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The GE $\text{DS200TCCBG1ALD}$ is a Common Extended Analog I/O Board (functional acronym $\text{TCCB}$) that is part of the GE Speedtronic Mark V Turbine Control System.
This board is specifically designed to provide additional analog I/O capacity to the core control system, extending the capabilities of the primary Analog I/O board ($\text{TCCA}$). The suffix “$\text{G1ALD}$” indicates a specific hardware and firmware revision within the G1 generation of the board.
💡 Function and Purpose
The primary role of the $\text{DS200TCCBG1ALD}$ board is to handle a secondary group of analog signals, primarily focusing on temperature measurement inputs.
- Analog I/O Extension: It acts as an extension module to the main processor core, allowing the Mark V system to monitor more analog inputs than the base $\text{TCCA}$ board can handle.
- $\text{RTD}$ Input Processing: A key function of the $\text{TCCB}$ is to process signals from Resistance Temperature Detectors ($\text{RTDs}$). It provides the necessary excitation current to the $\text{RTD}$ sensors, measures the resulting voltage change, and scales that signal into an accurate temperature reading for the control system.
- $\text{4-20 mA}$ Input/Output: It also provides circuitry for a limited number of $\text{4-20 mA}$ analog current inputs and outputs, which are standard for many industrial sensors and actuators.
The conditioned signals from the $\text{TCCB}$ are then transmitted to the main I/O Engine (typically the $\text{STCA}$ board) via a ribbon cable connection, integrating the extended data into the control logic.
⚙️ Key Hardware Details
The $\text{TCCB}$ is a microprocessor-based board that interfaces with dedicated terminal boards to receive signals from the field wiring.
| Feature | Description |
| System | GE Speedtronic Mark V Series Turbine Control System |
| Location | Typically installed in the R5 Core (or a similar I/O core) |
| Processor | Features an 80196 microprocessor for data acquisition and conditioning. |
| Memory | Contains multiple $\text{PROM}$ modules (Programmable Read-Only Memory) that hold the firmware and operational instructions. For replacement, the $\text{PROM}$ modules are often transferred to retain the site-specific software. |
| Interface Boards | The $\text{TCCB}$ interfaces with its corresponding field Terminal Boards, such as the $\text{TBCB}$ board (Extended RTD/Analog Terminal Board). |
| Connectors | Includes 50-pin connectors (often labeled $\text{JCC}$ and $\text{JDD}$) for ribbon cable connection to the terminal boards and the 3PL connector for data transfer within the core. |
| Indicators | Features a single green $\text{LED}$ to indicate board power status and operational health. |
🔄 Revision Codes
The part number $\text{DS200TCCBG1ALD}$ follows a common GE naming convention:
- $\text{DS200}$: Identifier for the overall series of Mark V control components.
- $\text{TCCB}$: Turbo-Generator Common Core Board (Extended Analog I/O).
- $\text{G1}$: Indicates the hardware generation.
- $\text{ALD}$: Specific manufacturing, hardware, and/or firmware revision codes.
