Yokogawa AFV30D-S41251 S2 Duplexed Field Control Unit

The Yokogawa AFV30D-S41251 S2 Duplexed Field Control Unit (FCU) is a high-reliability control platform developed for Yokogawa’s CENTUM VP distributed control system. This model builds upon the proven AFV30D architecture with S2 enhancements, offering stronger redundancy, improved processing capabilities, and advanced fault tolerance.

The FCU is specifically designed for large-scale, mission-critical process industries where downtime and process interruptions are unacceptable. With duplexed CPUs, redundant power supplies, and dual communication paths, the AFV30D-S41251 S2 ensures continuous operation even if critical hardware fails. Its hot-swappable design allows maintenance while the system is live, minimizing plant downtime.

Product Specifications

Product Applications

The AFV30D-S41251 S2 is used in continuous and batch process industries requiring maximum system availability:

• Oil & Gas: Supervisory control for drilling rigs, LNG facilities, and refinery units.

• Power Generation: Boiler and turbine control systems in thermal and nuclear power plants.

• Petrochemical & Chemical Plants: High-precision control of cracking, polymerization, and distillation processes.

• Pharmaceuticals: Batch control with stringent compliance to regulatory requirements.

• Water & Wastewater: Large treatment plants with complex pumping and filtration systems.

• Metals & Mining: Automation of high-temperature and heavy industrial processes.

Product Advantages

• Duplexed Reliability: Redundant CPU, communication, and power modules ensure fault-tolerant operation.

• Fast Response: 50 ms cycle time delivers real-time control and quick response to process fluctuations.

• Enhanced Diagnostics: Advanced self-diagnostics and system monitoring reduce troubleshooting time.

• Hot-Swappable Modules: Maintenance can be performed without system shutdown.

• Backward Compatibility: Smooth integration with existing Yokogawa CS 3000 and earlier CENTUM systems.

• Scalable Design: Supports large I/O counts and can be expanded for bigger installations.

• Industrial Security: Includes access control, secure communication, and audit trail for cyber protection.

• Proven Stability: Built for long-term use in demanding, hazardous industrial environments.

FAQ

1. What is the typical control cycle time for the AFV30D-S41251 S2?

   The unit operates on a 50 ms control cycle, providing fast loop response.

2. How does the duplex CPU system manage failover?

   When the primary CPU fails, the backup CPU immediately takes over without interrupting control.

3. Does the unit support FOUNDATION Fieldbus and HART integration?

   Yes, it supports both FOUNDATION Fieldbus and HART communication protocols.

4. Can configuration updates be applied online?

   Yes, online configuration changes are supported without halting plant operations.

5. What type of redundancy is available for power input?

   It accepts dual 24 V DC inputs, ensuring uninterrupted power supply through redundancy.

6. How is communication redundancy implemented?

   The FCU uses Vnet/IP with dual network paths to eliminate single-point failures.

7. Are the hardware modules hot-swappable?

   Yes, critical components such as CPUs and communication cards are hot-swappable.

8. What is the maximum number of I/O points supported?

   The unit supports up to 1,000 I/O points, expandable with additional units.

9. How does the system handle error detection?

   It employs built-in self-diagnostics with detailed error logging for quick recovery.

10. What cybersecurity features are included?

    The unit includes encrypted communication, user authentication, and system audit trail functions.