US 6,301,610 B1 · Communication system

Abstract

A communication system includes a first communication device, a second communication device, and a communication channel, such as modems and a telephone line, between the devices. The first device includes: a first memory for storing first information, a first processor, and a first communication controller for transmitting a message. The first processor periodically determines a plurality of values, and a count of any of those values which changed after a previous determination of those values. The first processor also alternatively selects for transmission in the message, as a function of the count, either (i) all of the values, or (ii) the values which changed. The second device includes: a second memory for storing second information, a second communication controller for receiving the message, and a second processor. The second processor alternatively updates the stored second information with either (i) all of the values, or (ii) the values which changed of the message. The second processor also processes the stored second information.

Claims22

Dependent claims

A communication system comprising:

a first communication device including:
first memory means for storing first information,
first processor means (a) for repetitively determining a plurality of values as at least some of said first information, (b) for determining a count of any of said values which changed after a previous determination of said values, and (c) for alternatively selecting for communication in a message, as a function of said count, either (i) all of said values, or (ii) said any of said values, and
first communication means for communicating said message;
a second communication device including:
second memory means for storing second information,
second communication means for communicating said message, and
second processor means (a) for alternatively updating said stored second information with either (i) all of said values, or (ii) said any of said values of said message, and (b) for processing at least some of said stored second information of said second memory means;
and
a communication channel between said first and second communication means.

7 more elements

A communication system comprising:

a first programmable logic controller including:
first memory means for storing first information,
first processor means (a) for repetitively determining a plurality of values as at least some of said first information, (b) for determining which ones of said values changed after a previous determination of said values, and (c) for selecting for communication in a message said ones of said values which changed, and
first communication means for communicating said message;
a second programmable logic controller including:
second memory means for storing second information,
second communication means for communicating said message, and
second processor means (a) for updating said stored second information with said ones of said values which changed, and (b) for processing at least some of said stored second information of said second memory means;
and
means for communicating information between said first and second communication means.

7 more elements

Dependencies are inferred from the claim text.

Communication system

Life of this patent

Communication system

Life of this patent

Abstract

Claims22