{"product_id":"abb-tb840-3bse021456r1-modulebus-cluster-modem","title":"ABB TB840 3BSE021456R1 Modulebus Cluster Modem","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTB840 (3BSE021456R1)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis an optical Modulebus cluster modem developed by\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eABB\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor use within the S800 I\/O platform. It is engineered to support 1+1 redundant cluster architectures, enabling stable and fault-tolerant communication between distributed I\/O clusters in control and safety-critical systems.\u003c\/p\u003e\n\u003cp\u003eDesigned for high-availability environments, this communication module ensures deterministic data transfer and continuous operation even in the event of a single-path failure. The TB840 is commonly deployed in distributed control systems where optical isolation and redundancy are mandatory design requirements.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFunctional Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTB840 (3BSE021456R1)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoperates as a dedicated optical modem for Modulebus cluster interconnection. By utilizing fiber-based transmission, it provides immunity to electromagnetic interference and supports long-distance, high-speed communication between redundant cluster units.\u003c\/p\u003e\n\u003cp\u003eThe module supports seamless failover in 1+1 redundant configurations, allowing system operation to continue without interruption when one communication path becomes unavailable.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSystem Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis module is specifically designed for integration with ABB S800 I\/O systems and is fully compatible with redundant controller and I\/O cluster configurations used in modern DCS architectures.\u003c\/p\u003e\n\u003cp\u003eThe TB840 has been superseded by the TB840A, which remains electrically and mechanically compatible, ensuring straightforward replacement without system redesign.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturer: ABB\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eModel:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTB840 (3BSE021456R1)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProduct Category: Communication Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCommunication Method: Optical fiber\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRedundancy Support: 1+1 cluster operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNumber of Channels: 1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaximum Data Rate: 10,000 kbit\/s\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSupported Protocol: Modulebus (cluster communication)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInstallation Form: Plug-in module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNet Weight: 0.272 kg\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePhysical Dimensions:\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eDepth: 16 cm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHeight: 15.7 cm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWidth: 8 cm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\n\u003cp\u003eGross Volume: 2 dm³\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustoms Tariff Code: 85389091\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eReplacement and Lifecycle Information\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTB840 (3BSE021456R1)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ehas been officially replaced by the TB840A. The successor model introduces minor hardware revisions while preserving identical functionality, pin layout, and operational behavior, making it suitable for direct substitution in existing systems.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTypical Application Scenarios\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis Modulebus cluster modem is typically used in:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eRedundant S800 I\/O installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDistributed control systems with high availability requirements\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProcess automation systems in power generation, oil and gas, and chemical plants\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnvironments requiring optical isolation between I\/O clusters\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the TB840 compatible with existing S800 I\/O racks?\u003c\/strong\u003e\u003cbr\u003eYes. The module is designed specifically for the S800 I\/O platform and integrates directly into supported communication slots.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan TB840 be replaced with TB840A without configuration changes?\u003c\/strong\u003e\u003cbr\u003eYes. TB840A is pin-compatible and functionally equivalent, requiring no software or hardware modifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support electrical communication?\u003c\/strong\u003e\u003cbr\u003eNo. The TB840 uses optical fiber exclusively for cluster communication to ensure isolation and noise immunity.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":42983242137690,"sku":"TB840 3BSE021456R1","price":258.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/TB8403BSE021456R12.jpg?v=1772182764","url":"https:\/\/www.plcmasters.com\/de\/products\/abb-tb840-3bse021456r1-modulebus-cluster-modem","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}