GE IS200TRLYH1BGE Relay Output Terminal Board

Technical Dossier

Product Details And Specifications

GE IS200T Series Technical Notes

The GE IS200T series represents a core family of I/O, relay output, power, and communication terminal boards deployed within GE's Mark VI, Mark VIe, and EX2100 turbine and excitation control platforms. These systems are installed across critical heavy-industry infrastructure worldwide — including gas turbine power plants, combined-cycle facilities, nuclear auxiliary systems, petrochemical refineries, and offshore oil and gas platforms. The IS200T series boards interface directly with the VCMI, VTUR, VPRO, and VGEN controller cards via the Mark VI VME backplane, providing the physical I/O termination layer between field instrumentation and the control processor. Their continued operational relevance in aging fleet assets makes them among the most actively sourced spare parts in the global DCS aftermarket.

The Evolution of IS200T Architecture

The IS200T series was introduced alongside GE's Mark VI Turbine Control System in the mid-1990s as a replacement for the earlier Mark V (IS200 predecessor) terminal board architecture. The original Mark V used a separate TMR (Triple Modular Redundant) wiring philosophy with discrete relay panels; the IS200T series consolidated this into a unified terminal board format compatible with the Mark VI VME rack system.

Early IS200T boards (circa 1997–2003) used through-hole component construction with discrete relay arrays and passive termination networks. Mid-generation revisions (2004–2010) introduced surface-mount relay drivers, improved EMI shielding, and revised connector pinouts to support the Mark VIe architecture. Post-2010 variants added compatibility with GE's EX2100e excitation control platform and the LM series aeroderivative turbine controllers.

IS200T Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the IS200T series, organized by functional category. Each model is a discrete terminal board assembly designed for a specific I/O or power function within the Mark VI / EX2100 control rack.

Relay Output Terminal Boards

• IS200TRLYH1BGE: Relay output terminal board, 24-channel, Mark VI TMR/simplex compatible, field-side relay contact closure outputs.
• IS200TRLYH1AGE: Earlier revision of the TRLYH1B; functionally equivalent, minor PCB layout differences, same connector footprint.
• IS200TRLYH2AGE: High-density relay output terminal board, extended channel count variant for applications requiring additional discrete output capacity.

Analog Input Terminal Boards

• IS200TAIAH1AGE: Analog input terminal board, thermocouple and RTD inputs, cold junction compensation integrated, Mark VI VTUR interface.
• IS200TAIAH1BGE: Revised analog input board with improved common-mode rejection ratio; replaces TAIAH1A in later Mark VI builds.
• IS200TBAIH1BGE: Bipolar analog input terminal board, ±10V and 4–20mA input ranges, used in EX2100 excitation feedback loops.

Digital Input Terminal Boards

• IS200TBCIH1BGE: Contact input terminal board, 24VDC wet contact inputs, opto-isolated, Mark VI VCMI interface.
• IS200TBCIH2AGE: Extended contact input board, 48-channel configuration, used in high-density discrete input applications.
• IS200TSVOH1AGE: Servo output and LVDT input terminal board, used for IGV (Inlet Guide Vane) and fuel valve control loops.

Power Supply Terminal Boards

• IS200TPROS1AGE: Power supply terminal board, 28VDC distribution, Mark VI rack power interface.
• IS200TPROS2AGE: Revised power terminal board with additional fusing and surge protection for harsh environment installations.

Communication & Processor Interface Boards

• IS200TCQCH1AGE: Communication terminal board, Ethernet and serial interface, Mark VI VCMI to HMI network bridge.
• IS200TVIBH1BGE: Vibration monitor terminal board, proximity probe inputs (Bently Nevada compatible), used in turbine shaft monitoring.
• IS200TTURH1BGE: Turbine terminal board, speed pickup and flame detector inputs, VTUR card interface.
• IS200TPROH1BGE: Protection terminal board, emergency trip relay outputs and hardwired trip input monitoring, VPRO card interface.
• IS200TGENH1BGE: Generator terminal board, generator protection relay interface, voltage and current transformer inputs, VGEN card interface.

Sourcing Hard-to-Find & Obsolete IS200T Series Parts

For operators running Mark VI systems in long-term maintenance mode — a common scenario in plants with 15–25 years of remaining operational life — we provide board-level availability with full traceability documentation. Each unit is accompanied by a sourcing record indicating origin, inspection date, and test results. We support both single-unit emergency replacement orders and bulk procurement for scheduled outage kitting.

Models with confirmed availability include IS200TRLYH1BGE, IS200TAIAH1BGE, IS200TBCIH1BGE, IS200TSVOH1AGE, IS200TPROH1BGE, and IS200TGENH1BGE. Inquiries for unlisted models are accepted — our team will conduct a targeted search within 24 hours of request receipt.

Quality Control for the IS200T Range

IS200T series terminal boards present specific test challenges due to their relay array architecture, passive termination networks, and multi-connector backplane interfaces. DriveKNMS applies a structured inspection and functional test protocol to each unit processed:

• Visual Inspection: Full PCB examination under magnification for relay contact corrosion, capacitor bulge, solder joint cracking, and connector pin damage. Boards with evidence of arc damage at relay contacts are rejected.
• Relay Functional Test: Each relay channel is individually actuated and contact continuity verified using a dedicated relay test fixture. Contact resistance is measured and compared against OEM specifications (typically <100mΩ for new contacts).
• Connector Integrity Check: All field-side and backplane connectors are inspected for bent pins, contamination, and retention force. Connectors failing retention force specification are replaced.
• Insulation Resistance Test: Hi-pot testing applied between relay coil circuits and contact circuits to verify isolation integrity per IEC 61010 requirements.
• Functional Burn-In: Boards are powered and cycled through relay actuation sequences for a minimum of 4 hours prior to release, identifying latent failures not detectable by static inspection.