{"product_id":"snt401-53-yokogawa-prosafe-rs-optical-esb-bus-repeater","title":"SNT401-53 Yokogawa ProSafe-RS Optical ESB Bus Repeater","description":"\u003ch2\u003eYokogawa SNT401-53 Optical ESB Bus Repeater Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa SNT401-53\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eSNT401\u003c\/strong\u003e Optical ESB Bus Repeater Master Module, operates as a dedicated hardware component for converting ESB bus electrical signals into optical signals within ProSafe-RS safety systems.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe suffix breakdown specifies environmental ratings and connector configurations for the SNT401 series:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSNT401\u003c\/strong\u003e: Optical ESB Bus Repeater Master Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-5\u003c\/strong\u003e: Standard type with no explosion protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\u003c\/strong\u003e: ISA Standard G3 conformal coating and extended operating temperature (-20 deg C to +70 deg C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\/CU1N\u003c\/strong\u003e: Connector unit for ESB Bus (without bus terminator)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\/CU1T\u003c\/strong\u003e: Connector unit for ESB Bus (with built-in bus terminator)\u003c\/li\u003e\n\u003c\/ul\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\u003eSNT401-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa Electric Corporation\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\u003e0.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e32.8 x 142.5 x 130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.5 A (from 5 VDC chassis backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Medium\u003c\/td\u003e\n\u003ctd\u003eOptical fiber cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Distance\u003c\/td\u003e\n\u003ctd\u003e5 km per stage (10 km maximum across dual-stage topologies)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eProSafe-RS Safety Control Units, Safety Node Units, N-IO nodes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Topology\u003c\/td\u003e\n\u003ctd\u003eStar or chain topologies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol \u0026amp; Channel-to-Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe SNT401-53 master module enables long-distance optical transport for safety instrumented functions while maintaining galvanic channel-to-channel isolation between electrical rack backplanes. By converting copper-based ESB signals to optical signals, the module isolates 4-20 mA HART loop protocol instruments and safety interlocks from high-voltage surges, ground potential shifts, and severe electromagnetic interference across distributed nodes.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the SNT401-53 module be installed in any arbitrary slot within a ProSafe-RS safety rack?\u003c\/p\u003e\n\u003cp\u003eA: No. The SNT401-53 follows specific slot pairing rules for duplex configurations. Technicians must install duplex modules in adjacent continuous odd\/even slot pairs to allow internal backplane redundancy synchronization.\u003c\/p\u003e\n\u003cp\u003eQ: What is the main structural difference between the \/CU1N and \/CU1T connector options?\u003c\/p\u003e\n\u003cp\u003eA: The \/CU1N option serves as an inline connection unit without an internal bus termination resistor, whereas the \/CU1T incorporates an integrated terminator for installation at the physical endpoint of an electrical ESB segment.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the SNT401-53 module vertically into the designated safety node rack slot, ensuring the top and bottom latch levers lock into place to establish frame ground continuity. Fasten the selected \/CU1N or \/CU1T connector unit onto the front interface using the integral retention screws. Connect clean optical LC fiber patches to the transceiver ports, ensuring cable bend radii do not fall below the manufacturer minimum threshold to avoid signal attenuation. Keep protective dust covers on all unused optical interfaces during cabinet wiring.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43895505092698,"sku":"SNT401","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/54._0d752e54-364f-4783-93b8-a862f61337eb.jpg?v=1787536284","url":"https:\/\/www.spareoil.com\/products\/snt401-53-yokogawa-prosafe-rs-optical-esb-bus-repeater","provider":"SpareOil Automation","version":"1.0","type":"link"}