The GE IS220PPROS1B is an Emergency Turbine Protection I/O Pack for the Mark VIe Series used in GE Distributed Control Systems. It is a critical component of the turbine protection system, providing independent backup overspeed protection and monitoring the health of the turbine.

The IS220PPROS1B has the following features:

·Three Triple Modular Redundant (TMR) PPRA I/O packs installed to a TREA terminal board with the WREA option board included make up a protective system.
·Provides an independent backup Overspeed protection mechanism.
·Provides an independent watchdog function for the principal control and isolated trip contact input.
·Supports six speed signals (specified as three sets of speed pairs) for firmware overspeed, acceleration, deceleration, and a hardware implemented overspeed protection.
·Monitors the main control’s operation.
·Uses a broad range of feedback signals to monitor the state and functionality of the TREA trip board.
·Communicates with the control modules through IONet.

The IS220PPROS1B is a vital part of the Mark VIe control system and helps to ensure the safe and reliable operation of gas and steam turbines.

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