Multiplex control system
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United States of America Patent
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-
May 6, 1986
Grant Date -
N/A
app pub date -
Oct 17, 1984
filing date -
Oct 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiplex control system including a plurality of controllers, the main controller being arranged by hardware, while the subsidiary controller being accomplished by software. Each of the controllers has a PID operator for calculating the proportional, differential and integral components of process data, and the difference of the integral components of both PID operators is processed through a first-order time lag operator and the result is used to correct the error of the output from the PID operator of the subsidiary controller. In the occurrence of abnormality, control of the control object is switched from the main controller to the subsidiary controller using the first-order time lag element attached to the switch unit thereby preventing the tracking of control data.
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