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🧠 The GE DS215UCVAG3AC is a complex modular assembly known as the Unit Controller/VME Assembly (UCVA), which serves as the main central processing unit (CPU) for one of the three redundant control cores ($\text{R, S, or T}$) in the General Electric Speedtronic Mark V Turbine Control System.
This assembly is the “brain” of the control core, executing the primary turbine control and protection logic.
⚙️ Core Functionality
The DS215UCVAG3AC UCVA assembly is responsible for high-speed computation, communication, and management of the turbine’s control strategy:
- Main Control Processor: It is built around a powerful processor (often a 486DX4-100 Processor) that runs the Speedtronic operating system and executes the control algorithms for the gas or steam turbine.
- VME Bus Interface: It plugs directly into and communicates over the VME bus (Versa Module Eurocard), which is the high-speed backplane in the Mark V control rack. This allows it to read data from and send commands to the various Digital and Analog I/O boards.
- Networking Hub: It is equipped with multiple communication ports critical for the system’s operation and interfacing:
- DLAN+ ports: For GE’s proprietary control network communication.
- Genius LAN ports: For interfacing with the I/O network.
- Ethernet ports (10Base2): For communication with the Human-Machine Interface (HMI) and external systems.
- Memory: It includes substantial memory resources for its time, typically featuring 16MB of DRAM and 4MB of flash memory to support the operating system and control program.
🛠️ Hardware and Features
- Modular Assembly: The UCVA board is a complex unit that often occupies multiple slots in the VME rack and may contain one or more daughter cards to achieve its full functionality.
- Diagnostics: The front panel is populated with LED status indicators that provide the operator with a quick visual diagnosis of the board’s health, Ethernet connection status, and other critical functions.
- Interfaces: It features a connector for an optional Hard Disk Drive (HDD) and configuration points like configuration switches and a reset button for forcing firmware reload and troubleshooting.
In a Mark V TMR system, three identical UCVA assemblies ($\text{R, S, T}$) operate in parallel, executing the same code and using a 2-out-of-3 voting logic to ensure high reliability and to prevent a single component failure from causing a turbine trip.
