{"product_id":"yokogawa-ssc50d-s2121-prosafe-rs-safety-control-unit","title":"Yokogawa SSC50D-S2121 ProSafe-RS Safety Control Unit","description":"\u003ch2\u003eYokogawa SSC50D-S2121 Duplexed Safety Control Unit\u003c\/h2\u003e\n\u003cp\u003eConfigured for fault-tolerant safety logic execution in ProSafe-RS systems, the \u003cstrong\u003eYokogawa SSC50D-S2121\u003c\/strong\u003e (\u003cstrong\u003eSSC50D\u003c\/strong\u003e Duplexed Safety Control Unit) provides direct physical\/electrical execution. This rack-mountable unit houses redundant MIPS R5000 processors running parallel diagnostics to process discrete and analog safety loop signals across dual-redundant Vnet\/IP networks and ESB bus interfaces.\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\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\u003eSSC50D\u003c\/td\u003e\n\u003ctd\u003eDuplexed Safety Control Unit Base Model\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-S\u003c\/td\u003e\n\u003ctd\u003eStandard Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eDual-redundant Power Supply Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e100-120 VAC \/ 220-240 VAC or 24 VDC Power Supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eDual-redundant Vnet\/IP Interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eStandard Configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eS1\u003c\/td\u003e\n\u003ctd\u003eStyle 1\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 S1\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\u003e15 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e482.6 x 266 x 88.1 mm\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\u003e230 VA (100-240 VAC) or 5.5 A (24 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Certification\u003c\/td\u003e\n\u003ctd\u003eSIL3 compliant (IEC 61508 \/ IEC 61511)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Processing Unit\u003c\/td\u003e\n\u003ctd\u003eMIPS R5000 Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain System Memory\u003c\/td\u003e\n\u003ctd\u003e32 MB with non-volatile RAM (NVRAM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Bus Interface\u003c\/td\u003e\n\u003ctd\u003eDual-redundant ESB bus (supports up to 9 Safety Node Units)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Communications\u003c\/td\u003e\n\u003ctd\u003eDual-redundant Vnet\/IP (100 Mbps full duplex via RJ45)\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\u003eSIL3 Safety \u0026amp; Triple Modular Redundancy (TMR) \/ Pair \u0026amp; Spare Architecture\u003c\/h3\u003e\n\u003cp\u003eThe safety control unit utilizes dual parallel CPUs operating in a pair-and-spare configuration to achieve SIL3 safety integrity. Internal hardware logic performs cross-checking of processor calculations at every clock cycle. Upon detecting a internal math mismatch or memory parity failure, the onboard diagnostic supervisor isolates the faulty channel while the redundant CPU maintains uninterrupted logic solver functions. Galvanic isolation up to 500 Vrms shields the internal system bus from field loop voltage surges and ground noise.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the duplex CPU configuration handle hardware fault isolation without triggering a false trip?\u003c\/p\u003e\n\u003cp\u003eA: The redundant processors execute continuous hardware comparison diagnostics. If one processor fails a self-check or watchdog test, it automatically trips off-line, allowing the healthy processor to maintain safety loop control without interrupting plant operations.\u003c\/p\u003e\n\u003cp\u003eQ: Can maintenance technicians replace power supply modules or I\/O modules while the unit remains powered?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the unit supports full online hot-swapping for redundant power supply modules and attached I\/O cards, provided the redundant partner module remains healthy during the replacement procedure.\u003c\/p\u003e\n\u003cp\u003eQ: What action should operators take regarding memory retention power?\u003c\/p\u003e\n\u003cp\u003eA: The onboard NVRAM utilizes a lithium battery (Part Number S9185FA) to retain operational data and error logs during full power outages; replace this battery every 3 years during scheduled shutdown windows.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the control unit horizontally into a standard 19-inch instrument rack frame using four M5 retaining screws tightened to 2.5 Nm.\u003c\/li\u003e\n\u003cli\u003eVerify that ambient enclosure temperatures remain within -10 to +55 deg C and maintain 100 mm of clearance above and below the rack for proper natural convection.\u003c\/li\u003e\n\u003cli\u003eConnect both primary and secondary Vnet\/IP industrial Ethernet cables using Cat5e shielded twisted-pair cables terminated with grounded RJ45 connectors.\u003c\/li\u003e\n\u003cli\u003eConnect dual independent 24 VDC or 100-240 VAC power feeds to the redundant input terminals to ensure total power path segregation.\u003c\/li\u003e\n\u003cli\u003eBond the chassis ground lug directly to the main plant safety grounding bar using a low-impedance copper conductor with a minimum cross-sectional area of 5.5 mm2.\u003c\/li\u003e\n\u003cli\u003eRoute ESB extension bus cables through dedicated cable trays, keeping signal lines separate from high-voltage motor control cables.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43913656565850,"sku":"SSC50D-S2121","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/428_2c717bc7-e435-4959-9182-ea745df96f60.jpg?v=1787715357","url":"https:\/\/www.spareoil.com\/products\/yokogawa-ssc50d-s2121-prosafe-rs-safety-control-unit","provider":"SpareOil Automation","version":"1.0","type":"link"}