Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1995-11-20
1999-11-09
An, Meng-Ai T.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
710102, 710 2, 713300, 714 48, 439 43, G06F 1300
Patent
active
059832983
ABSTRACT:
A circuit card of an industrial controller may be removed or inserted under power without loss of memory or disturbance to the power supplies of other modules through the use of a power failure signal derived from shortened pins on the connector between the card and the industrial controller. The power failure signal activates a timer delaying connection of the board components to power until the physical connection between the card and the industrial controller has stabilized. At this time current drain is ramped up by a controlling series FET. Upon removal of the card, the power failure signal causes outputs of an on-board microprocessor to be pulled to particular states necessary to prevent disturbance of a battery backed-up RAM and to eliminate current flow through protection diodes on other memory type devices attached to the microprocessor.
REFERENCES:
patent: 4882702 (1989-11-01), Struger et al.
patent: 5537584 (1996-07-01), Miyai et al.
patent: 5568610 (1996-10-01), Brown
patent: 5589719 (1996-12-01), Fiset
Floro William E.
Schmidt Otomar
Schultz Ronald E.
Allen-Bradley Company LLC
An Meng-Ai T.
Baxter Keith M.
Dharia Rupal D.
Horn John J.
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