GE 369B1873G0022  Redundant Digital Input TB 32CHs

Key Features and Specifications

  • Part Number: 369B1873G0022
  • Module Type: Redundant Digital Input Terminal Board
  • Channels: 32 digital input channels
  • Input Type: Discrete (on/off) signals
  • Redundancy: Specifically designed for dual and triple modular redundant (TMR) configurations.
  • Primary Function: Provides wiring termination and signal routing for redundant discrete input signals.
  • Compatibility: Used with specific Mark VIe Digital Input (IDIS) I/O packs.
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Product Brief Description

The GE 369B1873G0022 Redundant Digital Input Terminal Board is a specialized high-density terminal board designed for critical applications within the GE Mark VIe control system. Its primary function is to provide a termination and voting point for 32 channels of discrete (on/off) digital input signals, specifically optimized for redundant configurations. This board is a key interface that connects field devices like switches and sensors to multiple Digital Input (IDIS) I/O packs, enabling reliable monitoring of vital signals in dual or triple modular redundant (TMR) systems.

Detailed Product Description

The 369B1873G0022 is a crucial component in systems where reliability and signal integrity are paramount. Unlike a simplex board, this redundant terminal board is engineered to accept signals from field devices and route them to multiple I/O packs simultaneously. This “fanning” of a single input signal to multiple packs is essential for a TMR system, where the controller performs 2-out-of-3 voting on the incoming signals to determine the true state. The board’s robust design includes noise suppression and signal conditioning features, protecting the integrity of the digital signals in harsh industrial environments. Its 32-channel capacity is ideal for applications requiring a high number of inputs in a compact footprint.

Key Features and Specifications

  • Part Number: 369B1873G0022
  • Module Type: Redundant Digital Input Terminal Board
  • Channels: 32 digital input channels
  • Input Type: Discrete (on/off) signals
  • Redundancy: Specifically designed for dual and triple modular redundant (TMR) configurations.
  • Primary Function: Provides wiring termination and signal routing for redundant discrete input signals.
  • Compatibility: Used with specific Mark VIe Digital Input (IDIS) I/O packs.

Functional Role in a System

In a redundant Mark VIe system, the 369B1873G0022 serves as a signal splitter. A single field wiring from a sensor is connected to the board, which then “fans” the signal to three separate IDIS I/O packs. Each I/O pack digitizes the signal and sends it to a different controller in the TMR system. The controllers then compare the three versions of the signal and use a voting algorithm (typically 2-out-of-3) to determine the correct state. This process ensures that a single fault in an I/O pack or controller will not lead to an incorrect decision, providing a higher level of reliability for critical applications.

Common Applications

This redundant terminal board is used in applications where system downtime is unacceptable and a single point of failure must be avoided. It is commonly found in:

  • Power Plant Control: Monitoring emergency shutdown systems, critical turbine sensors, and fire and gas detection circuits.
  • Process Automation: Reading the status of safety interlocks and other critical protective functions.
  • High-Availability Systems: Any application requiring continuous operation and high reliability, where the cost of failure is extremely high.