Yokogawa AFS40D Duplexed Field Control Unit

The Yokogawa AFS40D Duplexed Field Control Unit is a state-of-the-art control processor used in Yokogawa’s CENTUM VP Distributed Control System (DCS). As a fully redundant (duplexed) FCU, the AFS40D is engineered for critical control processes requiring high availability and operational integrity. Equipped with dual CPUs, dual power supplies, and redundant communication interfaces, this unit ensures uninterrupted control even during hardware or system faults.

Designed for scalability and performance, the AFS40D supports advanced field networks like Vnet/IP, FOUNDATION Fieldbus, HART, and Modbus, and provides seamless integration into the broader CENTUM VP architecture. It is ideal for industries such as oil & gas, chemicals, utilities, pharmaceuticals, and power generation, where reliability, speed, and fault tolerance are essential.

Product Specifications

Product Applications

The AFS40D is built to handle mission-critical applications in industries requiring strict uptime and safety standards. It plays a central role in distributed control environments and safety systems:

• Oil & Gas Processing Facilities

  Real-time control for compressors, pipelines, and ESD systems with duplexed reliability.

• Chemical and Petrochemical Plants

  Advanced batch and continuous process control with fault tolerance.

• Power Generation Stations

  Supervises turbine protection, load management, boiler control, and emergency shutdowns.

• Water and Wastewater Treatment Plants

  Automates plant-wide flow control, chemical injection, pump sequencing, and SCADA integration.

• Pharmaceutical Production Facilities

  Ensures GMP compliance in cleanroom control, batch processing, and validated systems.

• Steel, Cement & Mining Industries

  Controls conveyors, crushers, kilns, and furnaces where robustness is critical.

Product Advantages

• True Duplex Redundancy

  Dual CPUs and dual power supplies ensure zero downtime. Automatic switchover keeps control running continuously in case of hardware failure.

• Enhanced I/O Capacity

  Supports a wide range of Yokogawa analog, digital, and safety modules with expansion capability.

• Real-Time Performance

  Fast deterministic control and communication cycles optimized for complex industrial automation.

• Robust Communication

  Interfaces with modern field networks like Vnet/IP, FOUNDATION Fieldbus, HART, and Modbus.

• Secure System Integrity

  Built-in diagnostics, fault logging, and SIL3 compliance when used with ProSafe-RS enhance system safety.

• Engineering Flexibility

  Seamless configuration through Yokogawa’s engineering workstation, with remote diagnostics support.

• Long-Term Maintainability

  Hot-swappable components and modular architecture reduce maintenance efforts and lifecycle costs.

Frequently Asked Questions (FAQ)

1. What is the primary function of the AFS40D?

   It serves as a duplexed processor node in Yokogawa’s CENTUM VP DCS, handling control logic and I/O management with redundancy.

2. How does AFS40D achieve redundancy?

   It uses dual CPUs, redundant communication modules, and dual power supplies operating in parallel.

3. Is AFS40D hot-swappable?

   Yes, many components including power and communication modules are hot-swappable.

4. Can AFS40D be used in safety-critical systems?

   Yes, when paired with ProSafe-RS, the AFS40D can be part of a SIL3-certified SIS environment.

5. Which protocols does it support?

   It supports Vnet/IP, FOUNDATION Fieldbus, HART, Modbus, Profibus, and OPC UA.

6. What systems is AFS40D compatible with?

   It is designed specifically for Yokogawa’s CENTUM VP distributed control system.

7. Is the AFS40D suitable for harsh environments?

   Yes, it is certified for operation in hazardous areas with CE, ATEX, FM, and CSA compliance.

8. Can the AFS40D be remotely monitored?

   Yes, remote configuration and diagnostics are supported via engineering workstations.

9. How is the CPU switchover handled in duplex mode?

   The system automatically switches to the standby CPU without interrupting control tasks.

10. What is the benefit of using AFS40D over a single FCU?

    It offers enhanced fault tolerance, system uptime, and safety performance for critical operations.