Distributed control system having a control unit to detect and c

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G06K 1500

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active

053901320

ABSTRACT:
A distributed control system comprising a control station and a remote input/output device interconnected by a bus, wherein the system is provided with a continuation transmission service which first transmits an urgent output only and then performs cyclic scan transmission; an initialization start transmission service which first performs cyclic scan transmission for input only; an interruption duration measuring feature which measures the period of transmission interruption; and a control feature which activates the continuation transmission service when the result of the measurement is shorter than a predetermined period of time, and which activates the initialization start transmission service when the result of the measurement is longer than the predetermined period of time. Thus, for example, after a power supply failure, the system can rapidly recover and shift to normal process controlling operation without the delays normally experienced by prior control systems.

REFERENCES:
patent: 4546429 (1985-10-01), Chan et al.
patent: 4601012 (1986-07-01), Aiken, Jr.
patent: 4697266 (1987-09-01), Finley
patent: 4945474 (1990-07-01), Elliott et al.
patent: 5193181 (1993-03-01), Barlow et al.

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