Powering Legacy Systems with Intelligence — A Deep Dive into ABB Bailey Infi 90 and Net 90

Powering Legacy Systems with Intelligence — A Deep Dive into ABB Bailey Infi 90 and Net 90

In the ever-evolving world of industrial automation, legacy systems continue to play a critical role in many facilities. The ABB Bailey Infi 90 and Net 90 Distributed Control Systems (DCS) are prime examples of enduring technology that still deliver robust performance in today's demanding industrial environments. These systems have been foundational in various process control industries for decades and continue to be supported by ABB due to their proven reliability and flexibility.

1. Legacy with Longevity: Proven Reliability

The ABB Bailey Infi 90 and Net 90 systems were originally developed to provide advanced control capabilities for power generation, chemical processing, water treatment, and other industrial sectors.

Deployed globally in critical infrastructure projects since the 1980s

Designed for high-availability process control and long lifecycle support

Known for exceptional system reliability and robustness under harsh conditions

2. Modular Architecture for Flexible Deployment

The architecture of the ABB Bailey Infi 90 and Net 90 is based on a modular, scalable design that allows users to tailor the system according to their operational needs.

I/O modules, processors, and power supplies organized in functionally grouped nodes

Supports both centralized and distributed configurations

Facilitates incremental system upgrades with minimal disruption

3. Advanced Control Capabilities

Though legacy by design, the ABB Bailey Infi 90 and Net 90 platforms incorporate powerful control algorithms and processing capabilities.

Real-time loop control for analog and digital signals

Advanced PID, ratio, cascade, and feedforward control functions

Redundant controllers and communication paths for fault tolerance

4. Seamless Integration and Communication

Communication flexibility is a key strength of the ABB Bailey Infi 90 and Net 90, enabling effective integration with newer systems and third-party devices.

Supports various communication protocols including Ethernet, Modbus, and proprietary links

Can be integrated into modern SCADA and HMI systems using ABB Harmony or third-party interfaces

Facilitates system modernization without requiring complete replacement

5. Upgrade Path and Continued Support

ABB continues to offer support and migration options for both ABB Bailey Infi 90 and Net 90 users.

Replacement modules and parts available through ABB’s lifecycle services

Migration to ABB’s Symphony Plus platform while retaining I/O investment

Engineering support and technical documentation for maintenance and troubleshooting

6. Ideal Use Cases and Industry Applications

The ABB Bailey Infi 90 and Net 90 systems remain in use across a wide variety of industries due to their stability and adaptability.

Power generation (coal, nuclear, hydro)

Oil & gas and petrochemical refineries

Water and wastewater treatment plants

Pulp and paper production facilities

These systems are especially favored in environments where long-term control integrity is prioritized over frequent technology changes.

A Timeless Solution for Mission-Critical Control

The ABB Bailey Infi 90 and Net 90 systems are a testament to the engineering excellence of legacy control platforms. With their modular design, extensive I/O capabilities, and robust performance, they continue to serve mission-critical industries reliably. ABB’s commitment to supporting and modernizing these systems ensures that plant operators can confidently plan for the future without losing the benefits of their existing investment.

For more information about Emerson Ovation System DCS Card or to request a quote,

please contact Director_Miya

Email: sales@amikon.cn

WeChat: 86-18020776792

WhatsApp: 86-18020776792

Recommended models

ABB SDCS-CON-2A 3ADT309600R0002 Control Board

The ABB SDCS‑CON‑2A (model 3ADT309600R0002) is a digital control board designed for ABB DCS/DC drive systems (especially DCS 500 or DCS 600 series DC drives) for precise control of motor speed, torque and system diagnostics. Built-in high-speed microprocessor supports real-time adjustment of control strategies and precise management of drive parameters.

ABB SPNIS21 Network Interface Slave Module

ABB SPNIS21 is a key network interface slave module in ABB System800xA/SymphonyPlus system. It is responsible for connecting C-net bus and upper network. It has multi-protocol support, high reliability, intelligent diagnosis and remote management functions. It is suitable for deployment in industrial automation application scenarios with strict requirements on communication stability and operation and maintenance reliability.

ABB AI845 3BSE023675R1 Analog Input Module

ABB AI845 (3BSE023675R1) is a high-precision 8-channel analog input module that supports multiple voltage/current signal inputs, redundant operation, HART communication and comprehensive diagnostic functions. It is suitable for strict industrial process control systems under the ABB System800xA / S800 I/O architecture. 8 analog input channels can be configured as voltage or current input according to the MTU used (such as TU844/TU845).