The Yokogawa VI451-10 is a Vnet/IP Interface Module specifically designed for the Field Control Stations (FCS) of the CENTUM VP Distributed Control System.

While the previously discussed VC401 is for PC-based stations, the VI451 is the hardware component that resides in the controller’s rack (such as the AFV30 or AFV40) to provide it with dual-redundant 1Gbps network connectivity.

1. Introduction

The VI451-10 serves as the primary communication gateway for the AFV series Field Control Stations.

It translates the internal bus signals of the controller into Vnet/IP packets, allowing the controller to communicate with Human Interface Stations (HIS), other controllers, and plant networks. The “-10” style code signifies the standard Ethernet/RJ45 interface version, optimized for high-speed, deterministic control.

2. Technical Parameter Table

3. Product Advantages and Features

True Redundancy: Specifically built to support the dual-redundant architecture of CENTUM VP. It manages two separate network paths simultaneously, ensuring zero data loss during a network failover.

Deterministic Communication: Unlike standard Ethernet, the VI451 uses Yokogawa’s Vnet/IP protocol to ensure control data is delivered within a fixed time window, regardless of background network traffic.

Integrated Diagnostics: The module continuously monitors the health of both network lines and reports physical layer errors (like cable degradation) to the operator before a total failure occurs.

High Throughput: 1 Gbps capacity allows for the transmission of massive amounts of process data, which is essential for modern plants with thousands of I/O points.

Hardware Hardening: Designed for installation directly in industrial cabinets, featuring high vibration resistance and thermal management.

4. Application Cases

Large-Scale Refineries: Providing the communication backbone for Field Control Stations managing thousands of PID loops.

Inter-Controller Data Exchange: Enabling high-speed “peer-to-peer” communication between two different controllers (FCS to FCS) for complex safety or interlocking logic.

DCS Modernization: Used when upgrading older CENTUM systems to CENTUM VP to transition from legacy V net (coaxial) to modern Vnet/IP (Ethernet) infrastructures.

Offshore Operations: Utilized in remote control modules where reliable, redundant communication over fiber (via media converters) is required for safety.

5. Related Models & Same Series

The VI451 is the “Controller-side” equivalent of the VC401 “PC-side” card.

Other Models in the Same Series

VI451-11: A variant typically featuring different style codes or minor hardware revisions for newer backplane versions.

VF702: The legacy V net interface module for older coaxial-based control networks.

VI461: A Vnet/IP interface module used in different rack configurations or specialized bridge units.

Related System Components

AFV30D / AFV40D: The Duplexed Field Control Units where the VI451 is typically installed in pairs.

VC401: The PCI Express card for the HIS (Human Interface Station) that “talks” to the VI451.

AVR10D: The Duplexed Vnet/IP redundant router used to connect different Vnet/IP domains.