The San Francisco Bay Area Rapid Transit District (BART) uses a computer-operated network to control its heavy rail train system. The computer system is currently undergoing a major upgrade to improve performance and maintainability. The new BART system will comprise: a Central Computer System (CCS) and 45 Process Input/Output (PIO) subsystems. Each PIO communicates with the CCS over a redundant communications link. A PIO is responsible for translating commands related to facilities operation from the CCS into signals to the BART plant and for observing and reporting plant status to the CCS. Although not a part of the train control safety system, the PIOs are an essential component in overall system operation. Consequently, stringent reliability and availability requirements have been placed on it. A PIO contains a dual-redundant processor that communicates with a cross-strapped input/output subsystem. This architecture was chosen to meet the availability goals and to facilitate repair. The dual-redundant architecture greatly facilitates fault detection and diagnosis.
Diagnostics for a reliable plant controller
Diagnostik fuer einen zuverlaessigen Anlagenregler
1983
4 Seiten, 1 Bild
Conference paper
English
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