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GE IS200TDBTH6ABC｜Digital Input/Output Terminal Board｜
TMR Digital I/O Terminal Board (TDBT – Third-Module Redundant Discrete Terminal Board)
GE Speedtronic Mark VI / Mark VIe – IS200 Series
Product Overview
The TDBT TMR digital I/O terminal board is designed for GE Speedtronic Mark VI / Mark VIe turbine control systems operating in Triple Modular Redundant (TMR) architecture. It provides 24-channel digital signal acquisition and conditioning and supports 2-out-of-3 (2oo3) voting logic, ensuring high availability and fault tolerance for critical control and protection functions.
This terminal board serves as the third redundant discrete input interface in TMR configurations and is fully compatible with Mark VI / VIe TMR I/O modules.
Core Functions
24-channel discrete digital signal acquisition
Signal conditioning and filtering for TMR systems
Supports TMR third-leg redundancy
Enables 2oo3 voting logic for high-reliability control and protection
Enhances system availability and fault tolerance
System Compatibility
GE Speedtronic Mark VI / Mark VIe Gas & Steam Turbine Control Systems
Fully compatible with Mark VI TMR configurations
Installation & Mechanical Specifications
Installation method: Cabinet panel mounting
Terminal configuration:
Three terminal blocks: TB1, TB2, TB3
Suitable for on-site multi-channel digital signal wiring
PCB protection: Three-proof conformal coating
(moisture-proof, anti-mold, anti-salt-spray)
Weight: approx. 1.2 kg
Key Technical Parameters
Input Configuration
24 digital input channels
Input Voltage
Nominal excitation voltage: 24 V DC
Operating range: 18.5–32 V DC
Input Current
Channels 1–21: 2.5 mA per channel
Channels 22–24: 10 mA per channel
Signal Conditioning
Built-in RC filtering
Suppresses high-frequency noise and transient surges
Response Performance
Response time: ≤ 10 ms
Isolation & Anti-Interference
Channel-group electrical isolation
Resistant to ground loop interference
High tolerance to common-mode voltage surges
Power Supply
Powered by system backboard 24 V DC logic supply
Environmental Conditions
Operating temperature: –30 °C to +65 °C
Relative humidity: 5% to 95%, non-condensing
I/O Module Adaptation
Compatible with Mark VIe TMR I/O modules, including:
IS200VCMIH2C
IS200IOCCH1A
and equivalent TMR discrete I/O modules
Redundancy & Safety Features
Supports TMR third-leg redundancy
Fully compatible with 2-out-of-3 (2oo3) voting logic
Designed for safety-critical turbine control and protection loops
Typical Applications
Gas and steam turbine protection systems
Safety-critical discrete input processing
Trip, alarm, and interlock signals in TMR architectures
High-availability power generation control systems
GE IS200TDBTH6ABC｜Digital Input/Output Terminal Board｜
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By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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