Programmable logic controller programming system

• US 7,272,451 B2
• Filed: 12/01/2005
• Issued: 09/18/2007
• Est. Priority Date: 01/30/2001
• Status: Expired due to Term

• Current Assignee: David W. Duemler
• Original Assignee: David W. Duemler
• Inventors: Duemler, David W.
• Primary Examiner(s): BARNES-BULLOCK, CRYSTAL JOY
• Application Number:
  US11/293,710
• Publication Number:
  US 20060085085A1
• Time in Patent Office: 656 Days
• Field of Search: 700/5, 700/7, 700/11, 700/12, 700/17, 700/18, 700/19, 700/20, 700/21, 700/80, 700/83, 700/86, 700/87, 700/88, 703/24, 710/4, 710/5, 710/8, 710/9, 710/14, 710/15, 710/18, 710/19, 714/46, 715/764, 715/965, 715/966, 715/967, 715/970
• US Class Current: 700/18
• CPC Class Codes: G05B 19/056 Programming the PLC
• CPC Class Codes: G05B 2219/13145 Graphical input of network of symbols, simulation on screen, translate to machine
• CPC Class Codes: Y10S 715/967 Visual or iconic programming
• CPC Class Codes: Y10S 715/97 Instrumentation and component modelling, e.g. interactive control panel

Abstract

A programming system includes a graphical data entry user interface for a plurality of sequential steps displayed to a user on a monitor. The user selects outputs to be activated for each of the sequential steps and any inputs to be monitored or timer to be enabled for the sequential steps. The inputs, outputs, and timer enable commands, and timer values identified by the user are converted into data tables each having a plurality of data elements. Each data element corresponds to one of the sequential steps. A programmable logic controller directs a process by reading the data elements corresponding to a sequential step and, for that sequential step, activating the outputs identified by the output data element, monitoring any inputs identified by the input control data element, and enabling a timer for a selected time period if identified in the input control data element.

Claims

1. A method of controlling a process with a programmable logic controller, said programmable logic controller including a plurality of inputs and a plurality of outputs, said programmable logic controller directing said process through signals at said outputs in response to input signals at said inputs, comprising the steps of:

accessing with said programmable logic controller an input control data element for a sequential step from said process and an output data element for said sequential step from an input control data table and an output data table, respectively, said input control data table including input control data elements for a plurality of sequential steps from said process and said output data table including a plurality of output data elements for said plurality of sequential steps;

providing output signals at outputs of said programmable logic controller identified by said output data element to be activated for said sequential step;

monitoring inputs identified by said input control data element to be monitored for said sequential step; and

performing a next one of said plurality of sequential steps if an input signal is detected for at least one of said monitored inputs.

2. The method of claim 1, wherein at least one input control data element represents a timer enable command for a respective one of said plurality of sequential steps, said method further comprising the steps of:

accessing with said programmable logic controller a timer value from a timer value data table for said sequential step;

enabling a timer for a time period indicated by said timer value for said sequential step; and

performing a next sequential step when said time period expires.

3. The method of claim 2, wherein said input control data element includes a plurality of bits and a subset of said plurality of bits represents individual inputs of said programmable logic controller and at least one of said subset of bits represents said timer enable command.

4. The method of claim 1, wherein said input control data element includes a plurality of bits and a subset of said plurality of bits represents individual inputs of said programmable logic controller.

5. The method of claim 1, wherein said input control data element and said output data element are accessed from a local storage medium.

6. The method of claim 1, wherein said output data element includes a plurality of bits and a subset of said plurality of bits represents individual outputs of said programmable logic controller.

7. The method of claim 1, further comprising the steps of:

creating said input control data table; and

creating said output data table.

8. The method of claim 7, wherein said steps of creating said input control data table and said output data table include the following steps:

displaying to a user on a monitor a graphical data entry user interface for a plurality of sequential steps to be directed by said programmable logic controller, said graphical data entry user interface representing respective inputs to be monitored by said programmable logic controller at each of said sequential steps and respective outputs to be initiated by said programmable logic controller at respective ones of said sequential steps;

receiving for said process, via said graphical data entry user interface, an identification of at least one input selected by said user to be monitored for at least one of said sequential steps and an identification of at least one output selected by said user to be initiated for said at least one of said sequential steps;

converting said identification of said at least one input selected by said user into said input control data table; and

converting said identification of said at least one output selected by said user into said output data table.

9. The method of claim 8, wherein said graphical data entry user interface includes a timer enable command option for each of said plurality of sequential steps and a timer value option for each of said plurality of sequential steps.

10. The method of claim 9, further comprising the steps of:

receiving, via said graphical data entry user interface, a selection by said user of a timer enable command for at least one of said plurality of sequential steps;

receiving, via said graphical data entry user interface, a selection by said user of a timer value for said one of said plurality of sequential steps; and

creating a timer value data table including at least one timer value data element, said timer value data element representing said timer value.

11. The method of claim 10, wherein at least one input control data element represents a timer enable command for a respective one of said plurality of sequential steps, said method further comprising the steps of:

accessing with said programmable logic controller a timer value from a timer value data table for said sequential step;

enabling a timer for a time period indicated by said timer value for said sequential step; and

performing a next sequential step when said time period expires.

12. A programmable logic controller system for controlling a process, said programmable logic controller comprising:

a plurality of inputs and a plurality of outputs, said programmable logic controller directing said process via signals provided at said outputs in response to input signals at said inputs;

means for accessing with said programmable logic controller an input control data element for a sequential step from said process and an output data element for said sequential step from an input control data table and an output data table, respectively, said input control data table including input control data elements for a plurality of sequential steps from said process and said output data table including a plurality of output data elements for said plurality of sequential steps;

means for providing output signals at outputs of said programmable logic controller identified by said output data element to be activated for said sequential step;

means for monitoring inputs identified by said input control data element to be monitored for said sequential step; and

means for performing a next one of said plurality of sequential steps if an input signal is detected for at least one of said monitored inputs.

13. The programmable logic controller system of claim 12, wherein at least one input control data element represents a timer enable command for a respective one of said plurality of sequential steps, said programmable logic controller further comprising:

means for accessing a timer value from a timer value data table for said sequential step;

means for enabling a timer for a time period indicated by said timer value for said sequential step; and

means for performing a next sequential step when said time period expires.

14. The programmable logic controller system of claim 13, wherein said input control data element includes a plurality of bits and a subset of said plurality of bits represents individual inputs of said programmable logic controller and at least one of said subset of bits represents said timer enable command.

15. The programmable logic controller system of claim 12, wherein said input control data element includes a plurality of bits and a subset of said plurality of bits represents individual inputs of said programmable logic controller.

16. The programmable logic controller system of claim 12, wherein said input control data element and said output data element are accessed from a local storage medium.

17. The programmable logic controller system of claim 12, wherein said output data element includes a plurality of bits and a subset of said plurality of bits represents individual outputs of said programmable logic controller.

18. The programmable logic controller system of claim 12, further comprising:

means for creating said input control data table; and

means for creating said output data table.

19. The programmable logic controller system of claim 18, wherein said means for creating said input control data table and said output data table include the following:

means for displaying to a user on a monitor a graphical data entry user interface for a plurality of sequential steps to be directed by said programmable logic controller, said graphical data entry user interface representing respective inputs to be monitored by said programmable logic controller at each of said sequential steps and respective outputs to be initiated by said programmable logic controller at respective ones of said sequential steps;

means for receiving, via said graphical data entry user interface, an identification of at least one input selected by said user to be monitored for at least one of said sequential steps and an identification of at least one output selected by said user to be initiated for said at least one of said sequential steps;

means for converting said identification of said at least one input selected by said user into said input control data table; and

means for converting said identification of said at least one output selected by said user into said output data table.

20. The programmable logic controller system of claim 19, wherein said graphical data entry user interface includes a timer enable command option for each of said plurality of sequential steps and a timer value option for each of said plurality of sequential steps.

21. The programmable logic controller system of claim 20, further comprising:

means for receiving, via said graphical data entry user interface, a selection by said user of a timer enable command for at least one of said plurality of sequential steps;

means for receiving, via said graphical data entry user interface, a selection by said user of a timer value for said one of said plurality of sequential steps; and

means for creating a timer value data table including at least one timer value data element, said timer value data element representing said timer value.

22. The programmable logic controller system of claims 21, wherein at least one input control data element represents a timer enable command for a respective one of said plurality of sequential steps, wherein said programmable logic control further comprises:

means for accessing a timer value from a timer value data table for said sequential step;

means for enabling a timer for a time period indicated by said timer value for said sequential step; and

means for performing a next sequential step when said time period expires.

23. A method of controlling a process with a programmable logic controller, said programmable logic controller including a plurality of inputs and a plurality of outputs, said programmable logic controller directing said process through signals at said outputs in response to input signals at said inputs, said process comprising a plurality of sequential steps, comprising the steps of:

(a) accessing with said programmable logic controller an input control data element for a sequential step from said process from an input control data table and an output data element for said sequential step from an output data table, said input control data table including respective input control data elements corresponding to said plurality of sequential steps from said process and said output data table including respective output control data elements corresponding to said plurality of sequential steps, said input control data elements identifying inputs to be monitored during respective sequential steps and said output data elements identifying outputs to be triggered during respective sequential steps;

(b) providing output signals at outputs of said programmable logic controller identified by said output data element to be activated for said sequential step;

(c) monitoring inputs identified by said input control data element to be monitored for said sequential step; and

(d) if an input condition identified by said input control data element to be monitored for said sequential step is detected, repeating steps (a) to (c) for a next sequential step from said process.