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:
Sep. 18, 2007
Filed:
Nov. 30, 2004
William John Dax, Orefield, PA (US);
Jeffery Van Bauer, Macungie, PA (US);
William John Dax, Orefield, PA (US);
Jeffery Van Bauer, Macungie, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
The work memory of a programmable logic controller (PLC) is loaded with only one instruction at a time from the PLC's load memory which contains the entire instruction set to control a process. Each instruction has a format which contains at least one option code which must be evaluated to be true by the PLC interpreter before the corresponding instruction can be executed. If the interpreter evaluates the at least one option code to be false, the instruction is not executed and the next instruction is transferred from the load memory to the work memory and its corresponding option codes are then evaluated.