Description

The Bailey NTMP01 is a critical network interface module developed by Bailey Controls (now part of ABB) for use within the INFI 90 distributed control system (DCS). As a foundational component of the INFI-NET communication architecture, the Bailey NTMP01 provides robust, redundant data connectivity between controllers, I/O modules, operator stations, and engineering workstations across industrial process plants. Designed for high availability in continuous-operation environments such as power generation, oil & gas, and chemical processing, the Bailey NTMP01 ensures deterministic message delivery over the plant-wide network backbone with built-in fault tolerance.

Positioned as a Network Terminal Module (NTM), the Bailey NTMP01 serves dual roles: it terminates the coaxial trunk cable of the INFI-NET ring topology and enables local node attachment via its dual BNC ports. This design supports both primary and secondary network paths, allowing seamless failover in the event of a cable break or node failure—key to maintaining process integrity during unscheduled disturbances. The Bailey NTMP01 operates without requiring configuration, functioning as a passive yet intelligent repeater that regenerates and forwards network traffic while providing real-time status feedback through front-panel LEDs. Its plug-and-play compatibility with all INFI 90 modules makes it indispensable for system expansion, maintenance, and legacy support in facilities where downtime is not an option.

Technical Specifications

Main Features and Advantages

Passive redundancy with automatic failover: The Bailey NTMP01 enables true dual-ring network topology in INFI 90 systems. If a break occurs in the primary coaxial trunk, communication automatically reroutes through the secondary path without controller intervention—ensuring uninterrupted data flow between process units. This self-healing capability is vital in safety-critical applications like boiler protection or reactor control.

Plug-and-play reliability: Unlike active network switches, the Bailey NTMP01 requires no IP addressing, firmware updates, or software configuration. It simply connects to the INFI-NET trunk and local node, making it ideal for rapid deployment or emergency replacement. Its solid-state design with no moving parts contributes to decades-long service life in stable electrical environments.

Real-time diagnostics via LED indicators: Front-panel LEDs on the Bailey NTMP01 provide immediate visual feedback on power status, network traffic, and fault conditions. Maintenance teams can quickly identify cable faults, signal loss, or module failure during routine rounds—reducing mean time to repair (MTTR) in large-scale DCS networks.

Seamless integration with INFI 90 ecosystem: The Bailey NTMP01 is fully compatible with all INFI 90 controllers (e.g., NIS, NPM), I/O modules (e.g., IMM, DIM), and operator consoles. It maintains signal integrity across long cable runs (up to 1,000 feet per segment) and supports up to 64 nodes per network ring, offering scalability for complex process plants.

Legacy support and long-term availability: Despite being part of a mature DCS platform, the Bailey NTMP01 remains in demand due to the vast installed base of INFI 90 systems worldwide. ABB and third-party suppliers continue to offer new surplus, refurbished, and tested units, ensuring operators can sustain operations without costly full-system migration.

Application Field

The Bailey NTMP01 is predominantly deployed in heavy process industries that rely on the Bailey INFI 90 DCS for centralized monitoring and control. In fossil fuel and nuclear power plants, it forms the communication backbone linking turbine governors, boiler management systems, and emissions controls—where network reliability directly impacts grid stability and regulatory compliance. The redundancy features of the Bailey NTMP01 are especially valuable during load-following operations or island mode scenarios, where control latency could trigger protective trips.

In oil refineries and petrochemical complexes, the Bailey NTMP01 interconnects distillation columns, compressors, and flare systems across geographically dispersed units. Its ability to maintain communication during partial network faults prevents cascade shutdowns in hazardous areas. Similarly, in pulp & paper mills, the Bailey NTMP01 supports continuous coordination between digester controls, steam headers, and dryer sections—processes that cannot tolerate unexpected communication loss.

For facilities undergoing phased modernization, the Bailey NTMP01 enables hybrid architectures where legacy INFI 90 segments coexist with newer ABB 800xA systems via gateways. As a non-obsolescent spare, the Bailey NTMP01 also plays a crucial role in life-extension programs, allowing plant engineers to replace failed modules without redesigning the entire control network—preserving decades of operational knowledge embedded in the original system.

Related Products

NTMP02: Enhanced version with improved EMI shielding and updated connector hardware.
NIS (Network Interface Station): Operator workstation interface module that connects to the same INFI-NET ring as the NTMP01.
NPM (Network Processing Module): Central controller module that relies on NTMP01 for network access.
IMM01 / IMM02: Input multiplexer modules that communicate via the INFI-NET network terminated by NTMP01.
FEM01: Fieldbus expansion module used in later INFI 90 configurations, often networked through the same infrastructure.
INFI-NET Coaxial Trunk Cable (RG-58): Required cabling for connecting NTMP01 modules in ring topology.
ABB 800xA System 800F: Modern DCS platform that can integrate with legacy INFI 90 via protocol converters.
NTMD01: Diagnostic terminal module used for network troubleshooting alongside the NTMP01.

Installation and Maintenance

Pre-installation preparation: Before installing the Bailey NTMP01, verify that the INFI-NET coaxial trunk cable is properly terminated with 50 Ω BNC connectors and that the overall ring resistance falls within specification (typically 45–55 Ω end-to-end). Ensure the module carrier backplane is clean and free of oxidation, as the Bailey NTMP01 draws power exclusively through its edge connector. Confirm that adjacent modules are securely seated to avoid intermittent contact. Use a torque-limiting tool when tightening BNC couplings to prevent damage to the Bailey NTMP01’s internal circuitry.

Maintenance recommendations: Although the Bailey NTMP01 contains no user-serviceable components, periodic inspection of its status LEDs can reveal emerging issues—such as flickering yellow (indicating marginal signal strength) or solid red (signifying a hard fault). Clean the module’s ventilation slots with dry, oil-free air during scheduled outages to prevent dust accumulation. When replacing a failed unit, always power down the carrier slot if possible to avoid bus disturbance. Store spare Bailey NTMP01 modules in anti-static packaging at room temperature, away from strong magnetic fields or corrosive atmospheres, to preserve long-term reliability.