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- Yokogawa
- AFF50D
- FIO Field Control Unit
- Japan
- 480 x 290 x 140 mm
- 4.54 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 AFF50D Field Control Unit (FCU) is a core processor module used in Yokogawa CENTUM VP distributed control systems (DCS). It functions as the central controller of a Field Control Station (FCS), executing control logic, managing I/O communication, and coordinating system-wide data exchange.
This unit is designed for high-reliability, redundant industrial automation systems, supporting continuous operation in mission-critical process environments such as oil & gas, petrochemical, and power generation plants.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | AFF50D |
| Product Type | Field Control Unit (FCU) |
| System Role | Central processor for Field Control Station (FCS) |
| Processor | VR5432 RISC CPU, 133 MHz |
| Memory | 32–64 MB (model dependent) |
| Memory Backup | Battery-backed, up to 72 hours retention |
| Communication | Dual-redundant Vnet/IP + ESB bus |
| Redundancy | Duplexed (CPU + communication + power) |
| Power Supply | 100–240 V AC / 24 V DC (variant dependent) |
| Power Consumption | Approx. 200–230 VA (AC models) |
| Mounting Type | 19-inch rack-mounted |
| Dimensions | ~480 × 290 × 140 mm |
| Weight | ~4.5–8 kg (variant dependent) |
| Operating Temperature | -10°C to +55°C |
| Protection Class | Industrial cabinet installation |
| System Compatibility | CENTUM VP / FIO / FCS architecture |
Function and Working Principle
The AFF50D acts as the central processing and control engine of a distributed control system.
Its working process includes:
- Receiving process data from field I/O modules
- Executing control logic (PID, interlock, sequencing)
- Managing communication across Vnet/IP and ESB bus networks
- Coordinating redundancy between primary and standby controllers
- Sending control outputs back to field devices via I/O modules
The duplex architecture ensures that if one controller fails, the standby unit takes over instantly without process interruption.
Role in Industrial Control Systems
Within Yokogawa automation architecture, the AFF50D serves as the core of the Field Control Station (FCS):
- Executes real-time process control strategies
- Coordinates all connected I/O modules
- Ensures system-wide synchronization
- Provides fault tolerance through redundancy
- Maintains stable operation of critical industrial processes
It is one of the most important components in Yokogawa DCS infrastructure.
Industrial Applications
The Yokogawa AFF50D Field Control Unit is widely used in:
- Distributed Control Systems (DCS)
- Oil and gas production and refining
- Petrochemical processing plants
- Power generation facilities
- Chemical manufacturing systems
- Large-scale industrial automation systems
It is especially suitable for 24/7 continuous process environments requiring high availability.
Installation and System Integration
For optimal performance, the AFF50D should be installed as follows:
- Mounted in standard 19-inch industrial racks
- Connected to Vnet/IP network infrastructure
- Integrated with ESB bus I/O node systems
- Proper grounding and shielding applied
- Installed in temperature-controlled control cabinets
Correct installation ensures system stability and redundancy performance.
Compatible System Components
The AFF50D typically works with:
- Yokogawa FIO I/O modules
- ESB / ER bus node units
- Vnet/IP communication modules
- Analog and digital signal interface modules
- CENTUM VP system software platforms
These components rely on the FCU for centralized control and coordination.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| AFF50S | Field Control Unit | Single configuration version | Standard systems |
| AFF50D-H41201 | Duplex FCU | Enhanced redundancy | High-availability systems |
| AFV10D | Field Control Unit | Compact architecture | Smaller systems |
| AFV40S | FCU Node Unit | Distributed expansion | Large-scale systems |
| AFG series | FCU family | Modular control platform | Complex DCS networks |
Key Advantages
- Full duplex redundancy architecture
- High-speed real-time process control
- Stable integration with FIO systems
- Supports mission-critical industrial operation
- Strong fault tolerance and self-diagnostics
- Scalable modular architecture
Technical FAQs
What is the main function of the AFF50D?
It acts as the central controller for Yokogawa Field Control Stations.
Is it a PLC?
No, it is a DCS Field Control Unit designed for large-scale process automation.
Does it support redundancy?
Yes, it uses duplex architecture for CPU, communication, and power reliability.
Conclusion
The Yokogawa AFF50D Field Control Unit is a high-performance industrial controller that serves as the core of Yokogawa DCS systems. With its duplex redundancy, real-time processing capability, and deep system integration, it ensures stable and continuous operation in mission-critical industrial environments.