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Title:
Distributed single board computer industrial control system
Abstract:
An industrial control system in accordance with the present invention is provided with a plurality of diverse controlled devices (e.g., fans, pumps, valves, solenoids, relays, etc.) for effecting overall system control. Each device has a unique set of logic control functions and/or command sequences and is connected, through an input/output interface, to a stored-program single board computer that provides device control and monitoring. The computers each include a central processor controlled by a composite or "master" program which is common to all the computers and which includes instruction sequences for all logic control functions and command sequences that exist within the system. A user alterable interconnection device (UAID) permits only those logic control function and/or command sequence portions of the master program that relate to a particular one of the controlled devices to operatively connect with the particular input/output ports associated with that controlled device. As the master program successively loops, only those logic control functions and/or command sequences that relate to the particular controlled device, as determined by the user alterable interconnection device, are operative to address the input-output ports associated with the controlled device and thereby effect device control and monitoring. The invention permits simple and efficient dedication of a plurality of single board computers having only one master program to an equal member of diverse controlled devices without the drawbacks normally associated with dedicated stored-program controllers.
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Inventors:
Johnson, William D. (Dallas, TX, US) Ewing, Donald L. (Richardson, TX, US) Grisham, Jr., James S. (Arlington, TX, US)
Application Number:
037189
Filing Date: 1979-05-08 Publication_date: 1981-02-24 Assignee:
Forney Engineering Company (Carrollton, TX)
Primary Class(es):
700/4
Other Classes:
US Patent Ref:
Other Refs:
Primary Examiner:
Springborn, Harvey E.
Assistant Examiner:
Attorney:
Naigur; Marvin A., Wilson; John E., Herguth, Jr.; John J.
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