The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1991
Filed:
Apr. 05, 1989
Applicant:
Inventor:
Neil W Knutsen, Milwaukee, WI (US);
Assignee:
Allen-Bradley Company, Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
364900 ; 364973 ; 3649269 ; 364949 ; 364977 ; 364147 ;
Abstract
A decompiler for industrial controllers operates on ladder logic programs that have been compiled into series jump format machine code. Series jump machine code evaluates ladder logic rungs through jump instructions jumping to a COIL ON routine, a COIL OFF routine, or another jump instruction, where each contact of the rung is associated with a single jump instruction. The decompiler creates a matrix of connection nodes then simplifies the matrix to return the ladder logic program. A decompiled ladder diagram may be thereby produced without the need for non-executable source code 'tokens' included within the compiled machine language program.