{"product_id":"yokogawa-sec402-51-coupler-module","title":"YOKOGAWA SEC402-51 Coupler Module","description":"\u003cp\u003eConfigured for high-speed deterministic bus signal coupling in CENTUM VP control station nodes, the \u003cstrong\u003eYokogawa SEC402-51\u003c\/strong\u003e (\u003cstrong\u003eSEC402\u003c\/strong\u003e ESB Bus Coupler Module) provides direct physical\/electrical execution. It establishes the primary communication interface between the main processor unit and remote ESB bus node interface units, driving high-frequency differential signals across dedicated backplane topologies without introducing packet transmission jitter or protocol parsing overhead.\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\u003eSEC402-51\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\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\u003e0.85 kg (Shipping Weight: 2.00 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e130 mm x 30 mm x 125 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 50 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e5.0 VDC @ 0.9 A (4.5 W nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eESB Bus Coupler Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Transmission Speed\u003c\/td\u003e\n\u003ctd\u003e128 Mbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Transmission Distance\u003c\/td\u003e\n\u003ctd\u003e10 m (via dedicated ESB bus cable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Support\u003c\/td\u003e\n\u003ctd\u003eDual-redundant configuration supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Isolation\u003c\/td\u003e\n\u003ctd\u003eGalvanic isolation via bus pulse transformers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eCold Junction Compensation and Channel-to-Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe SEC402-51 operates within Yokogawa CENTUM architectures where analog signal integrity relies on strict channel-to-channel isolation and accurate cold junction compensation (CJC) executed at downstream I\/O nodes. To prevent ground loops from corrupting 4-20 mA HART loop protocol paths and millivolt-level thermocouple inputs, the module utilizes high-density transformer isolation across its internal ESB bus transceiver circuitry. This design isolates backplane logic power from field-side noise propagation. When interfacing with remote thermal input modules, the high-speed 128 Mbps ESB bus payload maintains microsecond-level synchronization to transmit digitized CJC reference voltages across the rack backplane, ensuring zero phase shift during real-time Process Variable (PV) processing.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the SEC402-51 support online replacement (hot-swapping) while the control node is powered?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The module is designed for hot-swap installation in dual-redundant ESB bus configurations. When replacing a faulty SEC402-51, the standby coupler automatically maintains active communication link state without causing node reset or interrupting backplane traffic.\u003c\/p\u003e\n\u003cp\u003eQ: What are the physical cabling constraints for connecting the SEC402-51 to remote I\/O nodes?\u003c\/p\u003e\n\u003cp\u003eA: The SEC402-51 must connect using dedicated Yokogawa YCB301 ESB bus cables. Total cable length per bus segment must not exceed 10 m to preserve 128 Mbps signal integrity and prevent impedance mismatch reflections.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003ePower off the target slot or verify that the redundant bus coupler is fully active prior to inserting or removing the SEC402-51 module.\u003c\/li\u003e\n\u003cli\u003eAlign the module circuit board with the upper and lower guide rails of the dedicated CENTUM CPU node chassis slot.\u003c\/li\u003e\n\u003cli\u003ePush the module firmly into the slot until the backplane multi-pin connector seats completely. Tighten the top and bottom retaining screws to 0.5 Nm to secure mechanical grounding.\u003c\/li\u003e\n\u003cli\u003eConnect the YCB301 ESB bus cable to the front-panel connector. Ensure the cable locking mechanism snaps completely into place to prevent accidental vibration disconnects.\u003c\/li\u003e\n\u003cli\u003eVerify ground continuity by connecting the cable shield drainage wire directly to the cabinet functional earth (FE) bus bar with a minimum conductor gauge of 2.0 mm2.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52702759190808,"sku":"SEC402-51","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/SDV144-S332_Cocoai_1c3f82cd-67fd-49f8-b4ea-96e0d64aa310.jpg?v=1789718589","url":"https:\/\/www.innoplcsync.com\/products\/yokogawa-sec402-51-coupler-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}