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- Yokogawa
- AFS20D
- Duplex Field Control Unit
- Japan
- 207 × 265.9 x 482.6 mm
- 8 kg
- Xiamen, China
- New & In Stock
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All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Yokogawa AFS20D Duplex Field Control Unit (FCU) is a high-reliability core controller used in Yokogawa distributed control systems (DCS), especially within CENTUM VP / CENTUM CS architectures. It functions as the central processing unit of a Field Control Station (FCS), executing real-time control logic, managing I/O communication, and ensuring uninterrupted plant operation.
Designed with a duplex redundancy architecture, the AFS20D ensures continuous control performance in mission-critical industrial environments where downtime is not acceptable.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | AFS20D |
| Product Type | Duplex Field Control Unit (FCU) |
| System Role | Central controller for Field Control Station |
| Control Architecture | Duplex redundant CPU system |
| Communication | Vnet/IP / RIO / ESB bus (system dependent) |
| Control Function | Real-time process control and I/O management |
| Redundancy | Full duplex CPU and system redundancy |
| Memory | Battery-backed system memory |
| Power Supply | 24 V DC / AC system compatible (configuration dependent) |
| Power Consumption | Industrial-grade high-reliability design |
| Dimensions | 207 × 265.9 × 482.6 mm |
| Weight | 8 kg |
| Mounting Type | 19-inch rack / cabinet-mounted |
| Operating Temperature | Industrial control cabinet environment |
| System Compatibility | Yokogawa CENTUM VP / CENTUM CS 3000 |
Function and Working Principle
The AFS20D operates as the core processing engine of a distributed control system.
Its working process includes:
- Collecting real-time process data from I/O modules
- Executing control strategies such as PID, sequencing, and interlocks
- Coordinating communication between field nodes and system networks
- Synchronizing data across redundant CPU units
- Sending control outputs back to field devices through I/O systems
The duplex structure ensures that if one controller fails, the standby unit automatically takes over without interrupting plant operations.
Role in Industrial Control Systems
Within Yokogawa automation architecture, the AFS20D plays a central role:
- Acts as the main processor of the Field Control Station (FCS)
- Executes mission-critical control logic in real time
- Manages all connected I/O and communication modules
- Ensures system-wide synchronization and stability
- Provides fault tolerance through full redundancy
It is one of the most critical components in modern DCS infrastructure.
Industrial Applications
The Yokogawa AFS20D is widely used in:
- Distributed Control Systems (DCS)
- Oil and gas production facilities
- Petrochemical and refining plants
- Power generation systems
- Chemical processing industries
- Large-scale industrial automation systems
It is designed for 24/7 continuous operation in high-risk environments.
Installation and System Integration
For optimal performance, the AFS20D should be installed as follows:
- Mounted in standard 19-inch industrial control racks
- Integrated into Yokogawa Vnet/IP communication networks
- Connected to ESB / RIO node systems
- Installed in temperature-controlled control cabinets
- Proper grounding and electromagnetic shielding applied
Correct installation ensures long-term system stability and redundancy performance.
Compatible System Components
The AFS20D typically works with:
- Yokogawa FIO I/O modules
- ESB / RIO node units
- Vnet/IP communication modules
- Analog and digital signal interface modules
- CENTUM VP engineering and control software
These components rely on the FCU for centralized processing and coordination.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| AFF50D | Field Control Unit | Higher-capacity FCU platform | Large-scale DCS systems |
| AFS10D | FCU (Duplex) | Standard control capacity | Medium industrial systems |
| AFV10D | Compact FCU | Space-saving design | Small-scale systems |
| AFG20D | FCU Processor Module | Enhanced processing performance | High-speed control systems |
| CENTUM VP FCU Series | System platform | Full DCS integration | Enterprise-level automation |
Key Advantages
- Full duplex redundancy architecture
- High-speed real-time process control
- Stable integration with Yokogawa DCS systems
- Strong fault tolerance and failover capability
- Scalable system expansion support
- Designed for continuous industrial operation
Technical FAQs
What is the main function of the AFS20D?
It serves as the central controller of a Yokogawa Field Control Station, executing real-time process control.
Is it a PLC?
No, it is a DCS Field Control Unit designed for large-scale industrial process control.
Does it support redundancy?
Yes, it uses a duplex architecture for full system redundancy.
Conclusion
The Yokogawa AFS20D Duplex Field Control Unit is a mission-critical component in industrial automation systems. With its duplex redundancy design, real-time processing capability, and deep integration with Yokogawa DCS architecture, it ensures stable and continuous operation in demanding industrial environments.
For engineers and system integrators, it provides a reliable core control platform for building high-availability, scalable, and robust automation systems.