Agent-equipped controller having data table interface between agent-type programming and non-agent-type programming

• US 7,640,291 B2
• Filed: 03/25/2004
• Issued: 12/29/2009
• Est. Priority Date: 12/16/2002
• Status: Expired due to Fees

• Current Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Original Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Inventors: Slechta, Petr, Maturana, Francisco P., Staron, Raymond J., Hall, Kenwood H., Marik, Vladimir, Vrba, Pavel, Tichy, Pavel
• Primary Examiner(s): Nguyen; Van H
• Application Number:
  US10/808,680
• Publication Number:
  US 20040204772A1
• Time in Patent Office: 2,105 Days
• Field of Search: 719/317, 719/320, 709/202, 709/203, 709/223, 700/1, 700/2, 700/18, 700/83, 700/17, 700/34, 700/37, 700/79, 700/86, 700/87, 717/116, 717/108, 717/109, 717/113, 717/114, 717/138, 717/139, 717/162
• US Class Current: 709/202
• CPC Class Codes: G05B 19/4148 characterised by using several processors for different functions, distributed (real-time) systems G05B19/4141 takes precedence
• CPC Class Codes: G05B 2219/33055 Holon, agent executes task and cooperates with other, distributed control
• CPC Class Codes: G05B 2219/33063 Generic coordination, master agent to data manager agent to tasks to active agent
• CPC Class Codes: G05B 2219/33072 Two layer agent for execution of tasks and for communication, coordination
• CPC Class Codes: G05B 2219/33073 Ion control agent has communication, database, suggestion, decision, action, detect
• CPC Class Codes: G06Q 10/04 Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem" market predictions or forecasting for commercial activities G06Q30/0202

Abstract

A controller capable of being employed in a distributed control system, where the distributed control system controls operations of a plurality of devices that operate together to perform a process, and a method of communicating information between a first program portion and a second program portion of such a controller, are disclosed. The controller includes at least one processing component configured to perform a first plurality of program portions that operate in relation with one another as a first agent. The plurality of program portions includes a first program portion that controls agent-type behavior of the controller, and a second program portion that at least one of controls and monitors at least one of the devices. The controller further includes at least one memory component that stores a data table that is accessed by each of the first and second program portions to allow communication between those program portions.

Claims

1. A distributed control system for controlling a distributed process performed by a plurality of devices, the distributed control system comprising:

a first industrial controller including a first processing component and associated with at least a first device;

a first memory device in communication with the first processing component and configured to store a first data table;

at least one input module in communication with the first industrial controller and receiving an input signal from at least one sensor;

at least one output module in communication with the first industrial controller and sending an output signal to at least one actuator;

a first agent application executing on the first processing component;

a first real time control program executing on the first processing component to selectively enable and disable one of the output signals in response to one of the input signals wherein the first agent application and the first real time control program each access the first data table for both reading and writing information relating to the control or status of at least the first device;

a second industrial controller including a second processing component and associated with at least a second device;

a network connecting the first and second industrial controllers to communicate between the first and second industrial controllers;

a second memory device in communication with the second processing component and configured to store a second data table;

at least one input module in communication with the second industrial controller and receiving an input signal from at least one sensor;

at least one output module in communication with the second industrial controller and sending an output signal to at least one actuator;

a second agent application executing on the second processing component; and

a second real time control program executing on the second processing component to selectively enable and disable one of the output signals in response to one of the input signals wherein the second agent application and the second real time control program each access the second data table for both reading and writing information relating to the control or status of at least the second device.

2. The distributed control system of claim 1, wherein the first or second real time control program provides a thread to the first or second agent application, respectively, whenever the first or second real time control program modifies the respective data table, in order to notify the first or second agent application, respectively, that the modifications have occurred.

3. The distributed control system of claim 1, wherein each of the first and second real time control programs is written in ladder logic.

4. The distributed control system of claim 1, wherein each of the first and second agent applications is capable of generating and processing messages written in a language selected from the group consisting of Job Definition Language (JDL), Knowledge Query and Manipulation Language (KQML), and EXtensible Markup Language (XML).

5. The distributed control system of claim 4, wherein the messages generated and processed by the first and second agent applications are wrapped in Foundation for Intelligent Physical Agents (FIPA) Agent Communication Language (ACL) information.

6. The distributed control system of claim 1, further comprising a means for communicating with a third industrial controller of an external organization, wherein the third industrial controller includes a third processing component, wherein the third processing component is configured to execute a third agent application.

7. The distributed control system of claim 6, wherein the first agent application performs at least one of the following actions in response to reading information from the data table that was written to the data table by the first real time control program:

writes at least one of an additional piece of data and an additional event to the data table to cause a change in operation of the first real time control program; and

communicates with at least one of the second or third agent applications to cause a change in operation of the other agent application.

8. The distributed control system of claim 1, wherein the first agent application includes at least one of a planner portion, an execution controller portion, a diagnostics portion, an equipment model portion, an application-specific agent scripts portion and a generic interface portion.

9. The distributed control system of claim 1, wherein the first and second agent applications are configured to conduct negotiations with other agents.

10. The distributed control system of claim 1, wherein first communications between the first real time control program and the first device also occur by way of the first data table, and second communications between the second real time control program and the second device also occur by way of the second data table.