Boots – shoes – and leggings
Patent
1976-06-14
1978-10-03
Morrison, Malcolm A.
Boots, shoes, and leggings
2353034, 364200, 364115, G05B 1300, G06B 1500
Patent
active
041187725
ABSTRACT:
A digital controller system for controlling the flow of a plurality of processes, each of the processes being provided with a process detector and an actuator, the digital controller system comprising: a digital bus for transmitting digital signals from one location to another; an analog bus for transmitting analog signals from one location to another; a plurality of direct digital loop stations, each of said direct digital loop station adapted to be connected to a process detector and an actuator of a process for receiving analog signals characterizing the state of the process from the process detector and transmitting the analog signals onto the analog bus and for receiving digital signals controlling the flow of the process from the digital bus and transmitting corresponding analog signals to the operating apparatus; and a central processor unit for transmitting the digital signals controlling the flow of the process to the digital bus, and for receiving the analog signals characterizing the state of the process from the analog bus, the central processor unit including a digital computer, an analog-to-digital converter and a data transmission unit.
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patent: 3582621 (1971-06-01), Lawler
patent: 3636331 (1972-01-01), Amrehn
patent: 3984665 (1976-10-01), Shriver et al.
Wherry, T. C. et al; "Direct Digital Control"; Chemical Engineering Progress; vol. 64, No. 4, Apr. 1968; pp. 33-38.
Uram, R; "Bumpless Transfer Under Digital Control"; Control Engineering, Mar. 1971; pp. 59-60.
Morley et al; "The Ferranti System and Experience with Direct Digital Control"; IEEE Convention Record; #3, 1965.
Krass Errol A.
Morrison Malcolm A.
Tokyo Shibaura Electric Co. Ltd.
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