Technical Overview
The Yokogawa SSC10D serves as a dedicated safety control unit for the ProSafe-RS safety instrumented system. This module provides SIL 3 certification according to IEC 61508, making it suitable for emergency shutdown and fire and gas detection applications. Its dual-redundant processor architecture ensures deterministic scanning with a typical cycle time of 10 ms for critical safety loops. The SSC10D achieves fault tolerance through its 1oo2D voting scheme, which compares outputs from two independent processors.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa Electric Corporation |
| Product Type | Safety Control Unit / Logic Solver |
| System | ProSafe-RS |
| Safety Integrity Level | SIL 3 (IEC 61508) / SIL 3 (IEC 61511) |
| Processor Architecture | Dual-redundant (1oo2D voting) |
| Scan Cycle Time | 10 ms (typical) |
| Program Memory | 2 MB Flash (user program) |
| Data Memory | 1 MB RAM (retentive) |
| I/O Capacity | Up to 512 points per unit |
| Communication Interfaces | 2 × Ethernet (Modbus TCP) |
| Serial Ports | 2 × RS-485 (Modbus) |
| Battery Backup | Internal lithium (5 years) |
| Power Supply | 24 VDC |
| Current Draw | 500 mA |
| Diagnostic LEDs | RUN, ERR, I/O, COM, FAULT |
| Dimensions (H x W x D) | 130 x 60 x 120 mm |
| Weight | 0.8 kg |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -20°C to 70°C |
| Protection Class | IP20 |
Safety Architecture and Fault Tolerance
The Yokogawa SSC10D continuously compares the results from its dual processors to detect discrepancies before executing any output commands. This 1oo2D voting scheme ensures that a single hardware fault will not compromise the system’s ability to maintain safe states. Furthermore, the module performs comprehensive self-diagnostics every scan cycle, monitoring memory integrity, I/O circuits, and communication paths for potential failures.
Application and System Integration
This safety control unit supports up to 512 I/O points per unit, accommodating medium to large-scale safety instrumented functions. Its Ethernet interfaces enable connection to Yokogawa’s CENTUM VP DCS for seamless integration of process control and safety systems. Operators can configure and monitor the SSC10D through ProSafe-RS engineering tools, simplifying project execution and maintenance.
Diagnostics and Environmental Performance
The SSC10D provides diagnostic status through multiple LED indicators, aiding in rapid fault identification and system recovery. Its robust construction withstands harsh industrial temperatures and mechanical vibration, ensuring reliable operation in demanding environments.
Details
| Weight | 0.8 kg |
|---|---|
| Dimensions | 130 × 60 × 120 mm |
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