Local equipment controller for computerized process control applications utilizing language structure templates in a hierarchical organization and method of operating the same

• US 5,371,895 A
• Filed: 09/30/1991
• Issued: 12/06/1994
• Est. Priority Date: 10/08/1985
• Status: Expired due to Fees

• Current Assignee: Invensys Systems Incorporated (Invensys PLC)
• Original Assignee: The Foxboro Company (Schneider Electric SE)
• Inventors: Bristol, Edgar H.
• Primary Examiner(s): Bowler, Alyssa H.
• Assistant Examiner(s): GECKIL, MEHMET B
• Application Number:
  US07/769,116
• Time in Patent Office: 1,163 Days
• Field of Search: 395/800, 395/159, 364/138, 364/139, 364/198, 364/191
• US Class Current: 717/136
• CPC Class Codes: G05B 19/0426 Programming the control sequence
• CPC Class Codes: G05B 2219/23258 GUI graphical user interface, icon, function bloc editor, labview
• CPC Class Codes: G05B 2219/23261 Use control template library
• CPC Class Codes: G05B 2219/23266 Compiler
• CPC Class Codes: G05B 2219/23274 Link graphical data for display automatically into program
• CPC Class Codes: Y10S 715/965 for process control and configuration

Abstract

A computer controlled equipment controller and method of operating the same for controlling industrial process control equipment which uses a language structure and data structure specifically adapted for use in constructing computer programs for controlling chemical and physical processing. A translator converts to compilable code programs written as statements expressing control intentions or results. Provision is made for treating the program structure (i.e., control connections, program order, and components, etc.) as part of the dynamic state of the application. Graphical symbols, or icons, are employed to draw the eye to critical features in the control program and to lead the eye through critical interrelationships among the several commands of a control system. At the same time, the translator treats the keystrokes generating these icons as statements (i.e., commands) which define the relationships among other associated program statements (which are usually textual commands) to control the order in which the operations represented by those statements are executed.

Claims

1. A computer controlled industrial process controller for controlling a single vessel processing unit, comprising:

a computer;

means for programing the computer using a language structure organized in a hierarchy of control function and having language structure templates which define standardized forms of process control, the language structure further comprising natural language statements reflecting process control intentions used in the language structure templates wherein the process control intentions specify process control objectives without specifying detailed, implementing calculations;

means, within the controller, for translating the language structure templates into executable program code, which code automatically provides control connections among the language structure templates;

means, within the controller, for translating the natural language statements reflecting process control intentions into program code executable by the computer;

means, within the controller, for executing the program code to control production of a product in the single vessel processing unit;

wherein the language structure templates include structures, called loop statement expressions, which are translated into program code and executed by the means for executing for controlling a measured process variable by manipulating at least one manipulated variable according to a predetermined idiom function;

wherein the loop statement expression comprises the measured process variable, the predetermined idiom function, and the at least one manipulated variable; and

wherein the language structure templates and the natural language statements are translated into a string of footnotes and associated attributes in a sequence defining an order of execution of the program code, each footnote defining a calculation to be performed.

2. The controller of claim 1, wherein the hierarchy of control function comprises a three-level hierarchy providing sequencing and coordination at a first level, continuous loop control at a second level, and I/O point operation at a third level.

3. The controller of claim 1, wherein the loop statement expressions include graphical icons reflecting control intentions.

4. The controller of claim 1, wherein the language structure templates include structures, called theme statements, which are translated into program code and executed by the means for executing, for providing overall control of production of the product, the theme statements each including at least one distinguishing natural language keyword reflecting a control intention and defining a process to be performed, and at least one variable, operatively associated with the keyword to be manipulated according the defined process.

5. A method of operating a computer controlled industrial process controller for controlling a single vessel processing unit, comprising the steps

providing a computer;

providing a language structure for programming the computer, the language structure organized in a hierarchy of control function and having language structure templates which define standardized forms of process control, the language structure further comprising natural language statements reflecting process control intentions used in the language structure templates wherein the process control intentions specify process control objectives without specifying detailed, implementing calculations;

translating, by the controller, the language structure templates into executable program code, which code automatically provides control connections among the language structure templates;

translating, by the controller, the natural language statements reflecting control intentions into program code executable by the computer;

executing, by the controller, the program code to control production of a product in the single vessel processing unit;

wherein the language structure templates include structures, called loop statement expressions, which are translated into program code and executed by the controller for controlling a measured process variable by manipulating at least one manipulated variable according to a predetermined idiom function;

wherein the loop statement expression comprises the measured process variable, the predetermined idiom function, and the at least one manipulated variable; and

wherein the steps of translating the language structure templates and translating the natural language statements include translating the templates and statements into a string of footnotes and associated attributes in a sequence defining an order of execution of the program code, each footnote defining a calculation to be performed.

6. The method of claim 5, wherein the step of translating into a string of footnotes and attributes includes translating the footnotes and attributes into a continuous sequential string of typecodes, each typecode containing the footnote calculation and a code identifying a type of calculation and data to be used by the calculation.

7. The method of claim 6, wherein the step of executing the program code includes executing, during a sample time of the controller, the string of typecodes and data starting at a beginning of the string and step by step scanning through the string, performing each calculation in the order in which each calculation is encountered in the string until the end of the string is encountered, returning to the beginning of the string and repeating the step by step scan.

8. The method of claim 7, further comprising the step of generating displays indicative of system operations from the string of typecodes and data during scanning.

9. The method of claim 5, wherein the language structure templates include graphical icons reflecting control intentions and defining a relationship among program elements.

10. The method of claim 5, wherein the step of controlling production of a product further comprises controlling at least one parameter of a process carried out in the single vessel processing unit.