{"product_id":"ssc50d-s2121-yokogawa-prosafe-rs-duplexed-safety-control-unit","title":"SSC50D-S2121 Yokogawa ProSafe-RS Duplexed Safety Control Unit","description":"\u003ch2\u003eYokogawa SSC50D-S2121 ProSafe-RS Safety Control Unit\u003c\/h2\u003e\n\u003cp\u003eConfigured for high-availability dual-redundant processing in ProSafe-RS Safety Instrumented Systems, the \u003cstrong\u003eYokogawa SSC50D-S2121\u003c\/strong\u003e (\u003cstrong\u003eSSC50D\u003c\/strong\u003e Duplexed Safety Control Unit) provides direct physical\/electrical execution.\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\u003eModel \/ Suffix Code\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\u003e\u003cstrong\u003eSSC50D\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuplexed Safety Control Unit (Rack Mountable Type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e-S\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard type processor module execution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDual-redundant power supply module capability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle ESB bus interface module configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eISA Standard G3 conformal coating for harsh environment protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard specification for system expansion\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\u003eSSC50D-S2121\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\u003e6 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 19-inch rack chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-10 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eDual 24 VDC internal bus distribution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e50 digital inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC +\/-10%, 12 VDC +\/-10%, 5 VDC +\/-10%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Current\u003c\/td\u003e\n\u003ctd\u003e10 mA max per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e3 k-ohm minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Rating\u003c\/td\u003e\n\u003ctd\u003e500 Vrms (input to ground)\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 Isolation\u003c\/h3\u003e\n\u003cp\u003eThe Yokogawa SSC50D-S2121 processes sensor data and safety logic execution across isolated 4-20 mA HART loop channels and discrete field inputs. Internal 500 Vrms isolation networks separate the main processor backplane from external ground loops and voltage spikes. Integrated safety communication controllers handle real-time diagnostics over the ESB bus, allowing dual-redundant processor modules to mirror state vectors continuously while maintaining galvanic separation across process variable measurement channels.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the duplex architecture maintain continuous safety logic execution during a processor fault?\u003c\/p\u003e\n\u003cp\u003eA: Dual redundant CPU modules run identical safety control applications in lockstep; if a hardware fault occurs on the primary CPU, control transfers seamlessly to the secondary CPU without dropping output signals.\u003c\/p\u003e\n\u003cp\u003eQ: What insulation isolation level exists between the field digital input channels and system ground?\u003c\/p\u003e\n\u003cp\u003eA: The digital input circuitry provides a galvanically isolated barrier rated up to 500 Vrms between the input terminals and chassis ground.\u003c\/p\u003e\n\u003cp\u003eQ: Can an auxiliary power module be replaced without de-energizing the main safety unit?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the unit supports live maintenance, allowing technicians to hot-swap a faulty power supply module while the redundant power module carries the system load.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eEngineers must follow standard industrial safety rack-mounting practices during installation:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eMount the chassis into a standard 19-inch enclosure using four M5 screws and install grounding isolation washers to prevent chassis ground loop currents.\u003c\/li\u003e\n\u003cli\u003eRoute high-voltage power lines away from low-voltage DC signals and ESB communication cables to prevent electromagnetic coupling.\u003c\/li\u003e\n\u003cli\u003eTorque all power supply and ground wire terminal connections to manufacturer specifications before energizing the 24 VDC bus feeds.\u003c\/li\u003e\n\u003cli\u003eConfirm proper seating and locking lever engagement for both duplex processor modules prior to system startup.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43901473816666,"sku":"SSC50D-F2121","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/654._31f830d1-9d3c-4853-be04-82b0877a4bc4.jpg?v=1787623595","url":"https:\/\/www.spareoil.com\/products\/ssc50d-s2121-yokogawa-prosafe-rs-duplexed-safety-control-unit","provider":"SpareOil Automation","version":"1.0","type":"link"}