Method and apparatus for a numerical control system for processing multiple job streams

• US 5,984,499 A
• Filed: 09/12/1997
• Issued: 11/16/1999
• Est. Priority Date: 09/12/1997
• Status: Expired due to Term

• Current Assignee: Hurco Companies, Inc.
• Original Assignee: Manufacturing Data Systems, Inc. (Tecumseh Products Co. LLC)
• Inventors: Hutchins, Charles S., Nourse, Bruce E.
• Primary Examiner(s): Grant, William
• Assistant Examiner(s): Marc, McDieunel, Marc, McDieunel
• Application Number:
  US08/928,089
• Time in Patent Office: 795 Days
• Field of Search: 364/474.11, 364/474.31, 364/131-135, 364/474.15, 395/670-678, 395/378, 711/147-153, 707/104
• US Class Current: 700/5
• CPC Class Codes: G05B 19/4145 characterised by using same processor to execute programmable controller and numerical controller function [CNC] and PC controlled NC [PCNC]
• CPC Class Codes: G05B 2219/34279 Pc, personal computer as controller
• CPC Class Codes: G05B 2219/34381 Multitasking
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes
• CPC Class Codes: G06F 9/545 where tasks reside in different layers, e.g. user- and kernel-space

Abstract

A software-based controller implemented on a generic computer hardware platform for dynamically allocating and controlling multiple job streams for anumerically controlling a machine tool. The software-based controller includes a first module for performing a set of first operations corresponding to a first job stream, a second module for performing a set of second operations corresponding to said first job stream, and a third module for performing a set of third operations corresponding to a second job stream. Each of the first, second and third modules are collectively defining a pointer architecture that includes a vertical data system to facilitate communication between operations in the same job stream and a horizontal data system to facilitate communication between operations in different job streams. A shared memory accessible to the first, second and third modules is further defined as having a vertical data structure associated with said vertical data system and a horizontal data structure associated with said horizontal data system. The first, second and third modules communicating through the shared memory by: (a) using the vertical data system to point operations in a common job stream to a first common shared memory location in said vertical data structure; and (b) using the horizontal data system to point operations in a different job streams to a second common shared memory location in said horizontal data structure.

Claims

1. A computer-implemented system to facilitate multiple job streams in a numerically controlled machine, comprising:

a first module for performing a set of first operations corresponding to a first job stream;

a second module for performing a set of second operations corresponding to said first job stream;

a third module for performing a set of third operations corresponding to a second job stream;

said first, second and third modules collectively defining a pointer architecture that includes a vertical data system to facilitate communication between operations in the same job stream and a horizontal data system to facilitate communication between operations in different job streams;

a shared memory accessible to said first, second and third modules, said shared memory having a vertical data structure associated with said vertical data system and a horizontal data structure associated with said horizontal data system; and

said first, second and third modules communicating through said shared memory by;

(a) using said vertical data system to point from operations in a common job stream to a first common shared memory location in said vertical data structure; and

(b) using said horizontal data system to point from operations in different job streams to a second common shared memory location in said horizontal data structure.

2. The apparatus according to claim 1 wherein said vertical data system includes a vertical variable referenced by said first module for mapping to a first pointer associated with said first module, whereby said first pointer maps to said first common shared memory location.

3. The apparatus according to claim 2 wherein said second module references said vertical variable for mapping to a second pointer associated with said second module, whereby said second pointer maps to said first common shared memory location.

4. The apparatus according to claim 2 wherein said first memory location is identified by a unique identifier coupled to an addendum identifier, where addendum identifier is indicative of said first job stream.

5. The apparatus according to claim 1 wherein said horizontal data system includes a horizontal variable referenced by said second module for mapping to a second pointer associated with said second module, whereby said second pointer maps to said second common shared memory location.

6. The apparatus according to claim 5 wherein said third module references said horizontal variable for mapping to a third pointer associated with said third module, whereby said third pointer maps to said second common shared memory location.

7. The apparatus according to claim 5 wherein said second common shared memory location in said horizontal data structure is further defined as an array data structure, where said horizontal variable includes an index for accessing said array data structure.

8. The apparatus according to claim 1 wherein said first module, said second module and said third module are further defined as application modules for performing numerical control tasks.

9. The apparatus according to claim 8 wherein said application modules includes an interrupt handler for interfacing with said numerically controlled machine.

10. The apparatus according to claim 9 wherein said interrupt handler must execute and complete control tasks within said interrupt interval, where said interrupt interval is a predetermined duration for monitoring feedback control signals.

11. The apparatus according to claim 10 further comprising a real time layer having at least one application module that must execute and complete numerical control tasks within said interrupt interval, and a real time database defined in shared memory and accessible by said application modules in said real time layer, where said real time database further includes said vertical data structure associated with said vertical data system and said horizontal data structure associated with said horizontal data system.

12. The apparatus according to claim 10 wherein said application modules in said real time layer includes a first move interpolator associated with a first process and a second move interpolator associated with a second process, each coupled to said interrupt handler for supplying motion commands, a first sequencer associated with said first process coupled to said first move interpolator for issuing motion commands relating to said first process, and a second sequencer, associated with said second process, coupled to second move interpolator for issuing motion commands relating to said second process.

13. The apparatus according to claim 10 further comprising a pre-processing layer having at least one application module that execute control tasks, where execution of said numerical control tasks is longer than said interrupt interval, and a near real time database defined in said shared memory and accessible by said application modules in said pre-processing layer, where said near real time database further includes said vertical data structure associated with said vertical data system and said horizontal data structure associated with said horizontal data system.

14. The apparatus according to claim 13 wherein said application modules of said pre-processing layer includes a first block parser associated with said first process coupled to said first sequencer and a second block parser associated with said second process coupled to said second sequencer, each for converting source code into motion commands.

15. The apparatus according to claim 13 wherein said application modules of said pre-processing layer includes a soft programmable logic controller component coupled to at least one of said first seqencer and said second sequencer for issuing motion commands.

16. The apparatus according to claim 13 further comprising a user interface layer having application modules for capturing user control commands and for initiating transmission of a first message to at least one of said application modules of said pre-processing layer and said application modules of said real time layer.

17. The apparatus of claim 16 wherein said application modules of said user interface layer reside on a first computing unit, and said application modules of said pre-processing layer and application modules of said real time layer reside on a second computing unit, where said first computing unit and said second computing layer are coupled by a network channel.

18. The apparatus of claim 17 wherein said application modules of said pre-processing layer includes a first messager module for at least one of receiving said first message from said application modules of said user interface layer and for accessing said near real time database.

19. A computer-implemented system to facilitate multiple job streams in a numerically controlled machine, comprising:

a first module for performing a set of first operations corresponding to a first job stream;

a second module for performing a set of second operations corresponding to said first job stream;

a third module for performing a set of third operations corresponding to a second job stream;

messenger module communicating with said first, second and third modules that implements a pointer architecture that includes a vertical data system to facilitate communication between operations in the same job stream and a horizontal data system to facilitate communication between operations in different job streams;

a shared memory accessible to said first, second and third modules and said messenger module;

said messenger module defining in said shared memory a vertical data structure associated with said vertical data system and a horizontal data structure associated with said horizontal data system; and

said first, second and third modules communicating with said messenger module through said shared memory;

(a) using said vertical data system to point from operations in a common job stream to a first common shared memory location in said vertical data structure; and

(b) using said horizontal data system to point from operations in different job streams to a second common shared memory location in said horizontal data structure.

20. The apparatus of claim 19 wherein said application modules of said real time layer includes a second messager module for receiving at least one of said first message from application modules of said user interface layer and said second message from said application modules of said real time layer, and for accessing said real time database.

21. The apparatus according to claim 20 wherein said vertical data system includes a vertical variable referenced by said first module for mapping to a first pointer associated with said first module, whereby said first pointer maps to said first common shared memory location.

22. The apparatus according to claim 21 wherein said second module references said vertical variable for mapping to a second pointer associated with said second module, whereby said second pointer maps to said first common shared memory location.

23. The apparatus according to claim 21 wherein said first memory location is identified by a unique identifier coupled to an addendum identifier, where addendum identifier indicative of said first job stream.

24. The apparatus according to claim 20 wherein said horizontal data system includes a horizontal variable referenced by said second module for mapping to a second pointer associated with said second module, whereby said second pointer maps to said second common shared memory location.

25. The apparatus according to claim 24 wherein said third module references said horizontal variable for mapping to a third pointer associated with said third module, whereby said third pointer maps to said second common shared memory location.

26. The apparatus according to claim 24 wherein said second common shared memory location in said horizontal data structure is further defined as an array data structure, where said horizontal variable includes an index for accessing said array data structure.

27. The apparatus according to claim 20 wherein said first module, said second module and said third module is further defined as application modules for performing numerically controlled tasks.

28. The apparatus according to claim 27 wherein said application modules includes an interrupt handler for interfacing with said numerically controlled machine.

29. The apparatus according to claim 28 wherein said interrupt handler must execute and complete control tasks within said interrupt interval, where said interrupt interval is a predetermined duration for monitoring feedback control signals.

30. The apparatus according to claim 29 further comprising a real time layer having application modules that must execute and control tasks with said interrupt interval, and a real time database accessible by said application modules in said real time layer and defined in shared memory and defined in said shared memory, where said real time database further includes said vertical data structure associated with said vertical data system and said horizontal data structure associated with said horizontal data system.

31. The apparatus according to claim 29 wherein said application modules in said real time layer includes a first move interpolator associated with a first process and a second move interpolator associated with a second process, each coupled to said interrupt handler for supplying motion commands, a first sequencer associated with said first process coupled to said first move interpolator for issuing motion commands relating to said first process, and a second sequencer, associated with said second process, coupled to second move interpolator for issuing motion commands relating to said second process.

32. The apparatus according to claim 29 further comprising a pre-processing layer having application modules that execute control tasks, where execution is longer than said interrupt interval, and a near real time database accessible by said application modules in said pre-processing layer and defined in shared memory, where said near real time database further includes said vertical data structure associated with said vertical data system and said horizontal data structure associated with said horizontal data system.

33. The apparatus according to claim 32 wherein said application modules of said pre-processing layer includes a first block parser associated with said first process coupled to said first sequencer and a second block parser associated with said second process coupled to said second sequencer, each for converting source code into motion commands.

34. The apparatus according to claim 32 wherein said application modules of said pre-processing layer includes a soft programmable logic controller component coupled to at least one of said first seqencer and said second sequencer for issuing motion commands.

35. The apparatus according to claim 29 further comprising a user interface layer having application modules for capturing user control commands and initiating transmission of a first message to at least one of said application modules of said pre-processing layer and said application modules of said real time layer.

36. The apparatus according to claim 35 wherein said application modules of said user interface layer reside on a first computing unit, and said application modules of said pre-processing layer and application modules of said real time layer reside on a second computing unit, where said first computing unit and said second computing layer are coupled by a network channel.

37. The apparatus according to claim 35 further comprising a startup module for implementing said pointer architecture by reading a script file and initiating said messager module, whereby based upon commands from said script file said messager module executes said application modules for registering module variables with said messager, blocking said application modules, defining said horizontal data structure and said vertical data structure in said shared memory, reading at least one tune file for setting initial module variables, assigning pointers into said shared memory, and unblocking said application modules, where said application modules get corresponding pointer values from said messager before performing said numerically controlled tasks.

38. The apparatus according to claim 35 wherein said startup module initiates a first messager module for implementing a first pointer architecture in said real time layer, and upon completing implementation of said first pointer architecture initiate a second messager module for implementing said pointer architecture in said pre-processing layer.

39. The apparatus of claim 38 wherein said second messager module of said pre-processing layer facilitates communication by at least one of receiving said first message from said application modules of said user interface layer and for accessing said near real time database.

40. The apparatus of claim 38 wherein said first messager module of said real time layer facilitates communication by receiving at least one of said first message from application modules of said user interface layer and said second message from said application modules of said real time layer, and for accessing said real time database.

41. A computer-implemented method of facilitating multiple job streams in a numerically controlled machine, comprising the steps of:

providing a first module for performing a set of first operations corresponding to a first job stream;

providing a second module for performing a set of second operations corresponding to said first job stream;

providing a third module for performing a set of third operations corresponding to a second job stream;

implementing a pointer architecture that includes a vertical data system to facilitate communication between operations in the same job stream and a horizontal data system to facilitate communication between operations in different job streams;

communicating through a shared memory accessible to said first, second and third modules, said shared memory having a vertical data structure associated with said vertical data system and a horizontal data structure associated with said horizontal data system, whereby said first, second and third modules communicate by;

(a) using said vertical data system to point operations in a common job stream to a first common shared memory location in said vertical data structure; and

(b) using said horizontal data system to point operations in a different job streams to a second common shared memory location in said horizontal data structure.