GE IS200 Series Modules: IS200TBAIH1CCC,

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The IS200 series encompasses analog input/output boards, digital I/O termination assemblies, servo control interfaces, communication adapters, power conditioning modules, and specialty signal conditioning boards. Each module interfaces directly with the Mark VI controller rack via a dedicated backplane bus, and field replacement requires no re-engineering of the control logic — making genuine spare parts the only operationally viable path when a board fails.

DriveKNMS maintains sourcing channels for both active and discontinued IS200-series hardware, supporting plant operators who cannot justify a full Mark VIe migration on a compressed timeline.

The Evolution of IS200 Series Architecture

The IS200 series was introduced alongside the GE Mark VI Turbine Control System in the mid-1990s as a modular replacement for the earlier Mark V platform. Where Mark V relied on a more monolithic board architecture, Mark VI separated controller logic from field termination, introducing the IS200-series termination boards as dedicated signal interface layers between field wiring and the control processor.

This separation delivered two operational advantages: field wiring remained permanently landed on termination boards during controller maintenance, and individual signal-type boards could be replaced without disturbing adjacent circuits. The architecture proved durable enough that GE carried it forward into the Mark VIe generation, maintaining backward compatibility for many I/O types while introducing redundant Ethernet-based I/O buses (IONet) alongside the legacy serial backplane.

Plants commissioned in the late 1990s and early 2000s now operate IS200-series hardware that is 20–25 years into its service life. GE's official support posture for original Mark VI hardware has progressively narrowed, with factory repair services and new-manufacture availability for many IS200 part numbers no longer guaranteed. This creates a structural sourcing gap that third-party inventory specialists fill for operators who have determined that system-level migration is not cost-justified within their current capital planning cycle.

The compatibility boundary between Mark VI and Mark VIe is a recurring engineering concern. While GE designed the VIe to accept many IS200-series termination boards, specific revision levels (suffix letters: A, B, C) affect firmware handshake compatibility. Procurement of IS200 spares must account for revision matching, not only part number matching.

IS200 Series Full Catalog & Functionalities (SKU List)

The following represents a cross-section of confirmed IS200-series part numbers organized by functional category. All descriptions reflect the module's primary role within the Mark VI control architecture.

Termination & Signal Interface Boards

• IS200TBAIH1CCC: Analog input termination board; interfaces thermocouple, RTD, and mA signals to the VAIC/VAOC processor cards.
• IS200TBCIH1CCC: Contact input termination board; 24 VDC discrete input signal landing for digital status monitoring.
• IS200TBCOH1CCC: Contact output termination board; relay-driven discrete outputs for trip and control functions.
• IS200TSVOH1BBB: Servo terminal board; interfaces electrohydraulic servo valve command signals for turbine valve control.
• IS200TRLYH1BCC: Relay output termination board; hardwired relay contacts for critical trip circuit integration.
• IS200TBQCH1CCC: Speed/frequency input termination board; magnetic pickup and proximity probe signal conditioning for turbine speed sensing.
• IS200TTURH1CBB: Turbine trip relay termination board; dedicated hardwired interface for emergency trip solenoid circuits.
• IS200TPROH1BCC: Proximity probe termination board; interfaces Bently Nevada-compatible vibration and position probes.
• IS200TBCIH2CCC: Enhanced contact input termination board; higher-density discrete input configuration for expanded I/O requirements.
• IS200TRTDH1CCC: RTD-specific termination board; dedicated 3-wire and 4-wire RTD signal interface for temperature measurement circuits.

Controller & Processor Modules

• IS200VCMIH1BAA: VME communication module; manages inter-controller data exchange across the Mark VI R, S, T redundant controller set.
• IS200VCRCH1BAA: VME controller card; primary CPU module executing turbine control application logic within the Mark VI rack.
• IS200VAICH1BAA: Analog input VME card; processes conditioned analog signals received from IS200-series termination boards.
• IS200VAOAH1BAA: Analog output VME card; generates 4–20 mA command signals to field actuators and positioners.
• IS200VSVOH1BAA: Servo output VME card; drives servo valve commands processed from the TSVOH termination board.

Power & Communication Modules

• IS200EPSMH1ABA: Ethernet power supply module; provides regulated DC power to the Mark VI I/O rack with network status monitoring.
• IS200BICLH1ABA: Backplane interconnect module; manages physical bus routing between VME processor cards and termination board assemblies.

Quality Control for the IS200 Series Range

IS200-series boards present specific failure modes that require targeted inspection protocols beyond standard visual examination: