Application Scenarios

In a 300 MW coal-fired power plant, the boiler combustion control and turbine sequencing rely on the real-time data exchange between dozens of I/O racks and the operator stations. The ABB SPNPM22​ modules installed in each remote PCU cabinet continuously poll data from analog/digital modules over the ControlWay bus. During a sudden coal mill trip, the SPNPM22​ prioritizes the exception report, stamping it with a precise sequence-of-event (SOE) timestamp and routing it within milliseconds over the INFI-NET fiber ring to the central historian. This allows operators to immediately see the causal chain of events, preventing a cascading unit trip. In this scenario, the module’s role as a deterministic network router is critical for maintaining grid stability.

Parameter

Main Parameters	Value/Description
Product Model​	SPNPM22​ (replaces INNPM22)
Manufacturer​	ABB (Bailey Controls)
Product Category​	Network Processor Module (NPM)
Compatible Systems​	Bailey INFI 90, Symphony Plus, Harmony Rack
CPU / Processor​	32-bit RISC (ColdFire MCF5407 160 MHz typical)
Memory​	8 MB DRAM, 512 KB NVRAM (typical)
Communication Ports​	ControlWay (1.0 Mbaud), INFI-NET (Cnet), RS-232 Service Port
Data Throughput​	Sustained: ~2000 XR/s; Burst: >6000 XR/s
Redundancy Support​	Yes (Hot-Standby with paired NPM)
Power Supply​	+5 VDC via backplane (≈2 A, 10 W)
Operating Temperature​	0°C to +60°C (industrial range)
Status Indicators​	16-segment LED display (Run, Fail, Comm, etc.)
Dimensions​	Standard INFI 90 module form factor

 

 

Technical Principles and Innovative Values

• Innovation Point 1: Dual-Network Gateway Architecture:​ The SPNPM22‘s core innovation lies in its dual-bus master​ design. It seamlessly bridges the high-speed peer-to-peer INFI-NET​ plant loop (Cnet) with the local ControlWay​ I/O bus within the PCU. This architecture allows for efficient, deterministic data exchange between geographically dispersed control units and the central operator interface without overloading the controller’s computational resources, a critical feature for large-scale DCS applications.
• Innovation Point 2: High-Performance Exception Reporting:​ Unlike simple data loggers, the SPNPM22​ implements intelligent exception-based reporting. It monitors the HCU database for significant data changes (exceptions) rather than continuously transmitting all data. This mechanism drastically reduces network traffic congestion while ensuring that critical process alarms and events are communicated with minimal latency, which is vital for safety instrumented systems (SIS).
• Innovation Point 3: Seamless Legacy System Longevity:​ As the designated spare for the INNPM22, the SPNPM22​ provides a drop-in hardware replacement​ that extends the operational life of legacy INFI 90 systems by decades. Its compatibility with existing racks, backplanes, and network configurations allows plants to avoid costly full-system migrations while maintaining high availability and leveraging modern firmware updates.

 

Application Cases and Industry Value

Case Study: Refinery Distributed Control System Modernization.​ A major Gulf Coast refinery was facing obsolescence issues with its 1990s-era Bailey INFI 90 system controlling the fluid catalytic cracking (FCC) unit. A full DCS replacement would require a multi-week shutdown and millions of dollars in capital expenditure. Instead, the plant opted for a phased lifecycle management strategy. They procured and installed ABB SPNPM22​ modules to replace failing INNPM22​ cards across their PCU nodes. The SPNPM22​ modules integrated flawlessly into the existing hardware racks and INFI-NET 90 network. This intervention restored network reliability and added enhanced diagnostic capabilities without any changes to the control logic or operator graphics. The refinery estimated a cost saving of over 60% compared to a full system rip-and-replace, while extending the DCS lifespan by an additional 15 years.