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GE IS200BPPBH2B Safety I/O Pack
The GE IS200BPPBH2B is a crucial component known as a Safety I/O Pack or I/O Processor Board. It is part of the General Electric Mark VI and later Mark VIeS (Safety) series of Turbine Control Systems.
Its function is not to handle field wiring directly but to serve as the processor and communication interface for a larger I/O module, ensuring that safety-critical functions are monitored and controlled reliably.
⚙️ Core Function and System Role
The is a compact auxiliary circuit board that acts as the core processor for several larger I/O terminal boards/packs.
- I/O Processing Core: It contains the main local processor, data acquisition circuitry, and memory (including an memory chip) that manages the flow of input and output data for the connected terminal board.
- Safety Criticality: The family, particularly in the revision, is designed for use in safety-critical applications like turbine overspeed protection, burner management, and emergency shutdown systems. It must meet stringent safety integrity levels (SIL).
- System Integration: It is designed to work in conjunction with a larger I/O Terminal Board (the “motherboard”) which provides the physical connection points for field wiring. The board handles the digital processing and communication layer for that terminal board.
- Communication: It provides essential communication functions, often including connectivity for integration into systems, and manages internal communication with the main Mark VI controller.
🛠️ Usage in GE Control Systems
The is a processor base for many different functional I/O packs. It is typically associated with H1A and H2A I/O packs in the Mark VI series, although newer systems often mandate migration to the BPPC (Bridge Processor Card C) based packs.
The model is known to be used with specific I/O packs to define their function, such as:
- PCAA (Core Analog I/O)
- PPRA/PPRO (Protection I/O for Backup Turbine Protection)
- PTUR (Primary Turbine Protection)
- PSVO (Servo I/O)
In a Triple Modular Redundant () system, three separate -based I/O packs may be used to implement the -out-of- voting logic essential for high-integrity safety functions.
⚠️ Important Note on Revision
The suffix H2B denotes a specific hardware and firmware revision.
- The I/O packs contain the BPPB processor (like the one referenced here), which is an older architecture.
- Newer ControlST software versions often require or support the migration to the H1B/H2B I/O packs containing the newer BPPC processor.
When replacing the or its associated I/O pack, exact revision matching is mandatory for system integrity, or an approved migration path must be followed, often requiring a corresponding software upgrade in the controller.
