Product Overview

• Part No: NRD108034, 8RDB44674G01, SA44674.C
• Brand: ALSTOM

• Category: Digital Input & Output Interface ModuleNRD108034 8RDB44674G01 SA44674.C is a standard Eurocard plug-in printed circuit board within ALSTOM legacy turbine control architecture. It functions as a digital I/O interface for collecting binary status signals from field equipment and outputting logic control commands. The module transmits interlock signals, valve feedback status, fault alarms and trip signals between the backplane bus and on-site actuators, sensors and auxiliary protection devices. Built-in signal filtering, surge suppression and channel isolation circuits guarantee reliable operation under heavy electromagnetic interference inside power plant control cubicles. It is an obsolete original spare widely used for maintenance and overhaul of thermal power turbine monitoring and governing control systems.

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Core Features

• Multi-channel digital signal acquisition and logic command output for field equipment
• Galvanic channel isolation to reduce signal interference and prevent cross-circuit impact
• Front panel LED indicators for channel status and module fault diagnosis
• Standard Eurocard draw-out design supporting rapid on-site replacement
• Stable backplane bus connection for real-time data exchange with master controllers
• Reinforced multilayer PCB with ESD and transient overvoltage protection

• 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 PCB

• Protection Class: IP20 when installed inside control cabinet

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Compatibility & Application

• Compatible with ALSTOM legacy steam turbine governing and distributed control platforms
• Widely deployed in thermal power plants, combined-cycle power stations and captive power facilities
• Applied for turbine interlock signal transmission, auxiliary equipment status collection and protection logic output