Modular I/O equipment for controlling field devices directly or

Details Modular I/O equipment for controlling field devices directly or Modular I/O equipment for controlling field devices directly or

1975-04-07

1978-04-25

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340163, 340147LP, H04Q 900

Patent

active

040865681

ABSTRACT:
Signals for controlling any of a wide variety of field devices such as circuit breakers, generators, transformer connections and the like are produced from a common function module. The particular device or devices to be operated are selected on an exclusive basis by a control module dedicated for that purpose. The control module cooperates with the common function module to produce the desired control and/or monitoring of the associated field devices and prevents any other control module from operating when it is selected. Exclusive operation is effected by an interruptible serial connection of a power line between control modules. A multiplexing arrangement switches the pertinent measurement data associated with a selected operation into a display panel. The combined modules provide direct control of all field devices at a remote location but can also be controlled by a distant supervisory equipment. A common basic circuit configuration for the control modules permits tailoring the selected functions by relatively simple addition of circuit elements.

REFERENCES:
patent: 3593290 (1971-07-01), Kerr
patent: 3641326 (1972-02-01), Harte
patent: 3688262 (1972-08-01), Liquori
patent: 3689887 (1972-09-01), La Falce
patent: 3742148 (1973-06-01), Ledeen
patent: 3919461 (1975-11-01), Hunting
patent: 3950728 (1976-04-01), Etchison

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