GE IS200TPROH1BCB: Mark VI Turbine Control Printed Circuit Board

Technical Dossier

Product Details And Specifications

GE IS200T Series Technical Notes

The GE IS200T series is a family of printed circuit boards and I/O modules engineered for the GE Mark VI Turbine Control System — one of the most widely deployed distributed control platforms in heavy industry. Installations span gas turbine power generation facilities, combined-cycle plants, petrochemical refineries, offshore platforms, and nuclear auxiliary systems across North America, Europe, and Asia-Pacific. The Mark VI platform, of which the IS200T series forms the core I/O and processing layer, has accumulated decades of field runtime in environments demanding continuous uptime, deterministic scan cycles, and fault-tolerant redundancy. The IS200TPROH1BCB is a protection I/O board within this series, responsible for interfacing protection-class signals between the turbine instrumentation and the Mark VI controller backplane.

The Evolution of IS200T Architecture

The IS200T series was introduced as part of GE's transition from the Mark V to the Mark VI control platform in the late 1990s. Mark V relied on a VME-based backplane with discrete analog and digital I/O boards; Mark VI replaced this with a high-speed serial backplane (IONet) and a modular I/O architecture where each IS200T board performs a specific, dedicated function. Early IS200T revisions (suffix A, B) used through-hole component construction on critical signal paths; later revisions (C, D, H) migrated to surface-mount technology, improving vibration resistance and reducing board footprint. The suffix structure in GE part numbers encodes the hardware revision (e.g., H1B = hardware revision H, firmware variant 1, board variant B), making cross-revision compatibility a critical sourcing consideration. As the Mark VI platform entered its mature phase in the 2010s, GE introduced the Mark VIe as the successor architecture; however, the IS200T series remains in active service at thousands of sites globally, and OEM production of many IS200T variants has been discontinued, shifting procurement to the aftermarket and certified repair channel. Compatibility between IS200T revisions is not always guaranteed — board-level firmware, EEPROM configuration, and backplane slot assignments must be verified against the site-specific Mark VI application software revision before substitution.

IS200T Full Catalog & Functionalities (SKU List)

The following IS200T series modules represent the most commonly installed and sourced variants across Mark VI turbine control applications. Each board is functionally dedicated and non-interchangeable within the Mark VI backplane architecture.

IS200TPROH1BCB: Protection I/O board; interfaces turbine protection-class analog and discrete signals to Mark VI controller backplane.
IS200TPROH1B: Protection I/O board, earlier hardware revision; functionally equivalent to H1BCB with revision-level differences in component population.
IS200TTURH1BCB: Turbine I/O board; handles speed, temperature, and vibration signal conditioning for turbine monitoring loops.
IS200TTURH1B: Turbine I/O board, prior revision; used in earlier Mark VI installations with identical functional role.
IS200TCQCH1BCB: Contact input/output board; manages discrete contact closure signals for trip and permissive logic circuits.
IS200TCQCH1B: Contact I/O board, earlier revision; same functional role as H1BCB variant.
IS200TSVOH1BCB: Servo output board; provides analog current output signals to electro-hydraulic servo valves controlling fuel and inlet guide vanes.
IS200TSVOH1B: Servo output board, prior revision; used in legacy Mark VI servo control loops.
IS200TBCIH1BCB: Backplane communication interface board; manages IONet serial communication between I/O packs and the Mark VI controller.
IS200TBCIH1B: Backplane communication interface, earlier revision; same IONet protocol role.
IS200TPROS1BCB: Protection I/O board, simplex configuration; used in non-redundant Mark VI protection architectures.
IS200TPROS1B: Protection I/O board simplex, prior revision.
IS200TAIAH1BCB: Analog input board; conditions thermocouple and RTD signals for exhaust temperature measurement arrays.
IS200TAIAH1B: Analog input board, earlier revision; same thermocouple/RTD conditioning function.
IS200TBAIH1BCB: Analog input board variant; used for pressure transducer and 4–20 mA process signal inputs.
IS200TBAIH1B: Analog input board, prior revision; same 4–20 mA input function.
IS200TDIOH1BCB: Digital I/O board; handles 24 VDC discrete input and output signals for auxiliary equipment control.
IS200TDIOH1B: Digital I/O board, earlier revision.