GE IS200ISBBG2AAB InSync Bus Bypass Board

IS200ISBBG2AAB (ISBB) is an InSync Bus bypass printed circuit board developed by General Electric, exclusively matched with Mark VI Speedtronic turbine control racks and EX2100 generator excitation systems. Equipped with dual independent ISBus fiber optical communication channels, it serves as a critical bus switching and bypass unit to maintain uninterrupted inter-board data transmission during single module hot-swap maintenance. It realizes seamless signal routing between the main control core, I/O packs and excitation power cells for gas/steam turbine closed-loop control.

This 3U single-slot rack board adopts industrial anti-vibration PCB coating and built-in bus fault diagnosis logic. It operates on 24VDC rack backplane power with low power consumption, supporting redundant bus transmission architecture. GE has discontinued original production, and it is globally supplied as core maintenance spare parts for thermal power, combined cycle and petrochemical turbomachinery control cabinets.

Main Specifications

• Brand: General Electric (GE); Model: IS200ISBBG2AAB; Functional Code: ISBB; Series: Mark VI / EX2100
• Form Factor: Standard single 3U rack plug-in module, high-density backplane gold connector
• Communication Interface: 2-channel ISBus fiber optic transceivers for high-speed deterministic bus data
• Power Input: 24VDC from rack backplane, total power consumption ≤1W, redundant power compatible
• Physical Size: 187mm × 260mm × 20mm; Net weight approx 0.5kg
• Operating Temperature: -20℃ ~ +65℃; Humidity: 5%~95% non-condensing industrial cabinet grade
• Diagnostic Design: Onboard signal detection circuit, linked to rack system fault alarm logic
• Bus Function: Hardware bus bypass switching, hot-swap isolation without turbine system shutdown
• Lifecycle Status: Factory discontinued, only aftermarket overhaul spare parts available
• Compatible Matching: DS200ACLEH1 communication board, full Mark VI turbine control rack series

Core Functions

• Act as the dedicated switching unit of the Mark VI InSync fiber bus, realizing bidirectional real-time data transmission between main CPU, I/O packs and EX2100 excitation power units.
• Hardware bus bypass circuit isolates faulty or replaced modules automatically during hot-swap maintenance, ensuring the whole turbine control system keeps continuous operation without trip protection.
• Dual fiber optical channels provide redundant bus transmission, automatically switching to standby channel when one fiber link breaks to avoid loss of turbine speed, vibration and temperature data.
• Built-in bus signal monitoring logic detects fiber disconnection, communication frame loss and internal chip failure, uploading fault codes to upper CIMPLICITY SCADA monitoring platform.
• High-isolation fiber interface separates high-voltage excitation cell power circuit from low-voltage control logic, eliminating electromagnetic interference and surge damage risks to core control boards.
• Standard plug-in rack design supports independent single board replacement, cutting power plant unit maintenance downtime and reducing forced outage loss of power generation equipment.

Application Scenarios

• Spare bus bypass board replacement for GE Mark VI gas turbine and steam turbine control racks in thermal power and combined cycle power plants.
• Core communication spare parts for EX2100 generator excitation control cabinets of hydropower station synchronous generator units.
• Maintenance backup stock for large centrifugal compressor and heavy blower turbomachinery control systems in petrochemical refineries.
• Matching bus interface component for DS200ACLEH1 Mark V/VI communication gateway and full-set turbine monitoring control racks.
• Retrofit overhaul spare parts for vintage GE Speedtronic control platforms equipped with ISBus fiber communication architecture worldwide.
• Long-term spare inventory for energy heavy industry maintenance workshops servicing discontinued GE Mark VI excitation and turbine control hardware.