GE IS200 Series Modules: IS200EDCFG1B I/O Terminal Board

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The Evolution of IS200 Architecture

The IS200 module family was introduced alongside the Mark VI Turbine Control System in the mid-1990s, replacing the earlier Mark V (IS200 predecessor boards used in the Mark IV/V era). The Mark VI platform standardized on VME-based backplane architecture with dedicated I/O terminal boards, communication adapters, and processor cards operating under GE's proprietary UCSC (Unit Control System Controller) framework. Early IS200 modules used parallel backplane communication; later revisions introduced high-speed serial backplane (HSRB) compatibility for Mark VIe migration paths.

By the 2000s, GE introduced the Mark VIe platform, which retained backward-compatible IS200 I/O terminal boards (such as the IS200EDCFG1B) while transitioning controller and communication layers to Ethernet-based I/O packs (IONet). This hybrid architecture means many plants running Mark VIe controllers still rely on IS200-series terminal boards for field wiring termination. As of 2026, the IS200 series is in its mature/end-of-life phase — GE no longer manufactures most IS200 modules as new production. Long-term maintenance support, spare parts sourcing, and refurbished module supply have become the primary procurement channels for operators committed to extending Mark VI/VIe system lifecycles beyond OEM support windows.

IS200 Full Catalog & Functionalities (SKU List)

The following IS200 series modules are classified by functional category. Each SKU represents a verified, commonly deployed component within Mark VI or Mark VIe turbine control architectures.

I/O Terminal Boards

• IS200EDCFG1B: Excitation DC feedback terminal board for generator excitation control loops
• IS200TRLYH1B: Relay output terminal board, 16-channel, used for trip and alarm relay interfacing
• IS200TBAIH1C: Analog input terminal board, 16-channel, 4–20 mA / thermocouple compatible
• IS200TBCIH1C: Contact input terminal board, 24 VDC discrete input, 24-channel field termination
• IS200TBQCH1C: Speed/frequency input terminal board for magnetic pickup and proximity probe signals
• IS200TSVOH1B: Servo output terminal board for electrohydraulic valve actuator control
• IS200VRTDH1C: RTD/thermocouple input terminal board, 12-channel, Pt100 and Type K/J/T compatible
• IS200ECTBG1A: Excitation control terminal board for static excitation systems (EX2100 interface)
• IS200TRPGH1B: Protective relay interface terminal board for generator protection schemes
• IS200TBCCH1C: Contact closure output terminal board, 24-channel, 24 VDC dry contact

Controller & Processor Modules

• IS200UCVEH2A: Mark VI UCVE controller card, primary turbine control processor with dual redundancy support
• IS200UCVGH2A: Mark VI UCVG controller, enhanced processing for combined-cycle applications
• IS200DSPXH1B: Digital signal processor expansion card for high-speed control loop execution

Communication & Network Adapters

• IS200ENEGH2A: Ethernet network interface card for Mark VI IONet and HMI communication
• IS200SRLYH1B: Serial relay communication adapter for legacy MODBUS/RS-485 field device integration
• IS200STCIH1B: Serial communication interface board for Mark VI inter-controller data exchange

Power Supply Modules

• IS200EPCTG1A: Excitation power conversion terminal board, DC bus interface for EX2100 excitation systems
• IS200PSCDH1A: 28 VDC power supply distribution board for Mark VI I/O panel rail power

Sourcing Hard-to-Find & Obsolete IS200 Parts

Q: Can you support multi-unit or repeat RFQ requests?
A: Yes. Send the model list, target quantity and destination so DRIVEKNMS can review sourcing options and quote the requirement as a project RFQ.

Quality Control for the IS200 Range

IS200 series modules present specific testing challenges due to their backplane-dependent operation and proprietary GE communication protocols. DriveKNMS applies the following QC procedures to all IS200 inventory: