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The GE IS200SDIIH1A is a Digital Input Card for the GE Mark VIe (MKVIe) turbine control system. Its primary function is to read discrete, or digital, signals from various field devices. The letters “SDII” indicate it’s a Simplex Digital Input-Input module, designed for non-redundant applications where a single input channel is sufficient.
Function and Purpose ⚙️
The IS200SDIIH1A serves as a vital interface between the turbine’s physical components and the control system’s processor. It takes high-voltage, on/off signals from the field and converts them into a low-voltage format that the controller can interpret. This is crucial for monitoring the status of critical equipment, such as:
- Switch status: Open or closed position of limit switches.
- Relay status: On/off status of protective relays.
- Push-button signals: Activation of start, stop, or emergency trip buttons.
By providing a clear and isolated path for these signals, the card ensures that the control system receives accurate information for sequencing, protection, and operational logic.
Related Components
The IS200SDIIH1A works in conjunction with other components of the Mark VIe system to form a complete control loop. These components include:
- Processor Cards: The main CPU of the system, which reads the digitized data from the IS200SDIIH1A.
- I/O Packs: These electronic modules mount directly on the terminal board and contain the active electronics for signal processing and conditioning.
- Field Devices: The card connects to a variety of digital field devices, such as limit switches, pressure switches, and solenoids, to acquire the necessary status information.
