GE IS200 Series Modules

Technical Dossier

Product Details And Specifications

GE IS200 Series: Comprehensive Module Range and Technical Overview

The GE IS200 series constitutes the core I/O, control, and communication module family deployed within GE's Mark VI and Mark VIe Turbine Control Systems. These systems are installed across critical global infrastructure including gas turbine power plants, combined-cycle facilities, nuclear auxiliary systems, petrochemical refineries, and offshore oil & gas platforms. The IS200 platform is recognized as one of the most widely deployed turbine control architectures in heavy industry, with an installed base spanning North America, Europe, the Middle East, and Asia-Pacific. Its modular backplane architecture allows for granular replacement of individual I/O cards without full system shutdown, making spare parts availability a primary operational concern for plant maintenance engineers and reliability teams.

The Evolution of IS200 Architecture

The IS200 series was introduced as part of GE's transition from the earlier Mark V platform (TMR-based, relay logic) to the fully digital, triple-modular redundant (TMR) Mark VI architecture in the mid-1990s. Early IS200 modules operated on the IONET and ARCNET communication backbones. As the platform matured into the Mark VIe generation (introduced circa 2005), GE migrated the communication layer to Ethernet-based IONet, introducing a new generation of IS200 cards with enhanced diagnostics and firmware revision compatibility requirements.

Key architectural transitions:

• Mark VI (1990s–2000s): Original IS200 cards, IONET backplane, VME-style form factor, firmware managed via Toolbox software.
• Mark VIe (2005–present): Revised IS200/IS215 hybrid catalog, Ethernet IONet, expanded I/O density, backward compatibility limited by firmware and I/O pack pairing.
• EX2100 / EX2100e: Excitation control systems sharing IS200-series boards for generator field control applications.

Compatibility between Mark VI and Mark VIe IS200 modules is not universal. Slot assignment, firmware revision, and I/O pack pairing must be verified before substitution. Plants operating legacy Mark VI systems face increasing obsolescence risk as GE has transitioned support focus to Mark VIe and Mark VIe-m platforms.

IS200 Full Catalog & Functionalities (SKU List)

The following IS200 series modules are classified by functional category. All models listed are verified components within the GE Mark VI / Mark VIe / EX2100 control ecosystem.

RTD / Thermocouple Input Modules

• IS200SRTDH2A: RTD input terminal board; interfaces resistance temperature detectors to the Mark VI control system via the SRLY or STCI I/O pack.
• IS200STCIH2A: Thermocouple input terminal board; supports J, K, T, E, R, S, B type thermocouples for turbine exhaust temperature monitoring.
• IS200ERTDH1A: Enhanced RTD input board; used in EX2100 excitation systems for field temperature sensing.

Analog Input / Output Modules

• IS200SAICH1D: Analog input terminal board; 16-channel, 4–20 mA / 0–10 V process signal acquisition.
• IS200SAOCH1C: Analog output terminal board; 8-channel analog output for valve positioner and actuator control.
• IS200EAIAH1A: Analog input board for EX2100 excitation; field current and voltage measurement.

Digital Input Modules

• IS200SDCIH1D: DC digital input terminal board; 24 VDC discrete inputs for contact sensing and limit switch monitoring.
• IS200SDIOH1D: Digital I/O combination board; mixed discrete input/output for auxiliary control logic.
• IS200EDCSH1A: DC digital input board for EX2100; monitors field breaker and protection relay status.

Digital Output / Relay Modules

• IS200SRLYH2A: Relay output terminal board; 16-channel dry contact relay outputs for trip and alarm annunciation.
• IS200SSVOH1B: Servo output terminal board; interfaces electrohydraulic servo valves for fuel and inlet guide vane control.
• IS200ESVOH1A: Servo output board for EX2100 field flashing and excitation forcing circuits.

Speed / Pulse Input Modules

• IS200SPROH1A: Proximity probe input terminal board; interfaces Bently Nevada-compatible speed and vibration probes.
• IS200SHEPIH1A: High-energy pulse input board; turbine speed sensing via magnetic pickup units (MPU).

Power Supply Modules

• IS200EPSMH1A: Power supply module for EX2100 excitation control cabinet; 125 VDC input, regulated DC output rails.
• IS200PSCDH1A: DC power conditioning board; filters and distributes control power within Mark VI I/O racks.

Communication / Processor Modules

• IS200DSPXH1A: Digital signal processor board; executes turbine protection and sequencing algorithms within the Mark VI R controller.
• IS200IOCIH2A: I/O communication interface board; bridges I/O packs to the IONET/Ethernet IONet backbone.

Sourcing Hard-to-Find & Obsolete IS200 Parts

GE has formally discontinued active manufacturing support for the majority of original Mark VI IS200 series modules. Plants operating these systems beyond their original design life — commonly 20–30 years in baseload power generation — face a secondary market dependency for spare parts procurement. DriveKNMS maintains a dedicated inventory of IS200 series modules sourced through controlled decommissioning projects, OEM surplus channels, and verified third-party refurbishers.

DriveKNMS provides lifecycle extension support including: cross-reference identification for superseded part numbers, firmware revision documentation, and compatibility verification between I/O terminal boards and their associated I/O packs. For plants transitioning from Mark VI to Mark VIe, DriveKNMS can supply both legacy and current-generation IS200/IS215 modules to support phased migration without full system replacement.

All obsolete IS200 modules are sourced with full traceability documentation and are available for immediate dispatch to minimize unplanned outage duration.

Quality Control for the IS200 Range

IS200 series modules present specific testing challenges due to their backplane-dependent communication architecture and TMR voting logic. DriveKNMS applies the following verification procedures to all IS200 inventory:

• Visual and physical inspection: PCB trace integrity, connector pin condition, capacitor health assessment, conformal coating evaluation.
• Powered functional test: Each module is energized within a compatible Mark VI or EX2100 test rack. Communication handshake with the IONet backbone is verified. I/O channel response is tested against calibrated signal sources.
• Firmware revision verification: Firmware version is read and documented. Modules with incompatible firmware for the target application are flagged prior to shipment.
• RTD/Thermocouple-specific testing (IS200SRTDH2A and related): Each RTD input channel is tested with a precision decade resistance box across the full Pt100 range (0–400 Ω). Linearity, offset, and channel isolation are verified.
• Burn-in cycle: Modules are subjected to a minimum 24-hour powered burn-in to screen for early-life component failures.

For IS200 series spare parts inquiries, cross-reference requests, or emergency procurement support:

• Email: [email protected]
• WhatsApp: +86 18359293191
• Web: driveknms.com