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The GE IS200ISBAH1A is an ISBus Daughter Board used primarily within the GE EX2100 Excitation System and the Mark VI Speedtronic Turbine Control System.
Its function is to provide the ISBus communication interface for the core controller module, leveraging the rugged, stackable PC/104 standard for connectivity.
⚙️ Key Function and Role
The IS200ISBAH1A is a small but critical component in high-reliability industrial control systems, serving as the link for synchronous data exchange.
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ISBus Communication: The board is equipped with two ISBus communication channels. The ISBus is a proprietary high-speed protocol used by GE to ensure real-time synchronization and data transfer between different components within a redundant control system, such as the EX2100 or Mark VI.
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Controller Interface: It acts as a replacement board that is physically attached to the ACLI (Application Control Layer Module) or a similar main control PCB. This small board is positioned above a Transition Board in the system rack.
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Synchronization (InSync): The ports on the connected ACLI are often labeled INSYNC A and INSYNC B, highlighting the board’s crucial role in maintaining synchronization across the network, particularly in Triple Modular Redundant (TMR) architectures.
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PC/104 Standard: The board utilizes the PC/104 form factor and bus structure. PC/104 is an embedded computer standard known for its compact size, stackable connectors, and rugged design, making it ideal for the high-vibration and harsh environments of industrial power generation.
🔌 Hardware Features
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Processor: The board includes a total of 17 integrated circuits, including two larger processors dedicated to managing data processing and system control for the ISBus.
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Connectors: It features a PC/104 port, a Header Port, and a P1 pin connector for modular expansion and connection to other system components.
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Indicators: Each communication channel has two status LEDs:
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Green LED: Indicates the board is online and actively communicating.
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Yellow LED (REC): Signals that the board is recording data.
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Design: It is a small PCB with two plastic extenders on the bottom to ensure stability when mounted above the Transition Board. It is manufactured with a conformal PCB coating for added protection.
This video provides an excellent overview of the compact and rugged PC/104 standard, which defines the physical and bus structure of the IS200ISBAH1A board.
