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Product Brief Description
The GE 369B1873G0022 Redundant Digital Input Terminal Board is a component of the GE Mark VIe control system. Unlike its non-redundant counterpart, this terminal board is specifically designed for applications that require a higher level of reliability and fault tolerance. It is also known as a TMR (Triple Modular Redundant) Digital Input Terminal Board, providing 32 channels for monitoring on/off signals. Its primary function is to provide a robust and redundant interface for the control system to receive discrete signals, ensuring that a single component failure does not lead to a loss of control.
Detailed Product Description
The 369B1873G0022 is a critical part of a Triple Modular Redundant (TMR) input configuration in a Mark VIe system. While a standard digital input board connects one I/O pack to a set of field devices, a TMR board is designed to interface with three separate I/O packs. The field wiring from a single device is “fanned out” to all three I/O packs through the terminal board. This allows the system’s three redundant controllers to each receive the same input signal.
The redundancy is handled by the control system’s logic, which typically uses a 2-out-of-3 voting scheme to determine the correct state of the input. This means that if one of the three signals from a single field device differs from the other two, the system will ignore the faulty signal and proceed with the majority vote. This architecture dramatically increases system availability and reliability, which is essential for safety-critical or mission-critical applications.
Key Features and Specifications
- Part Number: 369B1873G0022
- Model Name: TMR Digital Input Terminal Board
- Module Type: Triple Modular Redundant (TMR) Digital Input
- Channels: 32 digital input channels
- Redundancy: Designed for a TMR configuration, supporting three I/O packs for a single set of field inputs.
- Input Type: Accepts discrete on/off signals.
- Primary Function: Provides wiring termination and signal distribution for redundant digital input I/O packs.
- Voting Logic: The system uses 2-out-of-3 voting in the controller to ensure reliability.
- Compatibility: Used with specific Mark VIe digital input I/O packs in a TMR configuration.
Functional Role in a System
In a TMR Mark VIe system, the 369B1873G0022 is a central hub for redundant signals. A single sensor in the field is wired to this board. Internally, the board duplicates the signal and sends it to three separate digital input I/O packs, which are connected to three independent controllers. This design ensures that if one of the I/O packs or controllers fails, the other two can continue to function without interruption, and the system can still make a reliable decision based on the voted signal.
Common Applications
The use of a redundant terminal board like this is reserved for applications where safety and uptime are paramount. These include:
- Emergency Shutdown Systems (ESD): Ensuring that a critical shutdown signal is always received, even if a component in the signal path fails.
- Fire and Gas Detection Systems: Monitoring detectors to prevent false alarms or missed events due to a single point of failure.
- Turbine and Generator Control: Monitoring critical operational states where a loss of control could have severe consequences.
