Excellent PLC
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Product Introduction
The Yokogawa SSC50D-S2121 Duplexed Safety Control Unit is a high-reliability component designed for use in safety instrumented systems (SIS). It ensures continuous and secure operation by providing duplexed (redundant) control, minimizing the risk of single-point failures. This control unit is primarily implemented in critical industrial processes where system safety and uninterrupted performance are of utmost importance, such as oil & gas, petrochemical, power generation, and chemical plants.
Technical Specifications
| Parameter | Description |
|---|---|
| Model | Yokogawa SSC50D-S2121 Duplexed Safety Control Unit |
| Control Type | Duplexed safety control (redundant configuration) |
| Processor | High-performance dual-redundant CPU |
| Power Supply | 24 VDC (redundant input supported) |
| Dimensions | 482.6 x 266 x 88.1 mm |
| Weight | 8.5 kg |
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -20 to 70 °C |
| Certifications | SIL3 (IEC 61508 compliant), IEC 61511 ready |
| Diagnostic Functions | Self-checking, error detection, watchdog timer |
| Mounting | Cabinet rack mounting |
| System Redundancy | CPU, power supply, and communication redundancy |
Product Applications
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Emergency shutdown (ESD) systems in oil refineries
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Burner management systems in power plants
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Process safeguarding in petrochemical complexes
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Safety control in gas processing facilities
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Chemical reactor overpressure and temperature protection
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Integrated safety system (ISS) applications in distributed control systems (DCS)
Product Advantages
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High Reliability: Duplex architecture ensures continuous operation even if one module fails.
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Safety-Certified: Designed to comply with SIL3, ensuring the highest level of safety integrity.
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Redundancy at Multiple Levels: CPU, power, and communication redundancy minimize downtime risk.
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Advanced Diagnostics: Continuous self-checking and fault isolation allow for proactive maintenance.
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Flexible Integration: Easily integrates with Yokogawa’s ProSafe-RS and other control environments.
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Scalability: Suitable for both small-scale safety systems and large-scale plant-wide safety integration.
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Extended Lifecycle Support: Built for long-term plant use with backward compatibility and vendor support.
FAQ
Q1: How does the SSC50D-S2121 handle CPU redundancy?
A1: The unit employs dual CPUs running in parallel. If one fails, the second CPU continues execution seamlessly without disrupting safety functions.
Q2: What safety standard level does the SSC50D-S2121 comply with?
A2: It is certified to SIL3 under IEC 61508, making it suitable for high-integrity safety functions.
Q3: Can the SSC50D-S2121 be integrated with ProSafe-RS?
A3: Yes, it is fully compatible with Yokogawa ProSafe-RS, enabling unified safety and process control management.
Q4: What happens if a power supply unit fails?
A4: The duplex power configuration ensures continuous operation. The system automatically switches to the redundant supply without interruption.
Q5: Does the SSC50D-S2121 support hot swapping of modules?
A5: Yes, critical modules such as power supply and CPU can be hot-swapped to minimize downtime.
Q6: What diagnostic features are available?
A6: The unit provides watchdog timers, error detection, continuous self-checking, and fault isolation to maintain system integrity.
Q7: How is communication redundancy achieved?
A7: It uses dual communication paths, ensuring that even if one network fails, the other maintains safe and reliable data transfer.
Q8: Can it be used in harsh environments?
A8: Yes, with its robust design, it supports operation in industrial temperature ranges and is resistant to vibration and electrical noise.
Q9: How is synchronization maintained between redundant CPUs?
A9: The CPUs constantly exchange state information over a high-speed internal bus, ensuring synchronized execution of safety logic.
Q10: What type of I/O modules can be connected?
A10: The SSC50D-S2121 supports Yokogawa safety I/O modules, including digital input, digital output, and analog input/output units designed for SIS applications.
Recommended Same-Series or Related Models
| Model | Description |
|---|---|
| SSC10D | Basic safety control unit for smaller systems |
| SSC20D | Standard safety control unit with redundancy options |
| SSC50D | Advanced safety control unit |
| SSC60D | Enhanced duplexed safety control with extended diagnostics |
| SSC100D | Large-scale system safety controller |
| SSC50D-S1111 | Earlier variant of duplexed safety controller |
Popular Yokogawa Models
| Model | Description |
|---|---|
| AAI141-S50 | Analog Input Module |
| AAI543-S50 | Analog Input Module |
| ADV151-P00 | Digital Input Module |
| ADV551-P00 | Digital Output Module |
| SAI143-H50 | Safety Analog Input Module |
| SDO141-S50 | Safety Digital Output Module |
| SEC401-50 | ESB Bus Coupler Module |
| SSC50D-S2121 | Duplexed Safety Control Unit |
