PLC to PLC communications with a modem on the PLC I/O bus

Electrical computers and digital processing systems: multicomput – Network-to-computer interfacing

Reexamination Certificate

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Details

C709S205000, C709S217000, C709S220000

Reexamination Certificate

active

07124206

ABSTRACT:
At least one exemplary embodiment of the present invention includes a system comprising a first modem integral to a first programmable logic controller, and a second modem integral to a second programmable logic controller, the first modem adapted to communicate with the second modem via a communications network. At least one exemplary embodiment of the present invention includes a method comprising coupling a first modem to a second modem, the first modem integral to a first programmable logic controller, the second modem connected to a second programmable logic controller, and transferring data between the first modem and the second modem. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. This abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

REFERENCES:
patent: 5541955 (1996-07-01), Jacobsmeyer
patent: 6567709 (2003-05-01), Malm et al.
patent: 6745090 (2004-06-01), Malizia, Jr.
patent: 6745254 (2004-06-01), Boggs et al.
patent: 2001/0037491 (2001-11-01), Boggs et al.
patent: 0 340 613 (1989-11-01), None
PCT International Search Report of PCT/US 02/38043 dated May 16, 2003 and received May 19, 2003.

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