Boots – shoes – and leggings
Patent
1989-01-27
1989-09-05
Lastova, John R.
Boots, shoes, and leggings
364138, 455603, 455607, 34082506, 350 9616, 370 8512, G06F 1546, H04B 900
Patent
active
048644897
ABSTRACT:
An improved field instrumentation system employing optical multiplex transmission in which data from a plurality of field devices, including both sensors and controllers, are transmitted through an optical distributor, such as a star coupler, to a master processor at a control panel location as well as to other field devices. The optical distributor branches and couples in a ratio of N:N, the data which are transmitted bidirectionally through the various optical transmission paths connected to the field devices to form the basis of a control loop located in the field. A submaster processor, located in the field and coupled to the optical distributor, is automatically substituted for the master processor in the event that the master processor is disabled. The overall reliability of this system is thereby markedly improved.
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Nabeta Eiichi
Yasuhara Takeshi
Fuji Electric & Co., Ltd.
Lastova John R.
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