{"product_id":"beckhoff-bc7300-modbus-bus-terminal-controller","title":"Beckhoff BC7300 Modbus Bus Terminal Controller","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eExecuting local control logic while maintaining high-speed fieldbus communications, the \u003cstrong\u003eBECKHOFF BC7300\u003c\/strong\u003e serves as a decentralized programmable controller that seamlessly bridges serial Modbus networks and modular I\/O terminals. This compact controller integrates a complete PLC runtime system conforming to \u003cstrong\u003eIEC 61131-3\u003c\/strong\u003e, allowing local preprocessing of signals independent of the master control system. Capable of hosting up to \u003cstrong\u003e64 Bus Terminals\u003c\/strong\u003e, the device optimizes distributed topologies by managing up to 256 digital or 128 analog inputs and outputs directly on the K-bus assembly.\u003c\/p\u003e\n\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe integrated \u003cstrong\u003eRS485 D-sub interface\u003c\/strong\u003e supports both Modbus RTU and ASCII protocols, facilitating straightforward integration into legacy SCADA, DCS, or third-party PLC architectures. Configured using \u003cstrong\u003eTwinCAT\u003c\/strong\u003e programming environments, the device features robust electrical isolation and a dedicated internal power supply to drive connected terminal modules reliably under harsh industrial conditions.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1rem; padding-left: 20px;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocal Intelligence:\u003c\/strong\u003e Built-in PLC runtime system executes 1 PLC task with a cycle time of approximately 3 ms per 1,000 instructions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Address Configuration:\u003c\/strong\u003e Address settings and operating modes can be adjusted directly via integrated rotary switches or KS2000 software.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh I\/O Capacity:\u003c\/strong\u003e Supports direct connection of up to 64 Beckhoff Bus Terminals (K-bus expansion).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Protocol Support:\u003c\/strong\u003e Configurable for either Modbus RTU or Modbus ASCII serial communication protocols.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstantial Local Memory:\u003c\/strong\u003e Equipped with 32\/96 KB of program memory and 32\/64 KB of data memory, alongside 512 bytes of remanent data storage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustrial Protection:\u003c\/strong\u003e Features 500 V electrical isolation between the power contacts, supply voltage, and the fieldbus interface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1rem; padding-left: 20px;\"\u003e\n  \u003cli\u003eDecentralized manufacturing automation lines requiring local preprocessing.\u003c\/li\u003e\n  \u003cli\u003eRemote Terminal Unit (RTU) deployments in infrastructure, water, and wastewater systems.\u003c\/li\u003e\n  \u003cli\u003eHVAC and building automation networks utilizing serial Modbus RTU protocols.\u003c\/li\u003e\n  \u003cli\u003eSubstation monitor systems requiring localized signal conditioning and processing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #e2e8f0; text-align: left;\"\u003e\n        \u003cth style=\"padding: 12px; font-weight: bold; color: #1a365d;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"padding: 12px; font-weight: bold; color: #1a365d;\"\u003eSpecification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eBeckhoff Automation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eBC7300\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eFieldbus Interface\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eD-sub 9-pin, RS485\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eSupported Protocols\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eModbus RTU, Modbus ASCII (Default: RTU)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eData Transfer Rates\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 baud\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eProgramming Software\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eTwinCAT (via programming interface or fieldbus)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eProgram Memory\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e32 \/ 96 kbytes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eData Memory\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e32 \/ 64 kbytes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eRemanent Data\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e512 bytes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eK-Bus Current Supply\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e1750 mA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePower Contacts\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eMax. 24 V DC \/ Max. 10 A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e0 to +55 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eStorage Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e-25 to +85 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eATEX Ex Marking\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eII 3 G Ex nA IIC T4 Gc\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePhysical Dimensions\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e51 mm x 100 mm x 69 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eProduct Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e170 g\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e3.0 kg (with heavy-duty industrial protective packaging)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #e2e8f0; text-align: left;\"\u003e\n        \u003cth style=\"padding: 12px; font-weight: bold; color: #1a365d;\"\u003eD-sub 9-Pin Pinout\u003c\/th\u003e\n        \u003cth style=\"padding: 12px; font-weight: bold; color: #1a365d;\"\u003eSignal Designation\u003c\/th\u003e\n        \u003cth style=\"padding: 12px; font-weight: bold; color: #1a365d;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePin 3\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eRxD\/TxD-B (+)\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eTransmit \/ Receive Data (Positive)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePin 8\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eRxD\/TxD-A (-)\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eTransmit \/ Receive Data (Negative)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePin 5\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eGND\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eSignal Ground Reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePin 1\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eShield\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eFunctional Earth \/ Shield Connection\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\n\u003ch3\u003eAlternative Models \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWhile the \u003cstrong\u003eBC7300\u003c\/strong\u003e targets serial Modbus RTU\/ASCII applications, systems transitioning to Ethernet infrastructures should consider the \u003cstrong\u003eBC9000\u003c\/strong\u003e (Modbus\/TCP). When upgrading legacy setups, ensure that the TwinCAT target system configuration matches the target BC architecture, as compiling for BK-type couplers is incompatible with BC programmable controllers.\u003c\/p\u003e\n\n\u003ch3\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe BC7300 features a maximum K-Bus current supply capacity of \u003cstrong\u003e1750 mA\u003c\/strong\u003e. When configuring a dense physical node with multiple analog or special function terminals, calculate the cumulative current consumption of all modules. If the requirements exceed 1750 mA, you must integrate intermediate power feed terminals (such as the KL9110 or KL9210) to prevent dropouts on the internal bus.\u003c\/p\u003e\n\n\u003ch3\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eAlways verify that the termination resistor on the Modbus RS485 physical line is correctly switched or wired. Because the BC7300 reads rotary switch station addresses only during its initial boot phase, any physical modifications made to the node address while powered will not take effect until the device undergoes a complete power cycle.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 15px; margin-bottom: 1.5rem;\"\u003e\n  \u003cstrong style=\"color: #9b2c2c; display: block; margin-bottom: 5px;\"\u003eCRITICAL SAFETY WARNING\u003c\/strong\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0;\"\u003eIsolate all electrical power sources before initiating hardware installation, wire termination, or terminal block removal. Failure to de-energize primary supply circuits and physical contacts can result in permanent equipment damage, short circuits, or electrical shock hazards to commissioning engineers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 12px; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; margin-right: 12px; font-weight: bold; font-size: 14px;\"\u003e1\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 2px;\"\u003eMount the BC7300 controller firmly onto a standard 35 mm DIN rail (conforming to EN 60715) until the rear locking mechanism fully engages.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; margin-right: 12px; font-weight: bold; font-size: 14px;\"\u003e2\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 2px;\"\u003eSlide adjacent Beckhoff Bus Terminals onto the rail from right to left, utilizing the integrated double slot and key connection for reliable structural alignment.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; margin-right: 12px; font-weight: bold; font-size: 14px;\"\u003e3\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 2px;\"\u003eTerminate field wiring into the cage clamp terminals using a flat-head screwdriver to actuate the spring tension mechanism. Strip conductors strictly to 8–9 mm.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px; border-radius: 50%; background-color: #2b6cb0; color: #ffffff; margin-right: 12px; font-weight: bold; font-size: 14px;\"\u003e4\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748; padding-top: 2px;\"\u003eConnect the RS485 Modbus serial line via the D-sub 9-pin interface. Ensure that proper shielding is maintained and grounded at a single, centralized earth point.\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106472747371,"sku":"BC7300","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bc7300-52ojlm1vc11.png?v=1776243422","url":"https:\/\/www.plcprotech.com\/tr\/products\/beckhoff-bc7300-modbus-bus-terminal-controller","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}