communication\u003c\/h4\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\u003eBus Interface\u003c\/td\u003e\n      \u003ctd\u003e2 x standard fibre optic connector (Z1000 plastic, Z1010 HCS)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMax. Fieldbus Process Image\u003c\/td\u003e\n      \u003ctd\u003e512 bytes input \/ 512 bytes output\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eDigital Peripheral Signals\u003c\/td\u003e\n      \u003ctd\u003eUp to 1,020 inputs\/outputs\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAnalog Peripheral Signals\u003c\/td\u003e\n      \u003ctd\u003eUp to 128 inputs\/outputs\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eDistance Between Stations\u003c\/td\u003e\n      \u003ctd\u003e45 m for APF plastic fibre, 300 m for HCS fibre\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003ePhysical and Environmental\u003c\/h4\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\u003eDimensions (W x H x D)\u003c\/td\u003e\n      \u003ctd\u003eApprox. 50 mm x 100 mm x 68 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eWeight\u003c\/td\u003e\n      \u003ctd\u003eApprox. 150 g\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOperating Temperature\u003c\/td\u003e\n      \u003ctd\u003e0 to 55 degC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eStorage Temperature\u003c\/td\u003e\n      \u003ctd\u003e-25 to 85 degC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eRelative Humidity\u003c\/td\u003e\n      \u003ctd\u003e95%, non-condensing\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVibration and Shock Resistance\u003c\/td\u003e\n      \u003ctd\u003eConforms to EN 60068-2-6 \/ EN 60068-2-27\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eEMC Immunity and Emission\u003c\/td\u003e\n      \u003ctd\u003eConforms to EN 61000-6-2 \/ EN 61000-6-4\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProtection Class\u003c\/td\u003e\n      \u003ctd\u003eIP20\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInstallation Position\u003c\/td\u003e\n      \u003ctd\u003eVariable\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure all electrical power supplies are de-energized before beginning installation or maintenance tasks.\u003c\/li\u003e\n  \u003cli\u003eMount the coupler onto a standard 35 mm DIN rail (EN 60715) by snapping it firmly into place.\u003c\/li\u003e\n  \u003cli\u003eSlide the required Bus Terminals onto the DIN rail from the right side, making sure they engage securely with the K-bus contacts of the coupler.\u003c\/li\u003e\n  \u003cli\u003eConnect the incoming and outgoing Lightbus fiber optic cables to the dual optical connectors, ensuring clean fiber ends and correct bend radiuses.\u003c\/li\u003e\n  \u003cli\u003eConnect the 24 V DC power source to the terminal connection points for both the coupler electronics and the power contacts.\u003c\/li\u003e\n  \u003cli\u003eVerify that the ground (PE) connection is properly established to maintain EMC compliance.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eReplacement Recommendations\u003c\/h3\u003e\n\u003cp\u003eWhen replacing an existing \u003cstrong\u003eBECKHOFF BK2020\u003c\/strong\u003e, document the physical arrangement of all connected Bus Terminals and record configuration settings before removal. Power down the system completely. Disconnect all wiring and fiber optic cables, paying special attention to transmitter and receiver fiber assignments. Release the coupler from the DIN rail, slide the new unit into place, reattach the terminal block, and restore the electrical and optical connections. Re-apply power and verify proper optical ring status and K-bus communication indicators.\u003c\/p\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106509218155,"sku":"BK2020","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bk2020-g40jzecgzcg.png?v=1776243448","url":"https:\/\/www.plcprotech.com\/products\/beckhoff-bk2020-lightbus-bus-coupler","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}