Apparatus for tracking predetermined data for updating a seconda

Details Apparatus for tracking predetermined data for updating a seconda Apparatus for tracking predetermined data for updating a seconda

1989-01-23

1990-09-25

MacDonald, Allen

Boots, shoes, and leggings

371 91, G06F 1120

Patent

active

049597680

ABSTRACT:
A process control system includes a primary processor connected to a primary memory via a bus. The primary processor transfers data to be stored to said primary memory. An apparatus of the present invention connected to the bus, collects predetermined data of the data being transferred simultaneously with the transfer of the data to the primary memory. The predetermined data collected by the apparatus is subsequently transferred to a backup processor controller to update the data base of the backup process controller. The apparatus comprises a storage element which stores the data collected. A logic unit controls the operation of the apparatus including the collection of the predetermined data. A control unit of the apparatus transfers the predetermined data stored in the storage element to the backup process controller.

REFERENCES:
patent: 4031372 (1977-06-01), Davis
patent: 4351023 (1982-09-01), Richer
patent: 4581701 (1986-04-01), Hess et al.
patent: 4751702 (1988-06-01), Beier et al.

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