Product Description

The SSC50D-S2121 S1 is a high-availability Duplexed Safety Control Unit within the Yokogawa ProSafe-RS platform.

Engineered to meet SIL3 (Safety Integrity Level 3) requirements, this unit provides a fully redundant processor architecture to ensure uninterrupted safety control even in the event of a single hardware failure.

The duplexed configuration consists of synchronized processor modules executing identical safety logic in parallel. This architecture makes the SSC50D-S2121 S1 a core component in:

• Emergency Shutdown Systems (ESD)

• Fire & Gas Systems (FGS)

• Critical interlock applications

The S2121 configuration represents a specialized hardware build optimized for seamless installation into ProSafe-RS nests. With advanced self-diagnostics and high-speed safety bus communication, the unit prioritizes fail-safe operation and maximum system uptime in hazardous industrial environments.

Technical Specifications

Application Environments

The SSC50D-S2121 S1 is widely deployed in high-risk and high-consequence industries, including:

• LNG terminals

• Offshore oil and gas platforms

• Petrochemical processing plants

• Complex chemical reactor systems

• Power generation safety systems

It manages safety-critical logic where failure could result in significant environmental damage, equipment loss, or risk to personnel.

Technical FAQ

How does the duplexed functionality improve safety?
Two processors execute identical safety logic simultaneously. Continuous cross-checking ensures that if a fault or mismatch is detected in one processor, the healthy unit maintains control without interrupting the safety loop. This architecture minimizes nuisance trips while maintaining full protective coverage.

Is the SSC50D-S2121 S1 compatible with Centum VP?
Yes. The unit integrates with Yokogawa CENTUM VP through the unified Vnet/IP network, enabling Integrated Control and Safety (ICAS) architecture while preserving the physical and logical independence required for safety functions.