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GE IS200TDBTH6ACD｜Circuit Board｜
The IS200TDBTH6ACD is a TMR (Triple Modular Redundant) digital input terminal board used in GE Speedtronic Mark VI / Mark VIe turbine control systems. It provides 24-channel discrete signal acquisition and conditioning and serves as the third-leg redundant terminal board in TMR architectures.
The board supports 2-out-of-3 (2oo3) voting logic, ensuring high availability, fault tolerance, and reliable operation in safety-critical gas and steam turbine control and protection systems.
Core Functions
24-channel digital input signal acquisition
Signal conditioning and filtering for discrete inputs
Third-channel redundancy support in TMR systems
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
Compatible with Mark VI / VIe TMR configurations
Installation & Mechanical Specifications
Installation method: Cabinet panel mounting
Terminal configuration:
Three terminal blocks: TB1, TB2, TB3
Suitable for multi-channel on-site 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 Channels
24 discrete 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 filters
Suppression of high-frequency noise and transient surges
Response Time
≤ 10 ms
Isolation & Anti-Interference
Channel-group electrical isolation
Resistant to ground loop interference
High immunity 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
Associated I/O Modules
Compatible with Mark VI / Mark VIe TMR discrete I/O modules, including:
IS200VCMIH2C
IS200IOCCH1A
and equivalent TMR digital input modules
Typical Applications
Turbine protection and safety interlock systems
Redundant trip and alarm signal acquisition
Safety-critical discrete inputs in TMR architectures
High-availability power generation control systems
GE IS200TDBTH6ACD｜Circuit 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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