{"product_id":"abb-tb840a-3bse037760r1-modulebus-cluster-modem","title":"ABB TB840A 3BSE037760R1 Modulebus Cluster Modem","description":"\u003cp\u003eThe \u003cstrong\u003eABB TB840A 3BSE037760R1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eTB840A\u003c\/strong\u003e Modulebus Cluster Modem, operates as a dedicated hardware component for optical-to-electrical signal conversion and I\/O bus expansion within System 800xA and S800 I\/O platforms. The module interfaces two optical ModuleBus fiber ports directly with electrical ModuleBus I\/O backplane lines, managing supervisory power and redundant bus topology execution. It incorporates galvanic power isolation to protect downstream I\/O clusters from line-side electrical transients.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eTB840A 3BSE037760R1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg (0.44 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e54 mm x 119 mm x 96 mm (2.13 in x 4.69 in x 3.78 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e120 mA at 24 VDC (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocol\u003c\/td\u003e\n\u003ctd\u003eModulebus (Optical and Electrical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Mode\u003c\/td\u003e\n\u003ctd\u003eSlave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLine Redundancy\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Redundancy\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHot Swap\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHI Controller Compatibility\u003c\/td\u003e\n\u003ctd\u003eYes (Used with High Integrity Controllers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible MTUs\u003c\/td\u003e\n\u003ctd\u003eTU840 (Redundant TB840A, Dual ModuleBus), TU841 (Redundant TB840A, Single ModuleBus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and Deterministic Network Redundancy\u003c\/h3\u003e\n\u003cp\u003eThe TB840A modem maintains deterministic signal propagation across optical and electrical ModuleBus segments, enabling high-density I\/O expansion without introducing communication delays. Firmware flash compatibility ensures smooth integration across S800 I\/O clusters and High Integrity (HI) safety controllers. When deployed on dual ModuleBus terminal units (TU840\/TU841), the module continuously monitors link integrity and optical power levels, executing seamless bumpless failover between primary and secondary lines if signal degradation occurs.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the TB840A support hot-swapping under live operating conditions?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The TB840A allows live replacement on a powered ModuleBus terminal unit (such as TU840 or TU841) without disrupting communication on adjacent active modules.\u003c\/p\u003e\n\u003cp\u003eQ: What power input protection features are built into the TB840A modem?\u003c\/p\u003e\n\u003cp\u003eA: The module contains internal power input fuses along with isolated power supply circuitry that delivers regulated, surge-protected DC power to connected I\/O module backplanes.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the matching ModuleBus Terminal Unit (TU840 for dual ModuleBus or TU841 for single ModuleBus) onto the DIN rail before module insertion.\u003c\/li\u003e\n\u003cli\u003eEnsure optical fiber connectors (ST type) are clean and free of dust contamination before inserting into the optical ModuleBus ports.\u003c\/li\u003e\n\u003cli\u003eObserve ESD precautions by wearing an earth-grounded wrist strap prior to unboxing and inserting the unit into its terminal unit slot.\u003c\/li\u003e\n\u003cli\u003ePush the TB840A firmly into the MTU slot until the mechanical locking latch fully engages the base assembly.\u003c\/li\u003e\n\u003cli\u003eConnect external 24 VDC power through fused terminal blocks and verify that field cabling shields terminate at a single chassis ground lug.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":53224171569461,"sku":"TB840A 3BSE037760R1","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/TB840A.png?v=1785297202","url":"https:\/\/www.5gplc.com\/products\/abb-tb840a-3bse037760r1-modulebus-cluster-modem","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}