System for sharing data between microprocessor based devices

Details System for sharing data between microprocessor based devices System for sharing data between microprocessor based devices

1990-03-22

1993-09-14

Heckler, Thomas M.

Boots, shoes, and leggings

364136, 364DIG2, 3649269, 3649409, 364949, 36494062, G06F 1546

Patent

active

052457044

ABSTRACT:
A system allows for transferring messages between microprocessor based devices, such as programmable logic controllers (PLC), and a host computer over an Ethernet communications network. At the host computer level, these messages can be directed globally or locally. The host computer can immediately obtain messages from a programmable logic controller without interruption of the execution of the PLC's ladder program. The host computer can also receive unsolicited messages from the PLC.

REFERENCES:
patent: 4402046 (1983-08-01), Cox et al.
patent: 4835674 (1989-05-01), Collins et al.
patent: 4897777 (1990-01-01), Janke et al.
patent: 4926375 (1990-05-01), Mercer et al.
patent: 5072374 (1991-12-01), Sexton et al.
patent: 5131092 (1992-07-01), Sackmann et al.

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