GE IS200TDBTH6ACD TMR Discrete I/O Terminal Board for Mark VI

Product Description

IS200TDBTH6ACD is a high-density discrete signal terminal board dedicated to GE Mark VI/VIe triple redundant (TMR) gas & steam turbine control racks. It acts as the physical wiring bridge between on-site turbine field equipment and core I/O processor cards (VPRO, VTC, VTUR etc.).

The board integrates 24 channels of DC digital wetting input and 12 groups of Form-C relay isolated outputs, matched with screw terminal blocks and multi-channel ribbon cable connectors to connect VME I/O packs. It adopts enhanced ground plane PCB layout with three-proof conformal coating, built-in surge suppression and RC filter circuits to resist strong EMI interference in turbine halls. Widely used as maintenance spare for thermal power, oil & gas turbine control cabinet wiring interface replacement.

Suffix Explanation:

TDBT = T Discrete Board Terminal

H6ACD = Hardware revision H6, full I/O channel configuration

Technical Specifications

PN: IS200TDBTH6ACD, Manufacturer: GE USA

System Compatibility: Mark VI, Mark VIe TMR Speedtronic turbine control rack

Digital Input: 24 channels, nominal 24VDC wetting, range 18.5–32VDC

Ch1–21: 2.5mA per channel; Ch22–24: 10mA per channel

Relay Output: 12 isolated Form-C relay channels, single channel max 5A load

Isolation: 2.5kV DC channel-to-backplane electrical isolation

Signal Filter: Onboard MOV surge absorption + RC low-pass filter, response ≤10ms

Interfaces: 3 groups screw terminal blocks (TB1/TB2/TB3), 2×DB ribbon cable connectors for VME I/O packs

Power Supply: Rack backplane 24VDC logic power, typical consumption 2A

Mount: Cabinet flat panel mounting, standard rack layout

PCB Protection: Conformal coating (moisture, mold, salt spray resistant)

Operating Temp: -30℃ ~ +65℃; Storage: -40℃ ~ +85℃

Humidity: 5%–95% non-condensing, IP20 cabinet environment

Weight: ~1.2kg

Key Features

Integrated 24DI + 12DO hybrid discrete signal interface, one board completes turbine switch signal collection and actuator driving.

Independent channel isolation design, effectively eliminate field ground loop and high-frequency electromagnetic noise.

TMR triple modular redundant compatible, supports 2oo3 voting safety logic for turbine protection.

Optimized multi-layer ground PCB, reduce EMI interference by 30% compared with older H4/H5 versions.

Built-in surge suppression components to avoid damage from field wiring short-circuit and voltage surge.

Color-coded terminal labels, reduce wiring error during commissioning and overhaul.

Rugged anti-vibration PCB design, stable long-term operation in high-vibration turbine room.

Direct plug-and-play replacement for old terminal boards, no cabinet modification required.

Application Scope

Field signal wiring terminal assembly for Frame series gas turbine Mark VI/VIe control cabinets

Steam turbine, generator emergency interlock discrete input/output interface board

Cogeneration unit, industrial large compressor safety protection signal connection module

Offshore platform power generation turbine control cabinet spare replacement

Thermal power plant boiler auxiliary system, speed control, overspeed protection wiring board

Global aging GE Speedtronic Mark VI/VIe system overhaul, spare inventory and technical transformation