IS200TDBTH2ABC is a GE TDBT discrete input/output terminal board for Mark VIe turbine-control systems. The complete H2ABC identity denotes the H2 hardware group and its revision trail, which must be preserved during sourcing and receiving.

The TDBT design is used for TMR operation with three PDIO I/O packs. It terminates 24 group-isolated contact inputs and 12 form-C relay outputs, with pluggable terminal blocks and noise suppression at the field interface.

• Twenty-four contact inputs use the H2 nominal 24 VDC wetting-voltage configuration.
• The documented H2 input range is 16 to 32 VDC from a floating external wetting source.
• Twelve form-C relay outputs provide discrete control functions.
• Three D-type PDIO connection points support the R, S and T controller paths.
• Input filtering suppresses surge and high-frequency noise near the field entry point.

• Export the discrete I/O configuration, relay logic, diagnostics, wetting-supply details and redundancy state.
• Photograph the IS200TDBTH2ABC label, terminal blocks, PDIO connectors, option hardware and every field conductor.
• Place the turbine controls in the approved maintenance state and isolate field and relay energy.
• Rebuild the wiring from a checked I/O schedule, including commons, shields and the floating wetting source.
• Prove all 24 inputs, 12 relay outputs, PDIO paths, diagnostics and TMR behavior before release.

• TMR contact-input termination in Mark VIe gas- and steam-turbine controls.
• Discrete permissive, status and alarm acquisition with 24 VDC wetting.
• Form-C relay interfacing for auxiliary and control functions.
• Revision-controlled support of installed TDBT H2 terminal-board assemblies.