Patent
1995-11-01
1998-07-14
Trammell, James P.
39518203, 39518206, G06F 944
Patent
active
057817766
ABSTRACT:
A method of editing a real-time control program as it controls equipment is provided in which the editing occurs in a second area of memory and integrated into the pre-existing program by means of conditional jump instructions concatenated to that edited material. The pre-existing program is uninterrupted by the editing process except for a change of single instructions which do not affect the results of the execution but redirect the execution thread of that control program to be conditionally connected to the edited material. This single writing of single instructions, which do not affect execution results, precludes the possibility of the controller executing partially edited programs. The jump instructions are conditional on a test edit pointer to allow instantaneous implementation of the edits and a simple return to unedited instructions simply by changing the state of the flag.
REFERENCES:
patent: 4745572 (1988-05-01), Wilburn
patent: 4831517 (1989-05-01), Crouse et al.
patent: 5005152 (1991-04-01), Knutsen
patent: 5504902 (1996-04-01), McGrath et al.
patent: 5623665 (1997-04-01), Shimada et al.
Johnston David A.
Rischar Charles M.
Schmidt Otomar
Schultz Ronald E.
Allen Bradley Company, Inc.
Baxter Keith M.
Chaki Kakali
Horn John J.
Miller John M.
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