Communications network for programmable controllers

Details Communications network for programmable controllers Communications network for programmable controllers

1982-02-24

1984-10-16

Thomas, James D.

Boots, shoes, and leggings

G06F 300, G06F 1516

Patent

active

044778821

ABSTRACT:
Programmable controllers are connected in a ring by serial data links. Each controller periodically transmits information packets on the ring which contain its I/O image table data. All controllers on the ring receive such data and store it in their data tables, and such data is thus available for examination by each controller processor during its execution of the user's control program.

REFERENCES:
patent: 4019176 (1977-04-01), Cour et al.
patent: 4034351 (1977-07-01), Takezoe
patent: 4195351 (1980-03-01), Barner et al.
patent: 4215396 (1980-07-01), Henry et al.
patent: 4319338 (1982-03-01), Grudowski et al.
patent: 4354226 (1982-10-01), Flickinger et al.
patent: 4363093 (1982-12-01), Davis et al.
Scientific American, Jun. 1979, "Automatic Control by Distributed Intelligence" by Stephen Kahne, Irving Lefkowitz and Charles Rose, pp. 78-90.
Control Engineering, Sep. 1979, "Communications and Data Highways: PC's Lead the Way" by Kenneth Pluhar, pp. 65-;68.

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