The ABB Bailey SPNPM22 NPM Module: A Complete Guide to the INFI 90 Network Processor

Introduction to the ABB Bailey SPNPM22

In the world of industrial automation, the seamless flow of data is as crucial as the control logic itself. For legacy Bailey INFI 90® systems, the ABB Bailey SPNPM22 Network Processor Module (NPM) is the unsung hero that makes this possible. This powerful communication processor is not just a component; it is the central nervous system for network connectivity within one of history's most robust Distributed Control Systems (DCS).

This article provides a detailed overview of the SPNPM22, its technical capabilities, and why it remains a vital component for industries relying on proven automation technology.

The SPNPM22 is a high-performance Network Processor Module designed for the Bailey INFI 90 and NETWORK 90 product lines. Its primary function is to manage and direct data traffic between the various layers of the control architecture. It acts as a sophisticated gateway, bridge, and protocol converter, ensuring that critical process data reaches its destination accurately and on time.

The power of the SPNPM22 lies in its versatile functionality:

• INFI-NET Loop Interface: It serves as a primary interface to the high-speed, token-passing INFI-NET loop—the data backbone of the INFI 90 system. It manages communication between the loop and the modules in its local node.

• Protocol Conversion: A core function of the SPNPM22 is its ability to perform protocol conversion. This allows the proprietary INFI-NET communication to seamlessly interact with devices using standard serial protocols like Modbus (RTU and ASCII), enabling integration with PLCs, drives, and other third-party equipment.

• Gateway Services: It acts as a gateway to other network levels, such as the OIS (Operator Interface Station) network, facilitating data exchange between the process controllers and the operator workstations for monitoring and control.

• Data Highway Management: The module efficiently handles large volumes of I/O data, scanning points and making them available to the control logic and network, ensuring system-wide data consistency.

The reliability of the SPNPM22 made it a cornerstone in industries where system uptime is critical:

• Power Generation: Managing communication between turbine control systems and auxiliary subsystems.

• Oil & Gas: Integrating wellhead controllers, compressor control panels, and safety systems into a central DCS.

• Water/Wastewater Treatment: Bridging communication between the main controller and remote pump stations or filter beds using standard protocols.

• Chemical Processing: Facilitating data exchange between the DCS and batch processors or specialized analyzer equipment.

While technology continues to advance, thousands of Bailey INFI 90 systems remain in operation worldwide, a testament to their rugged design and reliability. The ABB SPNPM22 module is a key reason for this longevity. Its ability to act as a reliable communication hub and integration gateway ensures that these legacy systems can continue to operate efficiently and interface with modern equipment.

For plant managers and maintenance teams, understanding the role of the SPNPM22 is essential for troubleshooting, system maintenance, and planning future upgrades. Its performance is directly linked to the overall health and capability of the automation system it serves.

Tags: ABB Bailey SPNPM22, Network Processor Module, NPM Module