YOKOGAWA VI702 high-speed Vnet/IP Interface Module

The Yokogawa VI702 is a high-speed Vnet/IP Interface Module designed for the CENTUM VP Distributed Control System (DCS).

It serves as the primary communication gateway between the Field Control Station (FCS) and the real-time Vnet/IP control network.

1. Introduction

The VI702 is installed in the processor slot of a Field Control Unit (such as the AFV30 or AFV40).

Its core purpose is to enable 1 Gbps Ethernet-based communication using Yokogawa's proprietary Vnet/IP protocol.

This module ensures that process data, alarms, and control commands are transmitted with high reliability and determinism across the plant network.

It is a critical component for modernizing plant architecture from older coaxial-based V-net to modern fiber or copper Ethernet-based systems.

2. Technical Parameter Table

3. Related Models

The VI702 is usually paired with processor modules and network hardware within the CENTUM VP ecosystem:

CP461 / CP471: The Processor Modules (CPUs) that sit alongside the VI702 in the controller rack.

VI701: The earlier version of the Vnet/IP interface card (often replaced by the VI702).

AV870: A Vnet/IP software license often required to enable communication features.

YCB141: While not used for VI702. it is the legacy cable replaced by standard Ethernet in VI702 setups.

4. Product Advantages and Features

High Bandwidth: Leveraging 1 Gbps speeds allows the system to handle massive amounts of data from high-density I/O nodes without network congestion.

Deterministic Communication: Unlike standard office Ethernet, Vnet/IP ensures that control data has priority, guaranteeing that safety and control signals arrive within fixed time windows.

Redundant Pathing: Features two ports to connect to separate network switches (Bus 1 and Bus 2). If one cable or switch fails, the module switches paths instantly without losing a single data packet.

Ease of Integration: Uses standard RJ45 connectors and Ethernet cabling, significantly reducing the cost of installation compared to specialized coaxial systems.

5. Application Cases

Large-Scale Plant Integration: Connecting multiple Field Control Stations across a massive refinery using an Ethernet backbone.

System Migration: Upgrading legacy CENTUM CS 3000 systems to CENTUM VP by replacing coaxial V-net cards with VI702 Vnet/IP interfaces.

Remote Monitoring: Enabling high-speed data transfer to Plant Resource Manager (PRM) software for advanced device diagnostics and asset management.

6. Other Models in the Same Series

VI702-S1: Standard version for general industrial environments.

VI702-S5: Enhanced version with G3 conformal coating for protection against corrosive gases (typical in chemical and wastewater plants).

VF702: The PCI Express version of this card used in the Human Interface Station (HIS) or Server PCs to connect them to the Vnet/IP network.