ALSTOM NRD109475 (8RDA44670G01, SA44670.E) CPBI Eurocard bus interface board, core communication spare hardware for legacy steam turbine governing control racks.

Product Overview

• Part No: NRD109475, 8RDA44670G01, SA44670.E
• Brand: ALSTOM
• Module Mark: CPBI

• Category: Communication Processor Bus Interface ModuleNRD109475 8RDA44670G01 SA44670.E (CPBI) is a standard Eurocard plug-in communication processor interface board within ALSTOM legacy turbine control architecture. Three identifiers correspond to the same hardware assembly: NRD109475 = project part number; 8RDA44670G01 = base PCB part number; SA44670.E = hardware revision code.This module serves as the bus communication gateway inside control racks, responsible for managing bidirectional high-speed data exchange between main processor, local I/O modules and auxiliary control boards via TRENO internal bus. It processes real-time setpoints, valve feedback, protection interlock signals and fault diagnostic data, executes protocol conversion and data buffering. Built-in signal filtering, galvanic isolation and surge suppression guarantee stable communication under severe electromagnetic interference in turbine governing cubicles. It is a discontinued critical maintenance spare widely used for overhaul of thermal power and combined-cycle power plant steam turbine control systems.

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Core Features

• Dedicated CPBI bus gateway for ALSTOM TRENO rack communication architecture
• High-speed bidirectional real-time data transmission between rack controllers and I/O modules
• On-board self-diagnostic circuit with front panel LED status indicators for bus fault detection
• Standard Eurocard draw-out construction supporting fast on-site replacement
• Reinforced multilayer PCB with gold-plated edge connectors for anti-vibration performance
• Integrated ESD and transient overvoltage protection circuits

• Passed EMC, vibration and wide-range thermal cycling reliability qualification

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Technical Specifications

• Operating Supply: 24 VDC
• Operating Temperature: -10°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C
• Form Factor: Standard Eurocard rack plug-in printed circuit board

• Protection Class: IP20 when installed inside control cabinet

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Compatibility & Application

• Compatible with ALSTOM legacy steam turbine governing control racks adopting TRENO internal bus
• Widely deployed in thermal power plants, combined-cycle power stations and captive power facilities
• Responsible for internal rack communication of turbine speed control, valve position regulation and protection interlock systems