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
VI702
| Feature | Specification |
| Model Code | VI702 |
| Function | Vnet/IP Interface Module |
| Communication Speed | 1 Gbps (Full Duplex) |
| Interface Port | 1000BASE-T (RJ45) |
| Transmission Distance | Max 100 m (using Cat5e or higher cable) |
| Redundancy | Supported (when used in redundant FCU configurations) |
| Connector Type | Dual RJ45 ports for redundant network paths |
| Current Consumption | 0.5 A (at 5 V DC) |
| Weight | Approx. 0.35 kg |
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.
| ALSTOM | V4561484-0100 |
| ALSTOMA | AL129A |
| Altas Copco | TC-4000-P-PB-ES |
| AMAT | COMPONENT SIDE |
| AMAT | 0100-71267 |
| AMAT | 0190-37519 |
| AMAT | 0200-00672 |
| AMAT | 0021-84842 |
| AMAT | 0195-14157.RMA |
| AMAT | 0190-14502 |
| AMAT | 0010-23716 |
| AMAT | 0010-23715 |
| AMAT | 0190-15779 |
| AMCI | 1241 |
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.