{"product_id":"beckhoff-kl6781-bus-terminal-m-bus-master","title":"BECKHOFF KL6781 Bus Terminal M-Bus Master","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eDesigned to facilitate seamless integration of utility metering devices, the Beckhoff \u003cstrong\u003eKL6781\u003c\/strong\u003e operates as a single-channel \u003cstrong\u003eM-Bus master terminal\u003c\/strong\u003e within the standard Beckhoff Bus Terminal system. This module enables direct, bidirectional communication with up to 40 standard M-Bus loads, such as heat, water, electricity, or gas meters, over a single bus segment without requiring external level converters. Operating in master-slave mode via polling, the \u003cstrong\u003eKL6781\u003c\/strong\u003e transmits data standard M-Bus physics, enabling consolidated energy management and resource tracking directly from the TwinCAT control environment.\u003c\/p\u003e\n\n\u003cp\u003eThe terminal features a 24-byte process image for inputs and outputs, allowing robust data transfer rates ranging from 300 to 9600 baud. Integration is streamlined through the TwinCAT PLC M-Bus library, which provides specialized function blocks for rapid field configuration. With built-in short-circuit protection and 500 V electrical isolation between the K-bus and the M-Bus physics, the module ensures robust operation and system-wide protection against electrical faults in harsh industrial or commercial environments.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle-Channel Architecture:\u003c\/strong\u003e Dedicated M-Bus interface supporting up to 40 standard M-Bus loads (1.5 mA current consumption per load).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Baud Rates:\u003c\/strong\u003e Configurable data transfer rates from 300 to 9600 baud (default transmission set to 2400 baud).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical Isolation:\u003c\/strong\u003e Complete 500 V isolation barrier safeguarding the internal K-bus from the M-Bus network.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Protection:\u003c\/strong\u003e Full short-circuit proof design to prevent module failure during field wiring faults.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSoftware Compatibility:\u003c\/strong\u003e Programmed and configured directly through TwinCAT using official M-Bus PLC function blocks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCommercial and industrial building automation systems (BAS).\u003c\/li\u003e\n  \u003cli\u003eSub-metering networks for monitoring water, gas, steam, and electricity consumption.\u003c\/li\u003e\n  \u003cli\u003eEnergy management systems (EMS) compliant with ISO 5001 standards.\u003c\/li\u003e\n  \u003cli\u003eDistrict heating stations and utility billing infrastructure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003cstrong\u003eCategory\u003c\/strong\u003e\n      \u003cstrong\u003eParameter\u003c\/strong\u003e\n      \u003cstrong\u003eValue\u003c\/strong\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"3\"\u003e\u003cstrong\u003eAdministrative\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eManufacturer\u003c\/td\u003e\n      \u003ctd\u003eBeckhoff Automation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePart Number\/Model\u003c\/td\u003e\n      \u003ctd\u003eKL6781\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Series\u003c\/td\u003e\n      \u003ctd\u003eBus Terminal System (KL Series)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"6\"\u003e\u003cstrong\u003eCommunication \u0026amp; Bus\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eTechnology\u003c\/td\u003e\n      \u003ctd\u003eM-Bus\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eData Transfer Standard\u003c\/td\u003e\n      \u003ctd\u003eM-Bus physics\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNumber of Channels\u003c\/td\u003e\n      \u003ctd\u003e1\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMaximum Connected Loads\u003c\/td\u003e\n      \u003ctd\u003e40 standard loads (1.5 mA each)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eData Transfer Rates\u003c\/td\u003e\n      \u003ctd\u003e300 to 9600 baud (default: 2400 baud)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBus Access\u003c\/td\u003e\n      \u003ctd\u003eMaster-slave mode (polling)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"3\"\u003e\u003cstrong\u003eElectrical Data\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eNominal Voltage\u003c\/td\u003e\n      \u003ctd\u003e24 V DC (-10% \/ +8%)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCurrent Consumption (K-bus)\u003c\/td\u003e\n      \u003ctd\u003eTypically 65 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCurrent Consumption (Power Contacts)\u003c\/td\u003e\n      \u003ctd\u003eMaximum 250 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"3\"\u003e\u003cstrong\u003eProtection \u0026amp; Safety\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eShort-Circuit Protection\u003c\/td\u003e\n      \u003ctd\u003eYes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eElectrical Isolation\u003c\/td\u003e\n      \u003ctd\u003e500 V (K-bus \/ M-Bus)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProcess Image Bit Width\u003c\/td\u003e\n      \u003ctd\u003e24 bytes input \/ 24 bytes output\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd rowspan=\"4\"\u003e\u003cstrong\u003eEnvironmental \u0026amp; Mechanical\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eWeight\u003c\/td\u003e\n      \u003ctd\u003eApprox. 60 g\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctd\u003eOperating Temperature\u003c\/td\u003e\n    \u003ctd\u003e0 to 55 degC\u003c\/td\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 rowspan=\"3\"\u003e\u003cstrong\u003eStandards \u0026amp; Approvals\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eVibration\/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\/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\u003eCertifications \u0026amp; Marks\u003c\/td\u003e\n      \u003ctd\u003eCE, UL\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eTerminal Point\u003c\/th\u003e\n      \u003cth\u003eSignal\/Function\u003c\/th\u003e\n      \u003cth\u003eDescription\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e1\u003c\/td\u003e\n      \u003ctd\u003eM+\u003c\/td\u003e\n      \u003ctd\u003eM-Bus Connection (+)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e2\u003c\/td\u003e\n      \u003ctd\u003eShield\u003c\/td\u003e\n      \u003ctd\u003eShielding \/ Functional Ground\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e3\u003c\/td\u003e\n      \u003ctd\u003e+24 V DC\u003c\/td\u003e\n      \u003ctd\u003eExternal Power Supply (+)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e5\u003c\/td\u003e\n      \u003ctd\u003eM-\u003c\/td\u003e\n      \u003ctd\u003eM-Bus Connection (-)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e7\u003c\/td\u003e\n      \u003ctd\u003e0 V DC\u003c\/td\u003e\n      \u003ctd\u003eExternal Power Supply (0 V)\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Mount the terminal vertically on standard 35 mm DIN rails (EN 60715) within an IP20-rated enclosure or control cabinet.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Keep maximum cable lengths on the M-Bus segment below 300 meters. Use shielded twisted-pair (STP) cabling for optimal noise immunity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Connect the shield connection point directly to a low-impedance functional ground or DIN rail clamp.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVentilation:\u003c\/strong\u003e Ensure a clearance of at least 30 mm above and below the terminal block to maintain normal operating temperatures between 0 and 55 degC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106502566251,"sku":"KL6781","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/kl6781-r4ignhwstga.png?v=1776245212","url":"https:\/\/www.plcprotech.com\/fa\/products\/beckhoff-kl6781-bus-terminal-m-bus-master","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}