Yokogawa AFG20D Enhanced Duplexed FCU 32MB Vnet & RIO

Product Overview

The AFG20D is an enhanced duplexed field control unit (FCU) designed for the Yokogawa CENTUM distributed control system. It features 32 MB of main memory (double the capacity of standard 16 MB models) and is configured for V net and RIO (Remote I/O) networks in a cabinet-mounted form factor. The enhanced memory capacity supports larger control strategies, more complex algorithms, and expanded I/O configurations for demanding process applications.

Key Specifications

• System: Yokogawa CENTUM (Enhanced FCS)
• Type: Duplexed Field Control Unit (for V net and RIO, with cabinet)
• Processor: VR5432 RISC CPU, 133 MHz
• Main Memory: 32 MB
• Memory Backup: Battery-backed, max. 72 hours retention
• Battery Recharge Time: Minimum 48 hours
• Network: V net and RIO
• Mounting: Cabinet-integrated
• Power Supply Options: 100–120 V AC, 220–240 V AC, 24 V DC

Features & Benefits

1. 32MB Enhanced Memory: Double the standard 16 MB capacity, enabling larger control strategies, more function blocks, and expanded data storage.
2. Duplexed Redundancy: Dual processors, power supplies, and network interfaces provide fault-tolerant control with automatic failover.
3. V net & RIO Compatibility: Supports both the high-speed V net control bus and RIO remote I/O network for flexible system architecture.
4. Cabinet-Mounted Design: Integrated cabinet form factor simplifies installation, cable management, and environmental protection.
5. Extended Battery Backup: 72-hour memory retention ensures control data survives extended power outages.

FAQ

Q: What is the difference between AFG20D and AFS20D?
A: The AFG20D is an enhanced duplexed FCU with 32 MB memory. The AFS20D is a standard duplexed FCU with 16 MB memory. Both support V net and RIO networks.

Q: Is the AFG20D compatible with CENTUM VP?
A: The AFG20D is part of the CENTUM family. Verify specific software revision compatibility with your CENTUM VP engineering station.

Q: Can I upgrade an AFS20D to AFG20D specifications?
A> The memory and processor configurations are fixed per model. To upgrade from 16 MB to 32 MB, replace the AFS20D with an AFG20D unit.

Installation Guide

• Position the cabinet in a climate-controlled equipment room with adequate clearance for ventilation and maintenance access.
• Connect redundant power feeds to the FCU's dual power entry points.
• Connect V net cables to the control network backbone.
• Connect RIO cables to remote I/O racks and node units.
• Configure the FCU node address and redundancy parameters via CENTUM engineering tools.
• Download the control strategy and verify redundant failover by simulating a primary fault.

Selection Tips

• Memory Requirements: Choose the AFG20D when your control strategy exceeds 16 MB or when planning for future expansion.
• Network Type: The AFG20D supports RIO networks. For FIO (Fieldbus I/O) networks, select the AFG30D or AFG40D series.
• Migration Planning: The AFG20D is suitable for upgrading legacy CENTUM V or CENTUM-XL systems using migration kits.