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The GE IS200BLIGH1A is a specialized Printed Circuit Board (PCB) component known as the BIC LAN Interface Board (1BLIG).2 It is manufactured by General Electric for the Mark VI Speedtronic Turbine Control System and its associated Innovation Series Drive applications.3
Its primary function is to serve as the high-speed communication interface for connecting the Bridge Interface Controller (BIC) module to the system’s local area network (LAN).
⚙️ Core Functionality and Features
The BLIG board is critical for enabling fast, reliable data exchange between the main control processor and the power electronics, particularly in redundant or high-performance systems.
- Communication Interface: The board provides the physical and logical layer necessary for network communication, typically supporting a 100 Mbps Ethernet connection. This allows the main control system to send high-speed commands and receive detailed diagnostic and feedback data from the drive components.
- Redundancy Support: In Mark VI systems utilizing redundancy (TMR—Triple Modular Redundancy), the BLIG facilitates the transfer of control and voting data across the turbine control network (often referred to as IONet).
- Signal Isolation: The board includes necessary electrical isolation circuitry to protect the sensitive network components from the electrical noise and transients found in the industrial environment, especially near power electronics.
- Component Type: The IS200BLIGH1A is a VME-style board designed to be installed vertically into a specific slot in the control rack.
- Revision: The H1A suffix specifies the exact hardware and firmware revision, which is vital for network compatibility and proper data handling.
⚠️ Important Considerations for Replacement
- Revision Match is Crucial: The H1A suffix must be matched exactly when sourcing a replacement. Network interface boards are highly sensitive to revision differences, and an incompatible board can lead to communication failures, data integrity issues, and a loss of control over the drive system.
- Slot Restriction: Always adhere to the GE documentation regarding the specific VME rack slot for installation. Incorrect placement can damage the board and the backplane.
- ESD Precautions: Handle the board using strict Electrostatic Discharge (ESD) procedures due to its sensitive electronic components.
