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- Yokogawa
- AFS40D
- Duplex Field Control Unit
- Japan
- 207 × 265.9 x 482.6 mm
- 8 kg
- Xiamen, China
- New & In Stock
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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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 AFS40D Duplex Field Control Unit (FCU) is a high-capacity controller used in Yokogawa distributed control systems (DCS), particularly within CENTUM VP / CENTUM CS architectures. It serves as the central processing unit of a Field Control Station (FCS), responsible for executing real-time control logic, managing I/O communication, and ensuring stable plant-wide automation.
The AFS40D is designed with a duplex redundant architecture, making it suitable for large-scale, high-availability industrial systems where continuous operation is critical.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | AFS40D |
| Product Type | Duplex Field Control Unit (FCU) |
| System Role | Central controller for Field Control Station (FCS) |
| Control Architecture | Duplex redundant CPU system |
| Communication | Vnet / Vnet/IP + FIO / ESB bus |
| Function | Real-time process control and I/O management |
| Redundancy | Full CPU duplex redundancy |
| Processing Type | Industrial RISC processor architecture |
| Memory | Battery-backed system memory |
| Power Supply | AC/DC industrial configuration |
| Dimensions | 207 × 265.9 × 482.6 mm |
| Weight | 8 kg |
| Mounting Type | 19-inch rack / cabinet-mounted |
| Operating Environment | Industrial control cabinet environment |
| System Compatibility | Yokogawa CENTUM VP / CENTUM CS / FCS systems |
Function and Working Principle
The AFS40D operates as the core processing engine of a distributed control system.
Its main functions include:
- Collecting real-time process data from I/O modules
- Executing control strategies such as PID, sequencing, and interlocks
- Managing communication across Vnet/Vnet-IP networks
- Synchronizing data between redundant CPU modules
- Sending control outputs back to field devices
The duplex architecture ensures continuous operation, allowing automatic failover if one controller becomes unavailable.
Role in Industrial Control Systems
Within Yokogawa DCS architecture, the AFS40D plays a central role:
- Acts as the main controller of the Field Control Station (FCS)
- Executes mission-critical control logic
- Coordinates all connected I/O modules
- Ensures system-wide synchronization
- Provides high availability through redundancy
It is a core component in large-scale industrial automation systems.
Industrial Applications
The Yokogawa AFS40D is widely used in:
- Distributed Control Systems (DCS)
- Oil and gas production facilities
- Petrochemical and refinery plants
- Power generation systems
- Chemical processing industries
- Large-scale industrial automation systems
It is designed for 24/7 continuous operation in high-demand environments.
Installation and System Integration
For proper operation, the AFS40D should be installed as follows:
- Mounted in standard 19-inch industrial racks
- Connected to Vnet / Vnet-IP communication networks
- Integrated with ESB / FIO node systems
- Installed in controlled cabinet environments
- Proper grounding and EMI shielding applied
Correct installation ensures long-term stability and redundancy performance.
Compatible System Components
The AFS40D typically works with:
- Yokogawa FIO I/O modules
- ESB / ER bus node units
- Vnet / Vnet-IP communication modules
- Analog and digital interface modules
- CENTUM VP system platforms
These components rely on the FCU for centralized control and coordination.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| AFS30D | FCU (Duplex) | Mid-range controller | Medium-large systems |
| AFF50D | FCU platform | Higher integration performance | Large-scale systems |
| AFV10D | Compact FCU | Space-saving design | Small systems |
| AFG40D | FCU variant | Enhanced processing capability | High-performance control |
| AFS series | FCU family | Scalable architecture | Industrial automation systems |
Key Advantages
- Full duplex redundant architecture
- High-performance real-time control
- Stable integration with Yokogawa DCS systems
- Strong fault tolerance and automatic failover
- Scalable system architecture for large plants
- Designed for continuous industrial operation
Technical FAQs
What is the main function of the AFS40D?
It is the central controller of a Yokogawa Field Control Station, executing real-time industrial process control.
Is it a PLC?
No, it is a DCS Field Control Unit designed for large-scale continuous process automation.
Does it support redundancy?
Yes, it uses a duplex CPU architecture for fail-safe operation.
Conclusion
The Yokogawa AFS40D Duplex Field Control Unit is a high-capacity core controller in industrial automation systems. With its duplex redundancy, strong processing capability, and deep integration with Yokogawa DCS architecture, it ensures stable, reliable, and continuous operation in mission-critical industrial environments.