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The GE IS200CTBCG1AAA is an I/O Terminal Board manufactured by General Electric (GE) for the Mark VI Speedtronic Turbine Control System, particularly as a component within the associated Innovation Series Drive subseries.
It is a specialized interface board with the functional acronym CTBC. The trailing letters ‘AAA’ signify the specific revision and artwork configuration of the board.
⚙️ Core Function and Design
The IS200CTBCG1AAA serves as the crucial physical and electrical interface between the control system’s internal electronics and the external field wiring from the turbine’s sensors and actuators.
- Customer Wiring Termination: It is the primary connection point where customer wiring (wires from field devices) is terminated via screw-in terminal strips. This simplifies installation and maintenance.
- Signal Routing and Protection: The board’s simple design, with minimal active circuitry, ensures reliability. Its main components are filters and protective devices (like surge suppressors) that shield the sensitive I/O control modules from high-frequency noise and voltage transients originating in the field.
- Physical Connection: The board typically features:
- Two terminal strips on one side for field wiring.
- A single D-shell connector (like a DC-37 pin) on the opposite side.
- Integration: The D-shell connector allows for the attachment of a ribbon cable that connects the terminal board to the corresponding I/O pack/module inside the Mark VI control rack.
💡 System Context
The IS200CTBCG1AAA is generally described as a relatively simplistic Mark VI terminal board, designed for robust functionality with a focus on signal integrity and protection. Its small dimensions sometimes lead to it being referred to as an “I/O Terminal Card.” It is one of many specialized terminal boards used across the Mark VI system, each specifically designed to handle a certain type of I/O signal (e.g., analog, discrete contact, or thermocouple).
