{"product_id":"esb-bus-coupler-modules-sec402-51-yokogawa","title":"ESB Bus Coupler Modules | SEC402-51 | Yokogawa","description":"\u003ch2\u003eYokogawa SEC402-51 ESB Bus Coupler Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for ESB bus data exchange between safety control units and safety node units in ProSafe-RS safety system architectures, the \u003cstrong\u003eYokogawa SEC402-51\u003c\/strong\u003e (\u003cstrong\u003eSEC402\u003c\/strong\u003e ESB Bus Coupler Module) provides direct physical backplane-to-field node communication via dual ESB bus interfaces mounted on dedicated controller slots.\u003c\/p\u003e\n\u003cp\u003eThe module operates as a dual-port ESB bus master interface, managing cyclic I\/O data transmission between safety control unit S2SC70£ \/ SSC60£ and distributed safety node units through upper and lower ESB trunk segments.\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModelBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa SEC402-51\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 0.24 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePowerConsumption\u003c\/td\u003e\n\u003ctd\u003e0.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Function\u003c\/td\u003e\n\u003ctd\u003eESB Bus Coupler \/ ESB bus master interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Speed\u003c\/td\u003e\n\u003ctd\u003e128 Mbps (I\/O data transmission)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Node Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 9 units per upper\/lower side (standard), up to 12 with star connection (R4.04 or later)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Distance\u003c\/td\u003e\n\u003ctd\u003eMax 10 m per ESB bus segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Position\u003c\/td\u003e\n\u003ctd\u003eSlots 7 and 8 of safety control unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eESB Bus Architecture Characteristics (Yokogawa Safety Network Layer)\u003c\/h3\u003e\n\u003cp\u003eYokogawa ESB bus architecture implements deterministic cyclic data transfer between safety controller backplane and distributed node I\/O units using dual-channel ESB segmentation (upper\/lower bus paths). The SEC402-51 functions as the physical bus master, scheduling frame-level synchronization and enforcing node scan consistency across safety I\/O modules such as SNB10D and SNT4££ series.\u003c\/p\u003e\n\u003cp\u003eThe ESB communication layer is engineered for fixed-cycle deterministic exchange, with separation of upper and lower bus domains to reduce cross-segment traffic coupling. In star topology mode (S2SC70S \/ S2SC70D with R4.04+), node expansion logic extends to 12 units per segment, requiring strict adherence to ESB cable length constraints and termination impedance matching across distributed node branches.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the SEC402-51 operate in hot-swap conditions?\u003cbr\u003eA: Module replacement is not intended under energized ESB bus conditions. Bus synchronization requires controller-level reinitialization after physical replacement.\u003c\/p\u003e\n\u003cp\u003eQ: What limits ESB bus node expansion per segment?\u003cbr\u003eA: Node count is constrained by ESB master scan cycle timing and electrical loading. Standard configuration supports 9 nodes per side; extended star topology supports up to 12 nodes with firmware R4.04 or later.\u003c\/p\u003e\n\u003cp\u003eQ: Does the module isolate upper and lower ESB bus domains?\u003cbr\u003eA: Upper and lower ESB ports operate as logically separated bus channels, but share synchronized scan timing under a single ESB master scheduling mechanism.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eESB Bus Coupler Modules shall be installed only in slot positions 7 and 8 of the designated safety control unit chassis. Ensure correct alignment of ESB backplane connectors prior to insertion to avoid signal misalignment on high-speed bus lanes.\u003c\/p\u003e\n\u003cp\u003eESB cable routing must maintain separation between upper and lower bus segments. Cable length must not exceed 10 m per segment. Shield termination shall be grounded at one end only to prevent ground loop current injection into the bus reference plane.\u003c\/p\u003e\n\u003cp\u003eAvoid mechanical stress on ESB connectors during installation. Ensure all node units are powered down or placed in maintenance mode before coupling or decoupling ESB trunk lines.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44147174178904,"sku":"SEC402-51","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/SEC402-51-3.jpg?v=1779853371","url":"https:\/\/www.industriaxplc.com\/products\/esb-bus-coupler-modules-sec402-51-yokogawa","provider":"IndustriaX Limited","version":"1.0","type":"link"}