GE DS215UCVAG1AD Unit Controller 2000/VME Board

GE DS215UCVAG1AD Unit Controller 2000/VME Board

The DS215UCVAG1AD board is the central intelligence of one of the redundant control cores ($\text{R, S, or T}$) in the Mark V system. Its functions include:

  • Main Control Processing: It houses the main CPU (like an Intel 486 or 586 processor in its era) responsible for executing the turbine control logic, running the Speedtronic operating system, and managing overall turbine operation.
  • VME Interface: It interfaces directly with the VME bus, which is the high-speed backplane that allows it to communicate with and control the other Digital and Analog I/O boards (like the TCDA, TCQA, etc.) mounted in the VME rack.
  • Networking and Communication: It features multiple communication ports to handle all necessary network traffic for the control system, including:
    • DLAN+ ports (GE’s proprietary LAN).
    • Genius LAN ports (for I/O network communication).
    • Ethernet ports (for HMI and external device communication).
  • System Hosting: It is often described as a modular assembly because it hosts other necessary daughter cards (like the $\mu$GENI boards) to achieve its full functionality.
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🔍 The GE DS215UCVAG1AD is a key component known as the Unit Controller 2000/VME Board (UCVA), which serves as a specialized main processor and communications module for the General Electric Speedtronic Mark V Turbine Control System.

It is part of the UC2000V Module sub-series, where the “V” specifically denotes its use with the VME bus (Versa Module Eurocard) standard.

🧠 Primary Function

The DS215UCVAG1AD board is the central intelligence of one of the redundant control cores ($\text{R, S, or T}$) in the Mark V system. Its functions include:

  • Main Control Processing: It houses the main CPU (like an Intel 486 or 586 processor in its era) responsible for executing the turbine control logic, running the Speedtronic operating system, and managing overall turbine operation.
  • VME Interface: It interfaces directly with the VME bus, which is the high-speed backplane that allows it to communicate with and control the other Digital and Analog I/O boards (like the TCDA, TCQA, etc.) mounted in the VME rack.
  • Networking and Communication: It features multiple communication ports to handle all necessary network traffic for the control system, including:
    • DLAN+ ports (GE’s proprietary LAN).
    • Genius LAN ports (for I/O network communication).
    • Ethernet ports (for HMI and external device communication).
  • System Hosting: It is often described as a modular assembly because it hosts other necessary daughter cards (like the $\mu$GENI boards) to achieve its full functionality.

⚙️ Technical Context

  • System Series: GE Speedtronic Mark V Turbine Control System.
  • Assembly: This board is actually a modular assembly that can take up to four slots in the standard Mark V VME rack, containing the main processor and interface circuitry.
  • Configuration: The board includes configuration switches and status LED indicators for system health and diagnostics. It also has a connector for an optional hard disk drive (HDD).

The UCVA board is fundamentally the brain of an $\text{R, S, or T}$ core, making it critical for the TMR (Triple Modular Redundancy) architecture, where three of these modules operate in parallel and vote to ensure continuous, safe control of the turbine.

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