GE DS215UCVAG3AD Unit Controller/VME Board

GE DS215UCVAG3AD Unit Controller/VME Board

The DS215UCVAG3AD is essentially the brain of its respective control channel within the Mark V’s Triple Modular Redundancy (TMR) architecture.

  • Main Processor: It houses the central processing unit (CPU), which is typically a 486DX4-100 Processor or similar.2 This CPU executes the turbine control logic, runs the Speedtronic operating system, and manages the entire control sequence.
  • VME Bus Interface: The board is specifically designed to interface with the VME bus (Versa Module Eurocard). The VME bus is the high-speed backplane used to communicate with and command the various Analog and Digital I/O boards (like the TCDA, TCQA, etc.) that are plugged into the Mark V VME rack.
  • Network Communications: It manages critical communication links for the entire control core, typically including:
    • DLAN+ ports: For proprietary GE local area network communication.3
    • Genius LAN ports: For I/O network connectivity.4
    • Ethernet ports: For connecting to the Human-Machine Interface (HMI) and other external systems.
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🤖 The GE DS215UCVAG3AD is a key component known as the Unit Controller 2000/VME Board (often referred to as the UC2000V Module) used in the General Electric Speedtronic Mark V Turbine Control System.1

It serves as the main CPU and communication engine for one of the control cores ($\text{R, S, or T}$) in the system.

🧠 Primary Function as the Control Core

The DS215UCVAG3AD is essentially the brain of its respective control channel within the Mark V’s Triple Modular Redundancy (TMR) architecture.

  • Main Processor: It houses the central processing unit (CPU), which is typically a 486DX4-100 Processor or similar.2 This CPU executes the turbine control logic, runs the Speedtronic operating system, and manages the entire control sequence.
  • VME Bus Interface: The board is specifically designed to interface with the VME bus (Versa Module Eurocard). The VME bus is the high-speed backplane used to communicate with and command the various Analog and Digital I/O boards (like the TCDA, TCQA, etc.) that are plugged into the Mark V VME rack.
  • Network Communications: It manages critical communication links for the entire control core, typically including:
    • DLAN+ ports: For proprietary GE local area network communication.3
    • Genius LAN ports: For I/O network connectivity.4
    • Ethernet ports: For connecting to the Human-Machine Interface (HMI) and other external systems.

⚙️ Technical Details

  • Series: GE Speedtronic Mark V Turbine Control System.5
  • Assembly Size: This is a modular assembly that typically occupies four VME slots in a standard VME rack, reflecting the complexity of the processor and communication interfaces it contains.6
  • Memory: It is populated with necessary memory resources, such as DRAM and flash memory, to store the operating system and execute the control program.7
  • Features: The board includes LED indicators for quick diagnostics, configuration switches, and connectors for peripherals like a hard disk drive (HDD) or a keyboard/monitor for initial setup.8

In a TMR system, three of these UC2000V modules ($\text{R, S, T}$) operate simultaneously, comparing their results and voting on the correct action to ensure continuous, reliable, and safe operation of the turbine.

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