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:
Feb. 26, 1991
Filed:
Feb. 16, 1989
Applicant:
Inventors:
Gary L Chadwick, Boise, ID (US);
Joe F Johnson, Boise, ID (US);
Assignee:
Micron Technology, Inc., Boise, ID (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
364550 ; 340679 ; 34087028 ; 364146 ;
Abstract
A signal timing analyzer monitors a programmable logic control (PLC) of an industrial machine. Signal states of the PLC are sampled and the signal information is then transferred to a receiver card which is connected to a computer data bus. This allows the computer to monitor a piece of equipment by 'eavesdropping' on the industrial controller that is actually operating and monitoring the equipment. The analyzer uses an on-board clock and timing circuit, so that the computer is not limited by the computer's clock speed in controlling sampling rates.