The Yokogawa AFV30D Duplexed Field Control Unit (FCU) is a high-performance 19-inch rack-mounted redundant controller for CENTUM VP Distributed Control Systems using Vnet/IP and Field Control I/O (FIO). The controller employs dual processor modules operating in active and standby modes with continuous memory synchronization and automatic failover to provide uninterrupted process control. It supports redundant Vnet/IP communication, redundant power supplies, battery-backed memory, and high-capacity FIO node connections, making it suitable for large-scale and safety-critical industrial automation applications. Proper installation, network configuration, grounding, and commissioning are essential to achieve maximum controller availability and long-term system reliability.

Contents

• 1. AFV30D Overview
• 2. Technical Features
• 3. Typical Applications
• 4. Installation Planning
• 5. Hardware Inspection
• 6. Installation Environment
• 7. Rack Mounting Procedure
• 8. Power Supply Connections
• 9. Vnet/IP and FIO Network Connections
• 10. Grounding Requirements
• 11. Commissioning Procedure
• 12. Functional Testing
• 13. Preventive Maintenance
• 14. Practical Installation Case
• 15. Frequently Asked Questions

AFV30D Overview

The AFV30D is a duplexed Field Control Unit designed for high-availability process automation. The active processor executes control applications while the standby processor continuously synchronizes configuration data, application memory, and execution status. Automatic processor switchover occurs without interrupting process operation if the active controller experiences a fault. The controller communicates with Human Interface Stations (HIS), Engineering Stations (ENG), and distributed FIO node units over redundant Vnet/IP networks.

Technical Features

• Duplexed processor architecture
• 19-inch rack-mounted design
• Dual-redundant Vnet/IP interfaces
• Dual-redundant power supply support
• 32 MB battery-backed memory
• Automatic processor synchronization
• Battery memory retention up to approximately 72 hours
• Support for large-scale FIO node configurations

Typical Applications

• Oil and gas production
• Petrochemical complexes
• Chemical manufacturing plants
• Power generation facilities
• LNG processing terminals
• Large-scale continuous process industries

Installation Planning

• Review system engineering drawings.
• Verify rack installation location.
• Confirm redundant power availability.
• Plan Vnet/IP network topology.
• Prepare controller configuration files.

Hardware Inspection

• Verify controller model and suffix code.
• Inspect processor modules.
• Inspect power supply modules.
• Verify communication interfaces.
• Check supplied accessories.

Installation Environment

• Maintain adequate cabinet ventilation.
• Avoid excessive humidity.
• Protect equipment from vibration.
• Prevent conductive dust contamination.
• Maintain specified ambient operating temperature.

Rack Mounting Procedure

1. Disconnect all incoming power.
2. Install the controller into the designated rack position.
3. Secure mounting hardware.
4. Install redundant power modules.
5. Connect Vnet/IP interfaces.
6. Verify all connections before energizing.

Power Supply Connections

• Connect redundant power inputs.
• Verify rated input voltage.
• Inspect protective breakers.
• Confirm wiring integrity.
• Verify power indicators after startup.

Vnet/IP and FIO Network Connections

• Connect redundant Vnet/IP Ethernet interfaces.
• Verify managed switch configuration.
• Connect FIO node units.
• Confirm controller IP configuration.
• Label all network cables.

Grounding Requirements

• Connect protective earth.
• Verify rack grounding continuity.
• Maintain low grounding resistance.
• Avoid ground loops.
• Inspect grounding conductors periodically.

Commissioning Procedure

VERIFY INSTALLATION
CONNECT POWER
VERIFY GROUNDING
CONNECT VNET/IP NETWORK
CONNECT FIO NETWORK
POWER UP BOTH PROCESSORS
VERIFY SYNCHRONIZATION
DOWNLOAD CONTROL APPLICATION
VERIFY SYSTEM OPERATION

Functional Testing

• Verify active processor operation.
• Confirm standby processor synchronization.
• Perform automatic failover testing.
• Verify Vnet/IP communication.
• Confirm normal FIO node communication.

Preventive Maintenance

• Inspect Ethernet communication cables regularly.
• Review controller diagnostic logs.
• Verify processor synchronization status.
• Replace backup batteries according to maintenance schedules.
• Maintain controller firmware and configuration backups.

Practical Installation Case

During commissioning of a petrochemical control system, engineers observed that the standby processor remained in an unsynchronized state after startup.

Investigation revealed that one redundant Vnet/IP interface had been connected to an isolated VLAN, preventing processor synchronization.

After correcting the network configuration:

• Processor synchronization completed successfully.
• Automatic failover testing passed.
• All FIO node units communicated normally.
• The controller entered continuous production service.

Frequently Asked Questions

Does the AFV30D support automatic processor redundancy?

Yes. The AFV30D continuously synchronizes active and standby processors and performs automatic failover if the active processor experiences a fault.

Which communication network does the AFV30D use?

The controller communicates through redundant Vnet/IP Ethernet networks and supports distributed FIO node units for field I/O processing.

How long is controller memory retained after power loss?

The battery-backed memory retains controller data for approximately 72 hours when the backup battery is fully charged.

Summary

Proper installation of the Yokogawa AFV30D Duplexed Field Control Unit requires secure rack mounting, redundant power connections, reliable Vnet/IP networking, correct FIO communication wiring, effective grounding, and comprehensive commissioning. Following these procedures ensures maximum controller availability, reliable processor redundancy, and stable long-term process automation performance.