{"product_id":"snb10d-225-cu2n-yokogawa-prosafe-rs-safety-node-unit","title":"SNB10D-225\/CU2N Yokogawa ProSafe-RS Safety Node Unit","description":"\u003ch2\u003eYokogawa SNB10D-225\/CU2N Safety Node Unit\u003c\/h2\u003e\n\u003cp\u003eConfigured for distributed safety I\/O expansion in ProSafe-RS safety instrumented systems, the \u003cstrong\u003eYokogawa SNB10D-225\/CU2N\u003c\/strong\u003e (\u003cstrong\u003eSNB10D\u003c\/strong\u003e Safety Node Unit) provides direct physical\/electrical execution. This rack-mounted chassis houses up to 8 safety I\/O modules, establishing dual-redundant electrical ESB bus interconnections to primary Safety Control Units (SCUs). By enforcing hardware-level signal isolation and executing duplex communication link protocols across local node networks, the assembly guarantees deterministic safety trip signal propagation without compromising network integrity.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eCode Section\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eValue\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDesignator Description\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Model\u003c\/td\u003e\n\u003ctd\u003eSNB10D\u003c\/td\u003e\n\u003ctd\u003eSafety Node Unit Chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuffix Code 1\u003c\/td\u003e\n\u003ctd\u003e-2\u003c\/td\u003e\n\u003ctd\u003eDual-redundant power supply with software license for node expansion (R3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuffix Code 2\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e220 to 240 V AC power supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuffix Code 3\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003eISA Standard G3 compliant, -20 to 70 deg C storage rating, non-explosion protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOption Code\u003c\/td\u003e\n\u003ctd\u003e\/CU2N\u003c\/td\u003e\n\u003ctd\u003eConnector Unit for ESB Bus (Part Number: S9342FA), non-terminator variant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003eSNB10D-225\/CU2N\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\u003eRole \/ Type\u003c\/td\u003e\n\u003ctd\u003eSafety Node Unit (SNU)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eProSafe-RS Safety Instrumented Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 8 safety I\/O modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e220 to 240 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.5 A to 2.0 A (load dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Architecture\u003c\/td\u003e\n\u003ctd\u003eDual-redundant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eDual ESB bus (electrical, duplex)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Bus Distance\u003c\/td\u003e\n\u003ctd\u003e100 m per electrical ESB segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Topology\u003c\/td\u003e\n\u003ctd\u003eStar or Bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Connector Unit\u003c\/td\u003e\n\u003ctd\u003eS9342FA (CU2N, non-terminator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eGalvanic isolation between ESB bus and backplane logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W x H x D)\u003c\/td\u003e\n\u003ctd\u003e482.6 mm x 132.5 mm x 177.0 mm (Enclosure: 48.2 cm x 22.1 cm x 20.5 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e5.9 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e8.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C (special derating\/mounting rules apply up to 70 deg C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-20 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironmental Standard\u003c\/td\u003e\n\u003ctd\u003eISA Standard G3 conformal coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety \u0026amp; Compliance\u003c\/td\u003e\n\u003ctd\u003eIEC 61508 SIL3, CE, UL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSIL3 Certified Dual-Redundant ESB Bus Interfacing\u003c\/h3\u003e\n\u003cp\u003eThe SNB10D-225\/CU2N chassis incorporates high-integrity channel-to-channel and bus-to-logic galvanic isolation to prevent ground loops and high-voltage surge propagation from degrading system logic. Engineered to meet IEC 61508 SIL3 certification standards, the integrated backplane routes analog and digital safety loops while maintaining cold junction compensation (CJC) path accuracy for critical temperature elements. The dual-redundant ESB bus interface facilitates continuous channel-level diagnostic scanning and seamless master-slave fail-safe switching. When coupled with the CU2N connector unit, the rack buffers process signal lines directly against electrical fast transients, ensuring uninterrupted execution of emergency shutdown (ESD) matrix routines.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What distinguishes the \/CU2N connector option from the \/CU2T option on the SNB10D chassis?\u003c\/p\u003e\n\u003cp\u003eA: The \/CU2N option installs the S9342FA non-terminator connector unit, which passes the dual ESB bus signals through to downstream safety node units in a daisy-chain or bus topology. The \/CU2T option contains built-in bus terminating resistors and must be deployed exclusively at the final physical node on an electrical ESB bus segment.\u003c\/p\u003e\n\u003cp\u003eQ: How does the dual-redundant power supply operate if one AC feed drops?\u003c\/p\u003e\n\u003cp\u003eA: The dual 220 to 240 V AC power modules feed an internal diode-ORed DC bus on the backplane. If one primary AC power supply line drops voltage or fails internally, the secondary module instantly sustains the full 1.5 A to 2.0 A load without interrupting module logic states or triggering false SIL3 safety trips.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the unit directly into a standard 19-inch rack enclosure using all four front-flange mounting screws. Maintain a minimum vertical clearance of 50 mm above and below the chassis frame to ensure natural convection cooling across the internal power supply heat sinks. Verify that the AC input line is fused according to Yokogawa distribution guidelines before applying 220 to 240 V AC power.\u003c\/p\u003e\n\u003cp\u003eWhen wiring the dual electrical ESB bus connectors via the CU2N unit, route the channel A and channel B coaxial cables through independent wireways to prevent simultaneous physical damage. Clamp all cable shields directly to the cabinet functional ground bar using low-impedance grounding straps. Ensure that the total electrical ESB segment length does not exceed 100 m. If the physical distance to the Safety Control Unit exceeds 100 m, connect an optical master module (SNT401) to transition the signal path onto fiber-optic media.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43895563354202,"sku":"SNB10D-225\/CU2N","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/456._c2fce33a-12e7-453e-878a-74b0aa8bb21d.jpg?v=1787543955","url":"https:\/\/www.spareoil.com\/products\/snb10d-225-cu2n-yokogawa-prosafe-rs-safety-node-unit","provider":"SpareOil Automation","version":"1.0","type":"link"}