{"product_id":"sec402-21-yokogawa-esb-bus-coupler-module","title":"SEC402-21 | Yokogawa | ESB Bus Coupler Module","description":"\u003ch2\u003eYokogawa SEC402-21 ESB Bus Coupler Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa SEC402-21\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eSEC402\u003c\/strong\u003e ESB bus coupler module, serves as a dual-port master interface for connecting ProSafe-RS safety control units to distributed ESB bus I\/O node assemblies.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\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\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eSEC402-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e~0.24 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e130 mm × 129.5 mm × 32.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003eControl cabinet rated range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003e0.5 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCore Function\u003c\/th\u003e\n\u003ctd\u003eESB bus master interface for safety control units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePorts\u003c\/th\u003e\n\u003ctd\u003e2-port design (Upper\/Lower)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Nodes\u003c\/th\u003e\n\u003ctd\u003e13 total (≤9 per port, combined ≤13)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTransmission Speed\u003c\/th\u003e\n\u003ctd\u003eUp to 128 Mbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Cable Length\u003c\/th\u003e\n\u003ctd\u003e10 m per ESB bus cable segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCable Type\u003c\/th\u003e\n\u003ctd\u003eYokogawa YCB301 ESB bus cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInstallation\u003c\/th\u003e\n\u003ctd\u003ePaired installation in SSC60□ \/ S2SC70□ units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuffix Code – 2\u003c\/th\u003e\n\u003ctd\u003eStandard environment compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuffix Code – 1\u003c\/th\u003e\n\u003ctd\u003eExplosion protection \/ safety standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe SEC402-21 maintains deterministic ESB bus communication with \u003cstrong\u003echannel-to-channel isolation\u003c\/strong\u003e across redundant node connections. Dual-port architecture allows flexible distribution of up to 13 I\/O nodes, while shielding and impedance control in YCB301 cabling suppress cross-talk. Redundant installation in SSC60□ or S2SC70□ units ensures fail-safe synchronization in ProSafe-RS safety architectures.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can both ports be fully loaded with 9 nodes each? A: No, while each port supports up to 9 nodes, the combined total must not exceed 13 nodes.\u003c\/p\u003e\n\u003cp\u003eQ: What is the recommended cable for ESB bus connections? A: The SEC402-21 requires Yokogawa YCB301 ESB bus cables to maintain impedance and shielding specifications.\u003c\/p\u003e\n\u003cp\u003eQ: How is redundancy achieved in installation? A: Modules are typically installed in pairs within SSC60□ or S2SC70□ safety control units to support dual-redundant ESB bus operation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module in designated slots within SSC60□ or S2SC70□ safety control units.\u003c\/li\u003e\n\u003cli\u003eUse only Yokogawa YCB301 ESB bus cables to ensure proper impedance and shielding.\u003c\/li\u003e\n\u003cli\u003eMaintain cable length ≤10 m per port to avoid signal degradation.\u003c\/li\u003e\n\u003cli\u003eVerify connector seating and strain relief before energizing the system.\u003c\/li\u003e\n\u003cli\u003eRoute ESB bus cabling away from high-voltage conductors to minimize induced noise.\u003c\/li\u003e\n\u003cli\u003eConfirm redundant module pairing for fail-safe operation.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44105214787658,"sku":"SEC402-21","price":1800.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/8569\/3770\/files\/SCP451-11_3.png?v=1744269491","url":"https:\/\/www.topbrandsplc.com\/products\/sec402-21-yokogawa-esb-bus-coupler-module","provider":"Topbrands PLC Limited","version":"1.0","type":"link"}