{"product_id":"beckhoff-bk4020-interbus-bus-coupler","title":"BECKHOFF BK4020 Interbus Bus Coupler","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBECKHOFF BK4020\u003c\/strong\u003e is a high-performance Interbus Bus Coupler designed to connect modular Beckhoff Bus Terminals to the Interbus fieldbus system. Serving as the primary physical and logical link between the higher-level fieldbus network and the local K-bus, this coupler automates the mapping of digital, analog, and specialty process signals. The unit compiles these inputs and outputs into a structured process image that is transmitted over the network to the central controller.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eBECKHOFF BK4020\u003c\/strong\u003e supports standard Interbus data transfer rates of 500 kbaud. It features two 9-pin D-sub connections, consisting of a plug and socket, which include screening and a vibration lock to ensure stable and noise-immune communication in industrial environments. Up to 64 individual Bus Terminals can be connected directly to a single coupler, and this capacity can be expanded up to 255 terminals using K-bus extension modules.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect integration of BECKHOFF Bus Terminals into Interbus systems.\u003c\/li\u003e\n  \u003cli\u003eSupports up to 64 standard Bus Terminals directly, and up to 255 terminals via K-bus extension.\u003c\/li\u003e\n  \u003cli\u003eDual 9-pin D-sub connectors (plug and socket) featuring integrated screening and vibration locks.\u003c\/li\u003e\n  \u003cli\u003eAutomatic configuration of digital, analog, and complex terminal diagnostic data.\u003c\/li\u003e\n  \u003cli\u003eClear status indication via diagnostics LEDs for K-bus status, Interbus traffic, and power supply.\u003c\/li\u003e\n  \u003cli\u003eConfigurable using the KS2000 configuration software.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eInterbus-based distributed industrial control environments.\u003c\/li\u003e\n  \u003cli\u003eModular and scalable field I\/O systems in plant automation.\u003c\/li\u003e\n  \u003cli\u003eMachine control architectures utilizing modular digital and analog signals.\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  \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\u003eBK4020\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003eInterbus Bus Coupler\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eCommunication and I\/O\u003c\/h4\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFieldbus System\u003c\/td\u003e\n      \u003ctd\u003eInterbus\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eData Transfer Rate\u003c\/td\u003e\n      \u003ctd\u003e500 kbaud\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBus Interface\u003c\/td\u003e\n      \u003ctd\u003e2 x D-sub, 9-pin (plug and socket) with screening and vibration lock\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMax. Number 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\u003eMax. Fieldbus Process Image\u003c\/td\u003e\n      \u003ctd\u003e64 bytes input, 64 bytes output\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eDigital Peripheral Signals\u003c\/td\u003e\n      \u003ctd\u003e512 inputs\/outputs\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAnalog Peripheral Signals\u003c\/td\u003e\n      \u003ctd\u003e32 inputs\/outputs\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eElectrical\u003c\/h4\u003e\n\u003ctable\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\u003eRecommended Fuse\u003c\/td\u003e\n      \u003ctd\u003eLess than or equal to 10 A\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eK-bus Current Supply\u003c\/td\u003e\n      \u003ctd\u003e1750 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePower Contacts\u003c\/td\u003e\n      \u003ctd\u003eMax. 24 V DC \/ Max. 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 \/ fieldbus)\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eMechanical and Environmental\u003c\/h4\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eWeight\u003c\/td\u003e\n      \u003ctd\u003eApprox. 170 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\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    \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  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eConnections \/ Interfaces\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eInterface or Terminal\u003c\/th\u003e\n      \u003cth\u003eFunction\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInterbus Input (9-pin D-sub Plug)\u003c\/td\u003e\n      \u003ctd\u003eIncoming Interbus line connection\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInterbus Output (9-pin D-sub Socket)\u003c\/td\u003e\n      \u003ctd\u003eOutgoing Interbus line connection to next node\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePower Feed-in Terminals\u003c\/td\u003e\n      \u003ctd\u003e24 V DC connection for electronics and K-bus\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePower Contacts\u003c\/td\u003e\n      \u003ctd\u003eAutomatic distribution of 24 V DC field power to adjacent terminals\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 supplies to the system are completely de-energized before mounting, wiring, or removing any components.\u003c\/li\u003e\n  \u003cli\u003eMount the \u003cstrong\u003eBECKHOFF BK4020\u003c\/strong\u003e on a standard 35 mm DIN rail (EN 60715) inside a dry, dust-free control cabinet with at least an IP20 protection rating.\u003c\/li\u003e\n  \u003cli\u003eSecurely slide the coupler onto the DIN rail, verifying that the lock mechanism clicks into place.\u003c\/li\u003e\n  \u003cli\u003eAlign and slide the required Bus Terminals onto the right-hand side of the coupler. Ensure the tongue-and-groove system and physical contacts align smoothly.\u003c\/li\u003e\n  \u003cli\u003eConnect the incoming Interbus cable to the 9-pin D-sub plug and the outgoing link to the 9-pin D-sub socket, securing the physical vibration locks.\u003c\/li\u003e\n  \u003cli\u003eConnect a 24 V DC power source to the designated terminal points on the coupler to supply the internal logic, K-bus, and field-side power contacts.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106532122987,"sku":"BK4020","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bk4020-dyg4a5e4kgj.png?v=1776243461","url":"https:\/\/www.plcprotech.com\/products\/beckhoff-bk4020-interbus-bus-coupler","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}