Foxboro I/A Series DCS: A Comprehensive Hardware Guide

Overview

Invensys Operations Management offers top-tier feedwater control systems through the Foxboro® I/A Series® Distributed Control System (DCS). The latest implementations provide operational enhancements, improved performance during startup and runtime, and substantial reductions in unplanned unit trips. Advanced control techniques enable greater automation, reducing operator interaction even during challenging processes such as startup and shutdown—points where unit trips commonly occur. This makes the system more resilient in handling both standard operations and unexpected process conditions.

Introduction

Foxboro has continuously evolved the I/A Series DCS through multiple versions, starting with a node design and advancing to a mesh design. Each iteration aims to boost system performance and expand future capabilities. The latest generation, Foxboro Evo, extends the I/A Series legacy by integrating Foxboro control expertise and Triconex safety solutions. This provides additional protection, operational insights, and compatibility with prior system generations, ensuring smooth upgrades for existing I/A Series customers.

Hardware Overview: Node Design

The I/A Series DCS architecture is based on a modular system that enables flexibility and scalability. Below are the core modules:

Processor Modules

1. Application Processor (AP)
   • Functions as a server, hosting configuration software and storage.
   • Operates on a UNIX OS.
2. Workstation Processor (WP)
   • Serves as the operator’s client interface.
   • Supports UNIX or Microsoft Windows (NT, XP) operating systems.
3. Application Workstation (AW)
   • Combines the roles of AP and WP, capable of handling both server and client functions.
   • Compatible with UNIX or Microsoft Windows (NT, XP) OS.
4. Dual Nodebus 10BaseT Interface (DNBT)
   • Connects AP, WP, or AW modules to the nodebus via Ethernet, facilitating networked communication.
5. Control Processor (CP)
   • Executes control computations and supports single or redundant modes.
   • Connects to the Field Bus Module (FBM), enabling communication with field devices.
   

Fieldbus Modules (FBMs)

FBMs act as I/O modules, interfacing with field devices by receiving analog or digital signals and sending output signals. These modules connect to control processors, making it possible to monitor and control various parameters of the process.

Mounting Structure and Enclosure

The I/A Series DCS modules are installed within a rackmount structure, which organizes and secures the components. This structure is housed within an industrial enclosure to protect it from environmental factors. The modular design allows easy maintenance and expansion, ensuring reliability and longevity in industrial applications.

References

For further technical specifications and updates on the latest I/A Series DCS versions, please visit Foxboro’s official site.