Industrial controller having redundancy and using connected mess

Details Industrial controller having redundancy and using connected mess Industrial controller having redundancy and using connected mess

1997-06-18

1999-10-05

An, Meng-Ai T.

Boots, shoes, and leggings

714 6, 36414002, G06F 1116

Patent

active

059634480

ABSTRACT:
A redundant controller employs connection-based messaging to ensure reliability and determinacy in communications. The need to close connections and reopen connections with a backup module when control switches from a primary controller to a secondary controller is eliminated by keeping the secondary controller updated as to the connections that have been opened and having the secondary controller assume the connection identification numbers of the primary controller upon switch-over.

REFERENCES:
patent: 4956270 (1990-09-01), McLaughlin et al.
patent: 5093824 (1992-03-01), Coan et al.
patent: 5313386 (1994-05-01), Cook et al.
patent: 5485455 (1996-01-01), Dobbins et al.
patent: 5649089 (1997-07-01), Kilner

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