GE IS200 Series Modules: IS200TREGH1BDC

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The Evolution of IS200 Architecture

The IS200 series was introduced alongside the Mark VI Turbine Control System in the early 1990s as a replacement for the earlier Mark V (IS200 predecessor boards used in the Mark IV/V era, such as the DS200 and DS3800 families). The architecture is built around a VME-based backplane with dedicated I/O termination boards that interface directly to field wiring, isolating the controller cards from transient voltages and ground loops.

Early IS200 revisions (suffix A, B) established the core pinout and signal conditioning standards. Mid-generation revisions (suffix C, D) introduced improved EMI filtering and extended temperature tolerance for outdoor enclosure deployment. Later revisions (suffix E onward) incorporated enhanced surge protection and revised conformal coating specifications for high-humidity environments such as coastal and offshore installations.

The Mark VIe transition (circa 2005–2010) introduced Ethernet-based I/O over the IONet architecture, but the IS200 termination board form factor was retained for backward compatibility. Many IS200 boards are cross-compatible between Mark VI and Mark VIe controller racks, provided firmware and IONET addressing are correctly configured. The series is now in the mature/end-of-life phase; GE (now part of GE Vernova) has ceased active production of most IS200 variants. Long-term maintenance support is the primary use case for IS200 procurement in 2024–2026.

IS200 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed IS200 series modules. Each entry reflects the board's primary functional role within the Mark VI / Mark VIe control architecture.

IS200TREGH1BDC: Termination board for redundant excitation generator control, H-bridge configuration, DC variant — the subject of this listing.
IS200TBAIH1B: Analog input termination board, 16-channel, 4–20 mA / ±10 V, used for process variable acquisition.
IS200TBCIH1B: Thermocouple input termination board, 12-channel, supports J/K/T/E/R/S/B type thermocouples with cold junction compensation.
IS200TSVOH1B: Servo output termination board, 4-channel, ±200 mA servo valve drive with position feedback conditioning.
IS200TRLYH1B: Relay output termination board, 16-channel, Form C dry contact relays, 250 VAC / 30 VDC rated.
IS200VSVOH1B: VME servo output board, interfaces with TSVOH termination, provides closed-loop servo control.
IS200VAICH1B: VME analog input board, 16-channel differential, 16-bit ADC resolution, pairs with TBAIH termination.
IS200VTURH1B: VME turbine control board, primary speed/load control processor for single-shaft gas turbine applications.
IS200EDIOH1B: Enhanced digital I/O board, 24 DI / 16 DO, 24 VDC logic, used for discrete field device interfacing.
IS200EPCTG1A: Ethernet-based process control terminal board, IONet-compatible, used in Mark VIe distributed I/O configurations.
IS200EACFG1A: AC feedback termination board, used for generator stator voltage and current signal conditioning in excitation systems.
IS200EXHSG1A: Excitation hardware signal board, interfaces field current and voltage feedback in EX2100 excitation systems.
IS200TPROH1B: Protection relay output termination board, hardwired trip logic interface, used in turbine protection circuits.
IS200TBCCH1B: Thermocouple cold junction compensation board, auxiliary board for multi-zone temperature measurement systems.
IS200VRTDH1B: VME RTD input board, 12-channel, supports PT100/PT1000 resistance temperature detectors, 3-wire and 4-wire configurations.
IS200TRTDH1B: RTD termination board, field wiring interface for VRTDH, provides terminal block connections and signal filtering.
IS200DSPXH1B: Digital signal processor board, used for high-speed sequence-of-events recording and fast I/O scanning in protection applications.

Quality Control for the IS200 Range

IS200 series boards present specific test challenges due to their multi-layer backplane connectors, high-density VME edge contacts, and mixed analog/digital signal paths. DriveKNMS applies the following test protocol to all IS200 units prior to dispatch:

Visual and mechanical inspection: Full board inspection under 10× magnification for cracked solder joints, damaged edge connectors, corroded terminal blocks, and conformal coating integrity. Boards with compromised coating are rejected or re-coated to IPC-CC-830 standard.
Backplane connector test: All VME P1/P2 connector pins are individually probed for continuity and contact resistance (<50 mΩ per pin). Bent or recessed pins are re-formed or the board is rejected.
Powered functional test: Each board is powered in a GE Mark VI test rack at rated voltage (±15 VDC, +5 VDC, +24 VDC as applicable). Signal channels are exercised with calibrated stimulus signals and outputs verified against GE engineering specifications.
Analog channel calibration verification: For TBAIH, TBCIH, VRTDH, and TRTDH boards, all analog channels are verified for gain accuracy (±0.1% FS), offset error, and common-mode rejection ratio.
Burn-in: Boards are subjected to 48-hour thermal cycling (0°C to 55°C) under load to screen for latent component failures prior to release.