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AssigneeAllen-Bradley Company, Inc.
InventorsMark A. Flood, Michael D. Kalan, Charles M. Rischar, Robert R. Sepsi, Jack F. Toma
Estimating the term…
A programmable controller governs the operation of a piece of equipment by executing machine language instructions compiled from a ladder diagram type control program. The control program as stored in the controller includes not only compiled machine language instructions, but also a tokenized version of the source code from which certain machine language instructions were compiled. The source code is provided only for those portions of the machine language program which cannot be easily decompiled to produce the corresponding source code. This program storage facilitates subsequent editing of the stored program via a terminal connected to the programmable controller. During the editing process, the original ladder diagram can be reconstructed from a combination of the machine language instructions and the tokenized version of the source code. In doing so, the machine language instructions, which have a one-to-one correspondence with the source code instructions, are decompiled using conventional techniques. However, the tokenized version of the source code is used to recreate the portions of the ladder diagram for which each machine language instruction does not have a unique one-to-one correspondence with a source code instruction. This program storage technique enables the control program to be easily edited using the version stored in the programmable controller without requiring access to the original source code from which the program was compiled.
In a programmable logic controller for use in executing an object code control program including a plurality of contiguous program data sectors which correspond to sequential program steps and which include a first section containing general purpose processor instructions and a second section containing tokenized source code information statements for accurately reconstructing source code instructions corresponding to said general purpose processor instructions for program editing purposes, a method for processing said control program at run time for control execution and during program decompiling for full source code reconstruction comprising the steps of:
In a programmable logic controller for use in executing an object code control program including a plurality of contiguous program data sectors which correspond to sequential program steps and which include a first section containing special purpose co-processor instructions having one-to-one relationship with source code instructions, a second section containing general purpose co-processor instructions and a third section containing source code information for accurately reconstructing source code instructions corresponding to said general purpose co-processor instructions for program editing purposes, a method for processing said control program at run time for control execution and during program decompiling for full source code reconstruction compromising the steps of:
In a programmable logic controller for use in executing an object code control program including a plurality of contiguous program data sectors which correspond to sequential program steps and which include a first section containing special purpose co-processor instructions having one-to-one relationships with source code instructions, a second section containing general purpose co-processor instructions and a third section containing source code information for accurately reconstructing source code instructions corresponding to said general purpose co-processor instructions for program editing purposes, a system for processing said control program at run time for control execution and during program decompiling for full source code reconstruction comprising:
Dependencies are inferred from the claim text.