GE IS200WREAH1ABB Module – IS200 Series

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The GE IS200 series constitutes the core I/O, control, and communication hardware platform for GE's Mark VI Turbine Control System and EX2100 Excitation Control System — two of the most widely deployed distributed control architectures in heavy industrial environments. Installed across gas turbine power plants, combined-cycle facilities, nuclear auxiliary systems, petrochemical refineries, and offshore platforms, the IS200 series represents a mature, field-proven hardware generation with an installed base spanning several hundred thousand units globally. Its modular VME-based backplane architecture allows mixed-function configurations within a single controller cabinet, making it the reference standard for turbine protection, excitation regulation, and process I/O in facilities where continuous uptime is non-negotiable.

The Evolution of IS200 Architecture

The IS200 series was introduced in the mid-1990s as the hardware backbone of GE's Mark VI control platform, succeeding the Mark V (IS200 predecessor boards used in TCCA/TCDB racks). The architecture is built around a triple-redundant TMR (Triple Modular Redundancy) topology for critical protection functions, with simplex configurations available for balance-of-plant applications. Early IS200 boards communicated via the IONet (a proprietary 10 Mbps Ethernet derivative); later revisions introduced compatibility with the IONET II and Ethernet-based UCSC/UCSC2 controllers. The series reached end-of-active-production around 2010–2015 as GE transitioned customers toward the Mark VIe platform (IS420 series), which uses a distributed I/O architecture over EGD (Ethernet Global Data) protocol. As of 2026, the IS200 series is in the sustained-support / lifecycle-extension phase: GE Energy no longer manufactures new units, but the installed base remains active in thousands of facilities with 10–20 year remaining operational horizons. Compatibility between IS200 revisions (REV A through REV F on most boards) requires careful cross-referencing of firmware versions and backplane slot assignments before substitution.

IS200 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced IS200 series modules. Each entry reflects the board's primary functional role within a Mark VI or EX2100 control cabinet.

IS200WREAH1ABB: Trip terminal board; interfaces turbine protection relay outputs to the Mark VI TREG/TPRO modules via hardwired trip bus.
IS200TRLYH1B: Turbine protection relay output board; provides 16-channel relay outputs for trip and alarm functions in TMR configurations.
IS200TBAIH1C: Analog input terminal board; 16-channel thermocouple and RTD signal conditioning for turbine temperature monitoring.
IS200TBCIH1C: Contact input terminal board; 24 VDC discrete input acquisition for valve position and limit switch feedback.
IS200TBQCH1C: Speed/frequency input terminal board; processes magnetic pickup and proximity probe signals for turbine speed measurement.
IS200VTURH1B: Turbine control I/O board; integrates speed, temperature, and valve control I/O for single-shaft gas turbine applications.
IS200DSPXH1A: Digital signal processor board; executes real-time turbine protection algorithms within the VCMI controller frame.
IS200VCMIH1C: VME controller module interface board; primary CPU carrier for Mark VI simplex and TMR controller racks.
IS200ECTBH1A: Excitation control terminal board; interfaces EX2100 excitation regulator outputs to generator field and AVR circuits.
IS200EACFH1A: AC feedback input board for EX2100; measures generator terminal voltage and current for excitation regulation loops.
IS200EDCFH1A: DC feedback input board for EX2100; monitors field current and bridge voltage in static excitation systems.
IS200EPCTG1A: Gate pulse control board; generates firing pulses for SCR thyristor bridges in EX2100 excitation systems.
IS200STCIH1A: Steam turbine control I/O board; dedicated analog and discrete I/O for steam admission valve and extraction control.
IS200BICLH1A: Bus interface and clock board; manages IONet communication timing and synchronization across Mark VI controller racks.
IS200AEPCH1B: Analog output and protection coordination board; provides 4–20 mA outputs for valve positioner and actuator control loops.
IS200HFPGH1A: High-frequency pulse generator board; used in combustion dynamics monitoring and flame detector signal processing.
IS200TSVOH1A: Servo valve output board; drives electrohydraulic servo valves for turbine inlet and extraction valve positioning.