The Yokogawa SSC50D-S2111 Duplexed Safety Control Unit is an advanced safety controller designed for high-reliability applications in industrial automation and process safety systems. Built with duplexed (redundant) architecture, it ensures continuous and fail-safe operation, even under fault conditions. This unit plays a critical role in Safety Instrumented Systems (SIS), meeting stringent international safety standards for industries such as oil & gas, petrochemical, power generation, and chemical processing.

The SSC50D-S2111 integrates with Yokogawa’s ProSafe-RS safety control platform and provides superior diagnostic capabilities, high processing performance, and a modular structure for flexible expansion.

Technical Specifications

Product Applications

• Safety Instrumented Systems (SIS): Ensures safe shutdown and emergency control in refineries, chemical plants, and offshore platforms.

• Emergency Shutdown (ESD): Provides fast and reliable trip functionality during hazardous conditions.

• Fire & Gas Systems: Supports integration with flame, smoke, and gas detection systems for safe operation.

• Turbomachinery Safety: Used for critical rotating machinery protection in power plants and oil & gas facilities.

• Process Interlock Systems: Guarantees interlock logic enforcement to prevent unsafe process conditions.

• High-Reliability Control: Suitable for applications requiring high availability and minimal downtime.

Product Advantages

• Duplex Redundancy: Provides fault tolerance with automatic switchover for uninterrupted operation.

• SIL3 Certified: Complies with IEC safety standards, making it suitable for high-integrity safety applications.

• High Reliability: Online diagnostics and error detection ensure system integrity.

• Seamless Integration: Works natively with Yokogawa’s CENTUM VP and ProSafe-RS systems.

• Scalable Architecture: Supports expansion with additional safety I/O modules.

• Reduced Downtime: Hot-swap capability and redundant modules minimize operational interruptions.

• Proven Field Experience: Widely adopted in global industries with strong reliability record.

FAQ

Q1: What safety standard certifications does the SSC50D-S2111 comply with?

A1: It is certified to IEC 61508 SIL3 and complies with IEC 61511 for process safety applications.

Q2: How does the duplexed architecture enhance system reliability?

A2: Duplexed architecture provides two redundant CPUs that run in parallel, ensuring that if one fails, the other continues operation without process interruption.

Q3: Can the SSC50D-S2111 be integrated with non-Yokogawa systems?

A3: Yes, it supports standard communication protocols such as Vnet/IP and safety communication, allowing integration with third-party systems.

Q4: What diagnostic features are included in the SSC50D-S2111?

A4: It includes continuous self-diagnostics, redundancy monitoring, communication integrity checks, and fault isolation features.

Q5: Does this unit support hot-swapping of modules?

A5: Yes, it supports hot-swapping of I/O modules and redundant components, minimizing downtime during maintenance.

Q6: How does the SSC50D-S2111 ensure compliance with SIL3 requirements?

A6: It uses hardware redundancy, diverse diagnostics, and proven safety algorithms to meet SIL3 certification standards.

Q7: What communication backbone does the SSC50D-S2111 utilize?

A7: It uses Yokogawa’s Vnet/IP high-speed network for secure and reliable communication.

Q8: Can the SSC50D-S2111 handle both safety and control functions simultaneously?

A8: No, it is dedicated to safety functions and operates separately from the process control system to meet safety integrity standards.

Q9: How is redundancy handled between the duplex CPUs?

A9: Both CPUs execute the same logic in parallel, and a comparison mechanism ensures consistent operation. If a mismatch occurs, the healthy CPU continues seamlessly.

Q10: What type of I/O modules are compatible with the SSC50D-S2111?

A10: It is compatible with ProSafe-RS safety I/O modules, including digital input/output and analog input/output types.