{"product_id":"yokogawa-ssc50d-s2521-duplexed-safety-control-unit","title":"Yokogawa SSC50D-S2521 Duplexed Safety Control Unit","description":"\u003cp\u003eConfigured for high-integrity logic execution in safety instrumented systems, the \u003cstrong\u003eYokogawa SSC50D-S2521\u003c\/strong\u003e (\u003cstrong\u003eSSC50D-S2521\u003c\/strong\u003e Duplexed Safety Control Unit) provides direct physical execution of fail-safe control logic across safety-critical process architectures.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSSC50D: Base safety controller identifier for duplexed operation.\u003c\/li\u003e\n\u003cli\u003eS2: Hardware revision level for high-availability compliance.\u003c\/li\u003e\n\u003cli\u003e5: Standard performance processing core.\u003c\/li\u003e\n\u003cli\u003e2: Safety integrity level (SIL) support class.\u003c\/li\u003e\n\u003cli\u003e1: Configuration variant for standard industrial safety I\/O mapping.\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\u003eSSC50D-S2521\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\u003e2.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard I\/O module form factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane dependent (Redundant supply)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArchitecture\u003c\/td\u003e\n\u003ctd\u003eDuplexed (1-out-of-2) fail-safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eTriple Modular Redundancy (TMR) and Fail-Safe State Execution\u003c\/h3\u003e\n\u003cp\u003eThe SSC50D-S2521 utilizes a duplexed architecture designed to maintain process safety in the event of a single point of failure. The controller executes proprietary safety logic through a fail-safe execution loop, ensuring that if internal diagnostics detect a hardware or software fault, the unit transitions to a pre-defined safe state. Galvanic isolation is implemented across all I\/O interface channels to prevent external fault propagation into the safety logic core. The duplexed pairing provides synchronized heartbeat monitoring, enabling seamless switchover if the primary controller fails to complete a processing cycle.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the SSC50D-S2521 be integrated into a non-safety standard control network?\u003c\/p\u003e\n\u003cp\u003eA: While the SSC50D-S2521 is optimized for safety instrumented systems, it can interface with standard DCS networks through defined gateway protocols. However, safety-critical signals must remain physically and logically isolated from standard process control data to comply with SIL standards.\u003c\/p\u003e\n\u003cp\u003eQ: What is the diagnostic coverage interval for the internal duplexed health check?\u003c\/p\u003e\n\u003cp\u003eA: The controller performs continuous background diagnostics on the processing core and memory modules. Any discrepancy between the duplexed units initiates a fault flag within the control system, typically within a scan cycle of less than 50 ms.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eVerify that both control units in the duplexed pair share a common synchronization bus connection to allow for state data consistency.\u003c\/li\u003e\n\u003cli\u003eEnsure the redundant power supply modules are fed from independent power circuits to maintain system availability during a power distribution fault.\u003c\/li\u003e\n\u003cli\u003eInstall the units in a controlled environment to remain within the -20 deg C to 60 deg C operating window; avoid direct heat sources near the chassis vents.\u003c\/li\u003e\n\u003cli\u003eTorque the backplane mounting screws to the manufacturer-specified value to ensure ground continuity for the internal EMI\/RFI shielding.\u003c\/li\u003e\n\u003cli\u003eAfter physical installation, perform a full loop diagnostic check from the safety engineering station to verify that I\/O addressing is consistent between the primary and secondary units.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":49219731882236,"sku":"SSC50D-S2521","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/SSC50D-F25241.jpg?v=1781143677","url":"https:\/\/www.electronicplc.com\/ar\/products\/yokogawa-ssc50d-s2521-duplexed-safety-control-unit","provider":"Electronic PLC","version":"1.0","type":"link"}