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The GE DS200TCDAG1BCB is a specific revision of the Digital Input/Output ($\text{I/O}$) Printed Circuit Board ($\text{PCB}$), functionally known as $\text{TCDA}$, used in the $\text{Speedtronic Mark V}$ Turbine Control System.
This board is responsible for interfacing the main control processors with the plant’s digital (on/off) field devices.
⚙️ Key Function and Role
The primary purpose of the $\text{DS200TCDAG1BCB}$ ($\text{TCDA}$ board) is to process all digital input and output signals for the turbine control logic.
- Digital Inputs (Contact Inputs): It receives $\text{24 V DC}$ digital signals from terminal boards ($\text{DTBA}$ and $\text{DTBB}$) which indicate the status of field devices such as:
- Limit switches (e.g., valve position)
- Pressure and temperature switches
- Manual operator requests (e.g., start/stop pushbuttons)
- Alarm acknowledgments
- Digital Outputs (Contact Outputs): It transmits control signals to other boards (like the $\text{TCRA}$ board) which then energize relays and solenoids to activate or de-activate field devices such as:
- Start/stop commands for auxiliary motors
- Solenoid valves for fuel, lube oil, or trip systems
- Panel indicator lights
- Signal Communication: It uses a dedicated microprocessor to condition and transmit this digital data across the control system’s high-speed internal network, the $\text{IONET}$, to the redundant $\text{R}$, $\text{S}$, and $\text{T}$ control cores.
📋 Technical Identification
The full part number $\text{DS200TCDAG1BCB}$ breaks down to identify its specific revision within the $\text{Mark V}$ series:
| Part Segment | Meaning |
| $\text{DS200}$ | $\text{GE}$ $\text{Speedtronic Mark V}$ $\text{DS200}$ Series |
| $\text{TCDA}$ | Functional Acronym: $\text{T}$urbine $\text{C}$ontrol $\text{D}$igital $\text{A}$uxiliary ($\text{Digital I/O Board}$) |
| $\text{G1}$ | Group $\text{1}$ Assembly |
| $\text{B}$ | Primary Functional Revision |
| $\text{C}$ | Secondary Functional Revision |
| $\text{B}$ | Artwork/Assembly Revision |
- Location: The $\text{TCDA}$ board is typically housed in one of the Digital $\text{I/O}$ cores, such as $\text{Q11}$, $\text{Q21}$, or $\text{Q51}$, within the $\text{Mark V}$ cabinet.
- Configuration: The board includes eight hardware jumpers ($\text{J1}$ through $\text{J8}$) which are used to set its $\text{IONET}$ address, termination resistors, and other configuration options.
- Diagnostics: $\text{LED}$ indicators are present on the board to display power and diagnostic status for troubleshooting.
The $\text{DS200TCDAG1BCB}$ is a core component for the sequential and functional control of a gas or steam turbine governed by the $\text{Mark V}$ system.
