Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1995-11-20
2000-06-13
Sheikh, Ayaz R.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
710101, 710 2, 710 62, 710 63, 710 64, 710 72, 361686, 439502, G06F 1300
Patent
active
060761245
ABSTRACT:
A field controller for use in a distributed control system including an area controller and at least one field controller. The field controller manages at least one controlled device in an industrial process operation. The field controller comprises a processor module segment through which it can control a selected number of devices, and it may also include one or more expansion module segments to enable it to control a larger number of controlled devices. The processor module segment includes a processor module and at least one local interface module for interfacing to a controlled device, and the expansion module segment includes interface modules for interfacing to other controlled devices. In the processor module segment, the processor module and said local interface module are interconnected by a bus segment, which is also connected to an upstream off-module connector. Each expansion module segment includes at least one interface module, and also includes a downstream off-module connector and an upstream off-module connector, which are interconnected by a bus segment. The downstream off-module connector of each expansion module segment is adapted to mate with the upstream off-module connector of the processor module segment and of other expansion module segment, so as to facilitate the interconnection of the processor module segment and a sequence of expansion module segments by establishing a unitary multi-drop bus comprising the processor module's bus segment and the bus segments of expansion module in the sequence. The processor module controls each controlled device through the respective local interface module or expansion interface module connected thereto. The processor module segment and each expansion module segment are each mounted in a housing segment which is configured to form a unitary housing when they are interconnected.
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IC Card System 7 Design. Sep./Oct. 1995. Cover Page and Back Inside Cover.
Kagan Harris D.
Korowitz Simon
Lake Harold
Barron David
Morris Jules Jay
Phan Raymond N
Powsner David J.
Sheikh Ayaz R.
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