
Product Description
YOKOGAWA SSC50D-S2121 S1 Duplexed Safety Control Unit - ProSafe-RS SIL 3 Certified
The YOKOGAWA SSC50D-S2121 S1 represents a breakthrough in safety instrumented system architecture, delivering fault-tolerant control for critical process safety applications. Engineered with duplexed redundancy and SIL 3 certification, this safety control unit ensures uninterrupted protection in oil & gas, chemical processing, power generation, and pharmaceutical manufacturing environments.
Technical Specifications & Core Features
- Processor Architecture: Dual MIPS R5000 processors operating in hot-standby configuration
- Memory Capacity: 32MB RAM for complex safety logic execution
- Power Supply: 100-120V AC, 50/60Hz with automatic failover
- Safety Integrity Level: SIL 3 certified per IEC 61508 / IEC 61511 standards
- Communication Protocols: Vnet/IP safety network with deterministic response times
- Diagnostic Coverage: >99% with continuous self-testing and fault detection
- Operating Temperature: -20°C to +60°C for harsh industrial environments
- MTBF: >100,000 hours ensuring long-term reliability
Industrial Applications & Use Cases
Emergency Shutdown Systems (ESD): Provides instantaneous trip logic for burner management, compressor protection, and reactor isolation sequences with <10ms response latency.
Fire & Gas Detection Integration: Coordinates multi-zone flame detection arrays and toxic gas monitoring networks, executing automated suppression protocols while maintaining operational continuity.
High-Integrity Pressure Protection (HIPPS): Prevents pipeline overpressure events through predictive valve control algorithms, eliminating costly mechanical relief valve activations.
Turbomachinery Safeguarding: Monitors vibration, temperature, and surge parameters across gas turbines and centrifugal compressors, implementing staged shutdown procedures to prevent catastrophic failures.
System Integration & Solution Architecture
The SSC50D-S2121 S1 seamlessly interfaces with YOKOGAWA's ProSafe-RS ecosystem, supporting up to 64 safety node units and 2,048 I/O points per controller pair. Native integration with CENTUM VP DCS enables unified operator interfaces while maintaining complete functional separation per IEC 61511 requirements. The unit's modular design facilitates online replacement without system shutdown, reducing maintenance windows by 75%.
Advanced Diagnostic & Predictive Maintenance
Built-in health monitoring tracks processor load, memory utilization, network latency, and power supply voltage drift. Predictive algorithms identify degradation patterns 30-90 days before failure thresholds, enabling proactive component replacement. HART-compatible diagnostics provide real-time field device status, reducing troubleshooting time by 60%.
Compliance & Safety Certifications
Certified to IEC 61508 SIL 3, IEC 61511, ANSI/ISA 84.00.01, and TÜV Rheinland standards. Meets ATEX Zone 2, CSA Class I Division 2, and IECEx hazardous area classifications. Compliant with cybersecurity standards IEC 62443-3-3 and IEC 62443-4-2 for secure industrial networks.
Related Safety System Components
| Product | Description | Link |
|---|---|---|
| Yokogawa SNB10D-445/CU2T | Safety Node Unit for distributed I/O expansion | View Product |
| Yokogawa S9185FA Battery Pack | 3.6V lithium backup power for SSC50D systems | View Product |
| Emerson KJ2201X1-PW1 | DeltaV SIS Smart Logic Solver alternative | View Product |
Why Choose SSC50D-S2121 S1?
With proven deployment in over 5,000 installations worldwide, the SSC50D-S2121 S1 delivers industry-leading safety availability of 99.99%. Its duplexed architecture eliminates single points of failure while maintaining deterministic scan times under 100ms. The unit's backward compatibility with legacy ProSafe systems protects existing infrastructure investments while enabling phased modernization strategies.
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