Process control system with improved system security features

Details Process control system with improved system security features Process control system with improved system security features

1980-04-11

1982-09-21

Ruggiero, Joseph F.

Boots, shoes, and leggings

364134, 371 9, G06F 1546, G06F 1116

Patent

active

043510230

ABSTRACT:
A process control system includes two digital controllers each capable of exercising direct digital control over the process. One of the controllers is selected to be on-control, the other serving as a backup. A separate data buffer memory connected to both controllers stores the most recent static and dynamic data base of the on-control controller which is transferred to the backup controller. In the event of failure or other loss of service, the backup automatically acquires control with an up-to-date data base resulting in a smooth transition. Provisions are also included to have the backup controller examine the health of the on-control unit before deciding whether or not to accept the data buffer contents thereby reducing the likelihood of corrupted data being fed to the backup.

REFERENCES:
patent: 3303474 (1967-02-01), Moore et al.
patent: 3377623 (1968-04-01), Reut et al.
patent: 3636331 (1972-01-01), Amrehn
patent: 3786433 (1974-01-01), Notley et al.
patent: 4123794 (1978-10-01), Matsumoto
patent: 4208715 (1980-06-01), Kumuhara et al.

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