Boots – shoes – and leggings
Patent
1980-10-24
1983-06-07
Wise, Edward J.
Boots, shoes, and leggings
137392, 34087016, G06F 1500, H04Q 100, G05D 900, G05B 1500
Patent
active
043874347
ABSTRACT:
An intelligent field interface device for use in a fluid storage facility is disclosed. A bidirectional standard serial communication bus (20) provides communication between a plurality of the interface devices (17) and a central location (18). Surge and lightning protection (50, 51) as well as a high degree of electrical and magnetic isolation (45) are provided between the power supplies of the system. Each device includes a local one chip microcomputer (35) which has a field set address (56) and communicates through optoisolation (27) with the bus through a UART (28). Analog multiplexing (40) of RTD outputs (176-179) or outputs of other transducers (162) is provided to a local to analog to digital converter (36) so that all measured tank parameters may be transmitted digitally back to the control location. An arrangement for both testing and operating a motor operated valve (110) through a two-wire circuit (141, 132) including a limit switch (119) is also shown.
REFERENCES:
patent: 4020488 (1977-04-01), Martin et al.
patent: 4227246 (1980-10-01), Vaughan et al.
patent: 4244385 (1981-01-01), Hotine
patent: 4258422 (1981-03-01), Dougherty et al.
patent: 4275382 (1981-06-01), Jannotta
Chow Edmund E.
Glass Frank S.
Hernandez Rafael
Moncrief, Jr. Marion L.
Process Technologies, Inc.
Wise Edward J.
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