Boots – shoes – and leggings
Patent
1981-12-30
1985-02-19
Smith, Jerry
Boots, shoes, and leggings
364133, 364138, 364200, 371 9, G05B 2302, G06F 1546
Patent
active
045009511
ABSTRACT:
In a plant control system, a transmission channel includes loop transmission lines arranged in duplex. Equivalently connected to this transmission channel are a plurality of one-loop controller stations, a backup station backing up a disabled one of the plural controller stations and a display station for displaying the status of the controller stations and the backup station. Each of the controller stations, backup station and display station includes a built-in microcomputer. Each of these stations includes also a transmission interface circuit and a self-diagnostic circuit. The transmission interface circuit in each station selects one of the transmission lines for data transmission between its own station and the others. The self-diagnostic circuit in each station detects the presence of failure of normal operation of its own station and disconnects the disabled station from the transmission line, so that the other stations may not be adversely affected by the disabled station.
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Hamada Nobuhiro
Masuda Ikuro
Sakurai Jinichi
Sugimoto Norihiko
Hitachi , Ltd.
Lastova John R.
Smith Jerry
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