GE DS200 Series Modules – DS200FSAAG2ABA Gate Firing Board

Technical Dossier

Product Details And Specifications

GE DS200 Series Technical Notes

The GE DS200 series constitutes the core I/O, control, and power distribution layer of the GE Mark V and Mark VI turbine control systems — the dominant DCS platform deployed across gas turbine, steam turbine, and combined-cycle power generation facilities worldwide. Installations span petrochemical complexes, nuclear auxiliary systems, offshore platforms, and large-scale refineries across North America, Europe, the Middle East, and Asia-Pacific. The DS200 designation covers a broad family of printed circuit boards engineered for deterministic real-time control, high-noise-immunity backplane communication, and extended service life in Class I Division 2 environments. Due to the 20–40 year operational lifespan of turbine assets, DS200 modules remain in active demand long after GE's official production end-of-life announcements.

The Evolution of DS200 Architecture

The DS200 platform was introduced as part of the Mark V control system in the late 1980s, replacing the earlier Mark IV relay-logic architecture with a fully digital, triple-redundant TMR (Triple Modular Redundancy) control structure. Early DS200 boards used through-hole component technology with EPROM-based firmware, requiring physical chip replacement for logic updates. Mid-generation revisions introduced surface-mount components, EEPROM configuration storage, and enhanced EMI shielding to address field reliability issues in high-voltage switchgear environments.

The transition from Mark V to Mark VI (circa 2000–2005) introduced the IONET and ARCNET communication backbones, replacing the earlier proprietary serial bus. Many DS200 boards were redesigned with IS200 or IS215 designations for Mark VI compatibility, though a significant installed base of Mark V systems continues to operate on original DS200 hardware. Cross-compatibility between DS200 and IS200 variants is board-specific and must be verified against the GE Mark V/VI Application Manual (GEH-6421). Firmware version mismatches between processor boards and I/O boards are a documented failure mode during unplanned replacements.

DS200 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced DS200 series modules. Each entry reflects the board's primary functional role within the Mark V/VI control architecture.

Gate Firing & Power Conversion Boards

• DS200FSAAG2ABA: Gate Firing Board — generates PWM gate drive signals for IGBT/SCR power bridge firing sequences in excitation and static starter applications.
• DS200FSAAG1ABA: Gate Firing Board Rev 1 — earlier hardware revision of the FSAA family; functionally equivalent with minor component-level differences.
• DS200GDDAG1ABA: Gate Driver Board — interfaces between the firing board and the physical gate drive circuits on the power converter stack.

Analog I/O Modules

• DS200IIBDG1ABA: Analog Input Board — 16-channel differential analog input module, 4–20 mA and ±10 V ranges, used for process variable acquisition.
• DS200AIBDG1ABA: Analog Input Board — high-density analog input module for thermocouple and RTD signal conditioning.
• DS200AOBDG1ABA: Analog Output Board — 8-channel analog output module, 4–20 mA, for valve positioner and actuator control loops.

Digital I/O Modules

• DS200DIBBG1ABA: Digital Input Board — 32-channel 24 VDC discrete input module for contact closure and proximity switch monitoring.
• DS200DOEAG1ABA: Digital Output Board — 16-channel relay output module, rated for 120/240 VAC switching in alarm and trip circuits.
• DS200DTBCG1ABA: Digital Terminal Board — field wiring termination board for DI/DO signal marshalling.

Processor & CPU Boards

• DS200TCQAG1ABA: Turbine Control Processor — primary CPU board for Mark V R, S, T control cores; executes control application and manages I/O bus arbitration.
• DS200TCQCG1ABA: Turbine Control Processor Rev C — enhanced clock speed variant with expanded diagnostic memory buffer.
• DS200TCEAG1ABA: Turbine Control Executive Board — coordinates inter-processor communication in TMR configurations.

Communication & Network Adapters

• DS200SLCCG1ABA: Serial Link Communication Board — manages ARCNET node communication between Mark V control cores and HMI workstations.
• DS200EXPSG1ABA: Expander Power Supply Board — provides regulated DC bus power to I/O expander racks in distributed Mark V configurations.

Power Supply Modules

• DS200PSAAG1ABA: Power Supply Board — primary 28 VDC regulated supply for DS200 I/O rack; input range 120/240 VAC.
• DS200PCCAG1ABA: Power Conditioning Board — filters and conditions incoming AC supply to suppress transient interference in high-noise plant environments.

Sourcing Hard-to-Find & Obsolete DS200 Parts

GE formally discontinued production of the majority of DS200 series boards between 2008 and 2015, coinciding with the broader transition to the Mark VIe platform. However, the installed base of Mark V systems in power generation and petrochemical facilities remains substantial, with many operators extending asset life through 2030 and beyond under long-term service agreements.

Quality Control for the DS200 Range

DS200 series boards present specific test challenges due to their multi-layer backplane bus architecture, EPROM/EEPROM firmware dependencies, and mixed analog-digital signal paths. DriveKNMS applies a structured test protocol for each board type prior to shipment.

Gate firing boards (FSAA family) are tested under simulated load conditions using a dedicated firing circuit test rig that replicates the impedance profile of a standard IGBT bridge. PWM output timing, dead-band intervals, and fault latch behavior are verified against GE specification sheets. Analog I/O boards undergo full-channel calibration using traceable reference standards, with linearity and offset error documented per channel. Digital I/O boards are cycled through full contact closure and relay actuation sequences under rated voltage. Processor boards are powered in a Mark V-compatible rack with known-good I/O boards to verify boot sequence completion, IONET/ARCNET node registration, and diagnostic self-test pass status. All boards are inspected for capacitor ESR degradation, solder joint integrity, and corrosion on edge connectors prior to functional test entry.