GE IS200 Series Modules: IS200TBTCH1CBB Input Terminal Board

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The GE IS200 series constitutes the core I/O and control hardware platform of the GE Mark VI Turbine Control System, one of the most widely deployed distributed control architectures in heavy industrial environments globally. Installed across gas turbine power plants, combined-cycle facilities, petrochemical refineries, offshore platforms, and nuclear auxiliary systems, the IS200 series provides the physical interface layer between the Mark VI controller backplane and field instrumentation. Its modular architecture — spanning terminal boards, I/O packs, power supplies, and communication adapters — enables granular replacement and lifecycle extension without full system overhaul. The IS200TBTCH1CBB is a thermocouple input terminal board within this ecosystem, providing the field wiring interface for thermocouple-based temperature measurement channels routed to the Mark VI TCCA or TCDA I/O packs.

The Evolution of IS200 Architecture

The IS200 platform was introduced alongside the GE Mark VI control system in the mid-1990s as a successor to the Mark V architecture. Early IS200 boards used passive terminal block designs with direct field wiring to I/O packs via ribbon or discrete cable harnesses. As the Mark VI evolved through hardware revisions (A, B, C suffix variants), IS200 boards incorporated improved EMI shielding, revised connector pinouts, and updated PCB layouts to address field reliability issues identified in high-vibration and high-temperature installations.

Compatibility note: IS200 terminal boards are not interchangeable with IS420 series boards. Backplane connector geometry, I/O pack interface protocols, and field wiring termination layouts differ between generations. Cross-referencing must be performed at the system level before substitution.

IS200 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked IS200 series modules. Classification follows functional role within the Mark VI architecture:

Thermocouple & RTD Input Terminal Boards

• IS200TBTCH1CBB: Thermocouple input terminal board; field wiring interface for TC channels to TCCA/TCDA I/O packs.
• IS200TBTCH1AAA: Thermocouple terminal board, A-revision; earlier hardware variant with legacy connector layout.
• IS200TRLYH1BCC: Relay output terminal board; interfaces relay coil drive signals from Mark VI to field devices.

Analog Input/Output Terminal Boards

• IS200VAICH1C: Analog input terminal board; 4–20 mA and voltage signal conditioning for process instrumentation.
• IS200VAOAH1BAA: Analog output terminal board; provides 4–20 mA output channels for valve positioners and actuators.
• IS200TICIH1C: Analog input terminal board variant; used with TICIH I/O pack for current input channels.

Digital Input Terminal Boards

• IS200VSVOH1B: Servo output terminal board; interfaces electrohydraulic servo valve drive signals.
• IS200DTURH1BBA: Turbine speed/proximity input terminal board; interfaces magnetic pickup and proximity probe signals.
• IS200EDCFH1A: DC feedback terminal board; used for position feedback from LVDT-type sensors.

Digital Output Terminal Boards

• IS200TRLYH1BCC: Relay output terminal board; 24 VDC coil drive for discrete output channels.
• IS200VSVOH1BAA: Servo valve output terminal board; high-current servo drive interface.

Communication & Processor Modules

• IS200ECTBH1A: Ethernet communication terminal board; provides network interface for Mark VI controller nodes.
• IS200EPCTG1A: Ethernet patch panel terminal board; structured cabling interface for Mark VI network segments.
• IS200BICIH1A: Bus interface and communication board; inter-controller data exchange within Mark VI TMR configurations.

Power Supply & Backplane Modules

• IS200PSCDH1A: DC power supply distribution board; distributes 28 VDC and 5 VDC rails to I/O pack backplane slots.
• IS200BAIAH1AAA: Backplane analog input assembly; integrates signal conditioning directly on the backplane for high-density AI configurations.

Sourcing Hard-to-Find & Obsolete IS200 Parts

For plants operating Mark VI systems beyond their original design life, DriveKNMS provides long-term maintenance supply agreements covering IS200 terminal boards, I/O packs, and associated cabling assemblies. Minimum order quantities are not required for emergency spare procurement.

Quality Control for the IS200 Range

IS200 terminal boards present specific test challenges due to their passive and semi-passive circuit architectures. DriveKNMS applies the following verification procedures to all IS200 inventory prior to shipment:

• Visual inspection: PCB trace integrity, connector pin condition, component seating, and revision label verification against GE engineering drawings.
• Continuity and isolation testing: All field terminal-to-backplane connector signal paths are verified for continuity. Inter-channel isolation resistance is measured to confirm no cross-talk or short-circuit conditions.
• Functional bench test: Where applicable, boards are installed in a Mark VI test rack and exercised with simulated field signals to verify correct signal routing and termination behavior.
• Backplane connector inspection: The high-density DIN-style backplane connectors on IS200 boards are inspected for bent pins, corrosion, and mating force degradation — a common failure mode in boards removed from high-vibration installations.
• Revision documentation: Each board is shipped with a test record identifying the hardware revision, test date, and technician ID.