Publication distribution system

Details Publication distribution system Publication distribution system

1999-02-26

2002-04-02

Teska, Kevin J. (Department: 2121)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

C700S127000

Reexamination Certificate

active

06366826

ABSTRACT:

INTRODUCTION
The present invention is directed to a publication distribution system and, more specifically to a computer operated feedback control system for controlling a process such as a paper-making machine.
BACKGROUND
FIG. 1
illustrates a prior control process which while specifically related to the paper-making industry might occur in any type of computer control system where several sources of data (termed a Publisher) is desired by several Subscribers. As illustrated in
FIG. 1
, as specifically applied to the paper-making industry, there is a central computer
10
where in a star-type system having the data path
11
,
12
and
13
all of which go to the input port, indicated generally at
14
of the computer. Thus, this may be a choke point or bottleneck in the system. On data line
13
, a so-called Publisher in the form of sensors sense among other parameters of a paper-making process, moisture and basis weight. This is usually done by scanners which scan in a cross direction across the width of the paper being manufactured and provides data for every “slice” of the paper. Thus, for every scan there is a significant data output. To control moisture and basis weight to desired set points and provide quality control, the feedback control system and computer
10
receives this data and by the use of actuators
17
and
18
on the data lines
11
and
12
individually control basis weight (for example, the headbox openings of the paper-making machine are controlled) or moisture (see actuator
18
). Moisture may be controlled in several ways by controlling steam valves or actually spraying water on the paper sheet. In addition, there are other parameters such as caliper and gloss of the paper which can be controlled in the same feedback control manner. Thus, in summary with the prior art star system of
FIG. 1
there is a large amount of data going to the central computer and a single node of the computer must listen to all of the communications coming from each of the legs of the star, that is,
11
,
12
and
13
. And in the case of sensors
16
since data is normally polled, the whole array of data is transferred; that is, for each scan an entirely new array of data must be transferred and processed.
OBJECT AND SUMMARY OF INVENTION
It is therefor a general object of the present invention to provide an improved publication distribution system.
In accordance with the above object, there is provided a computer operated feedback control system for controlling a process comprising an effective common data bus. A plurality of Publisher means is connected to the data bus for sensing a variable parameters of the process and respectively storing data related to such parameter. A plurality of Subscriber means is connected to the data bus for receiving data from a selected Publisher means. Means are provided for transmitting to the Subscriber means from the selected Publisher means only that portion of data which has been changed from a value prior in time.


REFERENCES:
patent: 4680753 (1987-07-01), Fulton et al.
patent: 4980846 (1990-12-01), Chapman
patent: 5452201 (1995-09-01), Pieronek et al.
patent: 6086716 (2000-07-01), Watson et al.
Cavalieri et al., Impact of fieldbus on communication in robotic systems, Feb. 1997, IEEE, vol. 13, issue 1, 30-48.

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