Hierarchical-structure plant control system
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United States of America Patent
Stats
-
Aug 31, 1982
Grant Date -
N/A
app pub date -
Jun 25, 1980
filing date -
May 2, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Sub-loop controllers arranged around a microprocessor are assigned to operation terminals to be controlled, and connected to a master controller and a host computer through a system bus to be supplied with a control command therefrom. Analog memories for manual control of the operation terminals are connected to the host computer through a special, common wiring. If one of the sub-loop controllers breaks down, the host computer directly controls the operation terminal by use of this analog memory thereby to back up the sub-loop controller.
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Cited Art Landscape
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