Process control system

Details Process control system Process control system

1977-11-15

1979-04-24

Ruggiero, Joseph F.

Boots, shoes, and leggings

318591, 364101, 364103, 364117, 364200, G06F 1546, G05B 700

Patent

active

041515900

ABSTRACT:
A process control system for multiplex operation of several process control loops. The system includes process input and process output units, analog and computer operation units and operator's interface stations, the exchange of process information between these units and stations being carried out by a time-sharing technique. The system is provided with a first data trunk through which process information through the data trunk is carried out in synchronism with address signals supplied to the address trunk in accordance with a cyclic control routine. Also included is a second data trunk which makes it possible at one's option to modify the cyclic control routine to select a desired mode of operation, the analog and computer operation units and the interface stations signalling whether operation in the manual control, analog control, or control mode is possible. State signals are generated at the operator's interface stations to the respective units to control their signal transmitting or receiving state.

REFERENCES:
patent: 3479493 (1969-11-01), Jacques et al.
patent: 3526757 (1970-09-01), Rees et al.
patent: 3566355 (1971-02-01), Smith
patent: 3694633 (1972-09-01), Lejon
patent: 3760374 (1973-09-01), Nabi
patent: 3987351 (1976-10-01), Appelberg

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