GE DS200RTBAG1AHC Module – DS200 Series

Technical Dossier

Product Details And Specifications

GE DS200 Series Technical Notes

The Evolution of DS200 Architecture

The DS200 series was introduced alongside GE's Mark V Turbine Control System in the early 1990s as a standardized terminal board platform. The architecture is built around a passive backplane with direct wiring termination, allowing field cables to land on the board and route signals to the Mark V TCCA, TCDB, and TCEA core processor cards via ribbon or direct connector interfaces.

With the transition to Mark VI in the late 1990s and early 2000s, GE retained the DS200 board form factor for many I/O functions, integrating them into the Mark VI I/O pack architecture (VPRO, TREG, TTUR packs). This backward-compatible design decision extended the operational lifespan of DS200 hardware significantly. However, GE's subsequent shift to the Mark VIe platform — based on Ethernet-distributed I/O and the IS200 series boards — rendered the DS200 family a legacy product line. GE ceased active manufacturing of most DS200 variants by the mid-2010s. No direct OEM replacement path exists; system upgrades to Mark VIe require full engineering re-termination projects costing upward of $500,000 per unit train. For the majority of plant operators, maintaining DS200 spares inventory is the only economically rational strategy.

DS200 Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed, commonly deployed DS200 series boards. Each entry reflects a distinct functional role within the Mark V/VI control architecture.

Relay Output & Terminal Boards

• DS200RTBAG1AHC: Relay terminal board, Mark V relay output interface, field wiring termination for discrete relay circuits
• DS200RTBAG1AAA: Relay terminal board variant, alternate firmware/hardware revision for Mark V relay marshalling
• DS200RTBCG1AAA: Relay terminal board C-variant, used in Mark VI relay output I/O pack configurations
• DS200TBQGG1ABB: Terminal board for Q-type I/O, signal conditioning and marshalling for analog/discrete mixed signals
• DS200TBCAG1AAA: Terminal board C-type analog, interfaces analog field signals to Mark V TCCA processor
• DS200TCCAG1BAA: Thermocouple terminal board, cold junction compensation, Type K/J/T thermocouple input conditioning

Analog Input Boards

• DS200AIBAG1ADB: Analog input board, 16-channel 4–20 mA / voltage input, Mark V TCCA interface
• DS200AIBAG1AEB: Analog input board revision E, enhanced noise immunity for high-EMI turbine environments
• DS200AIDAG1A: Analog input daughter board, auxiliary channel expansion for primary AI boards

Discrete I/O Boards

• DS200DIBBG1BAA: Discrete input board B-variant, 24 VDC/125 VDC field contact input, Mark V DI marshalling
• DS200DOEAG1ADB: Discrete output board, 24 VDC sourcing output, Mark V/VI DO interface
• DS200DSPAG1ADB: Digital signal processor board, high-speed pulse input for speed/frequency measurement

Communication & Processor-Adjacent Boards

• DS200SDCCG1ADB: Serial data communication card, RS-422/RS-485 interface for Mark V inter-panel communication
• DS200EXPSG1ADB: Expansion board, I/O channel extension for large Mark V configurations
• DS200PCCAG1BAA: Power conditioning and communication auxiliary board, panel bus interface

Power Supply Interface Boards

• DS200PSDAG1ADB: Power supply distribution board, 28 VDC regulated output distribution to I/O boards
• DS200PSMAG1ADB: Power supply monitor board, voltage/current supervision for Mark V panel power rails

Sourcing Hard-to-Find & Obsolete DS200 Parts

DriveKNMS maintains a dedicated inventory of DS200 series boards sourced from decommissioned Mark V/VI panels, controlled plant shutdowns, and verified surplus channels. Each unit entering our inventory is logged by part number, hardware revision, and physical condition before any evaluation begins. We do not list boards we cannot physically inspect.

Quality Control for the DS200 Range

DS200 boards present specific failure modes that require targeted inspection protocols. Our QC process for this series addresses the following known degradation patterns:

1. Electrolytic capacitor aging: DS200 boards manufactured in the 1990s use aluminum electrolytic capacitors with a rated service life of 10–15 years. All boards undergo capacitor ESR (Equivalent Series Resistance) measurement. Units with out-of-spec capacitors are recapped with equivalent-rated components before release.
2. Relay contact wear (RTBA variants): Relay terminal boards are subjected to contact resistance measurement across all relay outputs. Contacts exceeding 100 mΩ are flagged; boards with worn relay assemblies are either re-relayed or downgraded.
3. Connector pin inspection: All edge connectors and ribbon cable interfaces are inspected under magnification for corrosion, fretting wear, and bent pins. Pin-to-pin resistance is verified against reference values.
4. Firmware/hardware revision verification: Board revision markings are cross-referenced against GE's DS200 revision matrix to confirm compatibility with the target Mark V/VI software version. Mismatched revisions are a common source of field installation failures.
5. Functional bench test: Where test fixtures are available, boards are powered and exercised through their I/O channels using a controlled signal source. Pass/fail results are documented and accompany the shipment.