US 10,303,148 B2Granted

Automatic compression algorithm selection and parameter tuning based on contextual knowledge

AssigneeSiemens Aktiengesellschaft

InventorsJuan L. Aparicio Ojea, Justinian Rosca, Lingyun Wang

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Abstract

A method of compressing signal data in an intelligent programmable logic controller includes the controller creating a process image area in a volatile computer-readable storage medium operably coupled to the controller. The intelligent programmable logic controller updates the process image area with contents comprising signal data associated with a production unit and applies a compression algorithm to the contents to generate compressed signal data. The compressed signal data is stored on a non-volatile computer-readable storage medium operably coupled to the controller. The controller annotates the signal data with automation system context information to generate contextualized data. Next, the controller performs a statistical comparison of the signal data and the compressed signal data to generate statistical comparison results. Then, one or more compression parameters used by the compression algorithm may be automatically adjusted based on at least one of the statistical comparison and the contextualized data.

Claims18

Dependent claims

A method of compressing signal data in a programmable logic controller, the method comprising:

creating, by the programmable logic controller, a process image area in a volatile computer-readable storage medium operably coupled to the programmable logic controller;
updating, by the programmable logic controller, the process image area with contents comprising signal data associated with a production unit;
applying, by the programmable logic controller, a compression algorithm to the contents of the process image area to generate compressed signal data;
storing, by the programmable logic controller, the compressed signal data on a non-volatile computer-readable storage medium operably coupled to the programmable logic controller;
annotating, by the programmable logic controller, the signal data with automation system context information to generate contextualized data;
performing, by the programmable logic controller, a statistical comparison of the signal data and the compressed signal data to generate statistical comparison results;
and
automatically adjusting, by the programmable logic controller, one or more compression parameters used by the compression algorithm based on at least one of the statistical comparison and the contextualized data;
selecting, by the programmable logic controller, a new compression algorithm based on the one or more compression parameters;
updating, by the programmable logic controller, the process image area with new contents comprising new signal data associated with the production unit;
applying, by the programmable logic controller, the new compression algorithm to the new contents of the process image area to generate new compressed signal data;
and
storing, by the programmable logic controller, the new compressed signal data on the non-volatile computer-readable storage medium operably coupled to the programmable logic controller.

10 more elements

An programmable logic controller comprising:

a processor configured to execute according to a scan cycle;
a volatile computer-readable storage medium comprising a process image area;
a non-volatile computer-readable storage medium;
and
a plurality of controller components executed by the processor according to the scan cycle, the plurality of controller components comprising:
a data transfer component configured to update the process image area during each scan cycle with contents comprising signal data associated with a production unit,
a contextualization component configured to annotate the signal data with automation system context information to generate contextualized data,
a historian component configured to:
(i) apply a compression algorithm to the contents of the process image area during each scan cycle to generate compressed signal data,
(ii) store the compressed signal data on the non-volatile computer-readable storage medium,
(iii) perform a statistical comparison of the signal data and the compressed signal data to generate statistical comparison results, and
(iv) automatically adjust one or more compression parameters used by the compression algorithm based on at least one of the statistical comparison and the contextualized data.

9 more elements

An article of manufacture for compressing signal data in an programmable logic controller, the article of manufacture comprising a non-transitory, tangible computer-readable medium holding computer-executable instructions for performing a method comprising:

creating a process image area in a volatile computer-readable storage medium operably coupled to the programmable logic controller;
updating the process image area with contents comprising signal data associated with a production unit;
applying a compression algorithm to the contents of the process image area to generate compressed signal data;
storing the compressed signal data on a non-volatile computer-readable storage medium operably coupled to the programmable logic controller;
annotating the signal data with automation system context information to generate contextualized data;
performing a statistical comparison of the signal data and the compressed signal data to generate statistical comparison results;
automatically adjusting one or more compression parameters used by the compression algorithm based on at least one of the statistical comparison and the contextualized data;
selecting a new compression algorithm based on the one or more compression parameters;
updating the process image area with new contents comprising new signal data associated with the production unit;
applying the new compression algorithm to the new contents of the process image area to generate new compressed signal data;
and
storing the new compressed signal data on the non-volatile computer-readable storage medium operably coupled to the programmable logic controller.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/522,449Filed 29 Oct 2014
Published: US 2017/0315531 A12 Nov 2017
Granted: 28 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G05B 19/05
Program control other than numerical control, i.e. in sequence controllers or logic controllers: programmable logic controllers, e.g. simulating…
G05B 19/4183
Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible…:…
G05B 2219/13103
Plc programming: adaptive selftuning regulator
G05B 2219/14055
Plc safety: make log, journal, history file of state changes