GE IS200VAICH1CBA: Mark VI / Mark VIe VAI Analog Input Circuit Board

Technical Dossier

Product Details And Specifications

GE IS200 Series (Mark VI / Mark VIe) Technical Notes

The GE IS200 series represents the core I/O and control module family deployed within GE's Mark VI and Mark VIe Turbine Control Systems. These platforms are the industry standard for gas turbine, steam turbine, and combined-cycle power plant automation, with documented installations across petrochemical complexes, nuclear auxiliary systems, LNG terminals, and offshore platforms globally. The IS200 series modules operate on a triple-redundant (TMR) or simplex architecture, communicating over the IONet and ARCNET backplane buses. The IS200VAICH1CBA is a VAI-type analog input board, responsible for conditioning and digitizing analog field signals (4–20 mA, thermocouple, RTD) before transmission to the Mark VI controller core.

The Evolution of IS200 Architecture

The IS200 module family was introduced alongside the Mark VI platform in the mid-1990s as GE Power's successor to the Mark V (IS200 predecessor boards used the ARCNET bus). The original Mark VI simplex and TMR configurations used first-generation IS200 boards with the H1 hardware revision suffix (e.g., IS200VAICH1A, IS200VAICH1B, IS200VAICH1C). As the platform matured into the Mark VIe (Ethernet-based IONet), GE introduced updated board revisions with enhanced EMI shielding and extended temperature tolerance. Compatibility between hardware revisions is constrained by firmware version and I/O pack pairing — substituting an H1B for an H1C board requires verification of the associated VCMI or VTUR firmware baseline. The entire IS200 series entered the mature/end-of-active-production phase circa 2015–2018, with GE transitioning customers toward the Mark VIe distributed I/O architecture. However, the installed base remains extensive, and long-term maintenance support for IS200 modules is a critical operational requirement for plants with 20–30 year turbine lifecycles.

IS200 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the GE IS200 / Mark VI / Mark VIe ecosystem, organized by functional category:

Analog Input Modules

• IS200VAICH1CBB: VAI analog input board, 16-channel, H1C revision B — field signal conditioning for 4–20 mA and thermocouple inputs.
• IS200VAICH1CBA: VAI analog input board, 16-channel, H1C revision A — primary analog input module for Mark VI TMR and simplex configurations.
• IS200VAICH1AAA: VAI analog input board, H1A first-generation revision — legacy variant for early Mark VI installations.
• IS200VAOCH1C: VAO analog output board — 8-channel analog output, 4–20 mA, for actuator and valve positioner control loops.

Digital I/O Modules

• IS200VDICH1C: VDI digital input board — 24 VDC discrete input module, 24-channel, for contact and proximity sensor interfacing.
• IS200VDOCH1C: VDO digital output board — 24 VDC discrete output, relay-driven, for solenoid and alarm annunciator control.
• IS200VDICH1B: VDI digital input board, H1B revision — earlier production variant, compatible with Mark VI simplex racks.

Controller & Processor Modules

• IS200VCMIH2C: VCMI VME controller module — primary Mark VI controller card, manages I/O pack communication and control execution.
• IS200VCMIH2B: VCMI VME controller module, H2B revision — predecessor to H2C, used in earlier Mark VI TMR frames.
• IS200VTCCH2C: VTCC turbine control communications card — handles IONet Ethernet communication in Mark VIe architecture.

Speed & Vibration Modules

• IS200VSPAH1C: VSPA speed and acceleration input board — processes magnetic pickup and proximity probe signals for turbine speed control.
• IS200VTURH2C: VTUR turbine control board — integrates speed, temperature, and pressure inputs for turbine protection logic.
• IS200VTURH2B: VTUR turbine control board, H2B revision — legacy variant for Mark VI simplex and TMR frames.

Power Supply Modules

• IS200EPCTG1A: EPC power supply board — provides regulated DC power to IS200 I/O racks; critical for rack stability.
• IS200EPCTG2A: EPC power supply board, G2A revision — updated power regulation circuit for extended thermal performance.

Communication & Termination Modules

• IS200ECTBG1A: ECT terminal board — field wiring termination board for analog and digital I/O packs in Mark VIe distributed architecture.
• IS200TRLYH1C: TRLY relay output terminal board — provides relay-isolated discrete outputs for critical trip and alarm circuits.