Modem function incorporated in a programmable logic controller

Details Modem function incorporated in a programmable logic controller Modem function incorporated in a programmable logic controller

2005-08-02

2005-08-02

Woo, Stella (Department: 2643)

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

C379S093290, C379S379000

Reexamination Certificate

active

06925158

ABSTRACT:
At least one exemplary embodiment of the present invention includes a system comprising a modem adapted to be integrated into a programmable logic controller and adapted to facilitate communications with a main processor of the programmable logic controller via a communications medium. At least one exemplary embodiment of the present invention includes a method comprising receiving a message from a main processor of a programmable logic controller, modulating the message within the programmable logic controller, and transmitting the message via a communications network. At least one exemplary embodiment of the present invention includes a method comprising receiving a message at a programmable logic controller from a communications network, demodulating the message within the programmable logic controller, and delivering the message to a main processor of the programmable logic controller. 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: 4841561 (1989-06-01), Hill
patent: 2001/0037491 (2001-11-01), Boggs, et al.
patent: 0 340 613 (1989-11-01), None
Patent Cooperation Treaty.
PCT International Search Report of PCT/US 02/38485 dated May 16, 2003 and received May 19, 2003.

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