Boots – shoes – and leggings
Patent
1977-09-16
1979-05-01
Ruggiero, Joseph F.
Boots, shoes, and leggings
364103, 364108, 364900, G05B 1502, G06F 1546
Patent
active
041527607
ABSTRACT:
An industrial process control system to be used with processes which are geographically spread out over a relatively wide field area, with portions thereof located in respective zones, and wherein the process has associated therewith a large number of instrumentation elements including sensing elements and operating elements for controlling actuators such as process valves. The control system includes a central station with a digital computer which directs signals to a number of primary transmitter/receiver units each producing a swept-carrier wireless signal for transmission to a respective one of the field area zones. Within each zone are a plurality of local transmitter/receiver units similar to the primary units, with each local unit being assigned to one or more sensing elements and/or one or more operating elements. The local units continuously monitor the signals from the corresponding primary unit, and, when instructed by signals from the primary unit, carry out specified actions concenring the process element(s) assigned thereto. Actions to be taken include repositioning a process valve, changing the set-point of a controller, and transmitting back to the primary unit signals representing data needed for control of the process. The swept-carrier transmissions of the primary units are synchronized and controlled so that the carrier frequencies thereof are all different at substantially all instants of time.
REFERENCES:
patent: 3582621 (1971-06-01), Lawler
patent: 3755685 (1973-08-01), Kirk
patent: 3761889 (1973-09-01), Hallee et al.
patent: 3798424 (1974-03-01), Freitas et al.
patent: 3971000 (1976-07-01), Cromwell
Bennett, Jr. Victor A.
Freitas Manuel P.
Ruggiero Joseph F.
The Foxboro Company
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