GE IS200 Series Modules: IS200TSVCH2AJE Servo Termination Board

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The Evolution of IS200 Architecture

The IS200 module family was introduced alongside GE's Mark VI turbine control system in the mid-1990s, replacing the earlier Mark V (IS200 predecessor boards such as the DS200 series). The architecture is built around a VME-based backplane with high-speed serial communication between controller boards (VCMI, VCRC) and I/O termination boards. Early IS200 modules used discrete analog signal conditioning; later revisions incorporated surface-mount ASIC-based signal processing for improved noise immunity in high-EMI environments.

With the introduction of the Mark VIe platform (circa 2005–2010), GE transitioned toward Ethernet-based I/O (EtherCAT/IONet) while maintaining backward-compatible IS200 termination hardware for installed-base continuity. Many IS200 boards remain in active service on Mark VI systems with no planned migration, making long-term spare parts availability a critical operational concern. The IS200TSVCH2AJE specifically interfaces servo-hydraulic actuators (electrohydraulic servo valves, EHSVs) to the Mark VI VSVO servo controller board, providing signal conditioning, feedback scaling, and protective relay outputs for turbine fuel and inlet guide vane (IGV) control loops.

IS200 Full Catalog & Functionalities (SKU List)

Servo & Actuator Termination Boards

• IS200TSVCH2AJE: Servo termination board; interfaces EHSVs to VSVO; includes LVDT feedback conditioning and relay outputs for turbine servo control loops.
• IS200TSVCH1AJE: Servo termination board, revision 1; functionally equivalent to H2AJE with minor PCB layout differences; used in early Mark VI installations.
• IS200SVICH1A: Servo valve interface card; provides current-to-pressure signal conversion for hydraulic servo actuators in steam and gas turbine applications.
• IS200TRLYH1B: Relay output termination board; 16-channel relay array for protective trip and alarm functions in Mark VI control cabinets.

Analog I/O Termination Boards

• IS200TBAIH1C: Analog input termination board; 16-channel 4–20 mA / 0–10 V input conditioning; used for process variable acquisition in DCS loops.
• IS200TBCIH1C: Thermocouple input termination board; 16-channel cold-junction compensated TC input; supports J, K, T, E, R, S, B type thermocouples.
• IS200TRTDH1C: RTD input termination board; 12-channel 3-wire PT100/PT1000 resistance temperature detector interface.
• IS200TBAOH1C: Analog output termination board; 8-channel 4–20 mA current output for final control element positioning.

Digital I/O Termination Boards

• IS200TBCIH2C: Contact input termination board; 32-channel dry/wet contact digital input for field device status monitoring.
• IS200TBCOH1C: Contact output termination board; 16-channel relay/transistor output for solenoid valve and motor starter control.
• IS200TTURH1C: Turbine speed/proximity probe termination board; 6-channel magnetic pickup and proximity probe interface for overspeed protection.

Communication & Network Modules

• IS200VCMIH2C: VME communication interface module; primary Mark VI backplane controller managing I/O data exchange between termination boards and the VCRC processor.
• IS200VCRCG4B: VME controller/redundancy card; triple-redundant (TMR) voting processor for Mark VI turbine protection systems.
• IS200ECTBG1A: EtherCAT termination board; bridges legacy IS200 I/O to Mark VIe IONet Ethernet-based control architecture.

Power Supply & Conditioning Modules

• IS200EPSMG1A: Excitation power supply module; provides regulated DC excitation voltage for LVDT and resolver position sensors on servo termination boards.
• IS200TPROS1C: Power supply termination board; distributes 28 VDC and 5 VDC logic power across IS200 I/O rack assemblies.
• IS200BICLH1A: Backplane interconnect and logic card; manages slot addressing and inter-board communication within the IS200 VME chassis.

Quality Control for the IS200 Range

IS200 series boards present specific test challenges due to their VME backplane dependency, LVDT excitation circuits, and servo current loop outputs. DriveKNMS applies a dedicated IS200 test protocol that includes: functional backplane insertion testing using a Mark VI-compatible VME test chassis; LVDT excitation voltage verification (typically 7 Vrms at 3 kHz); servo output current loop calibration across the full ±100 mA range; relay contact resistance measurement (<100 mΩ); and 72-hour burn-in at elevated ambient temperature (50°C) to screen for latent component failures. Communication boards (VCMI, VCRC) undergo full IONet/ARCNET protocol handshake testing before release.