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:
Jun. 09, 1998
Filed:
Sep. 29, 1995
Timothy J Murphy, Hudson, OH (US);
Alan C Cribbs, North Canton, OH (US);
Robert C Weppler, Mayfield Heights, OH (US);
Margarita M Hutz, Auburn, OH (US);
Kendal R Harris, Mentor, OH (US);
Jack D Calderon, Concord, Township, Lake County, OH (US);
David A Karpuszka, Concord, Township, Lake County, OH (US);
Allen Bradley Company, Inc., Milwaukee, WI (US);
Abstract
A bus structure for interconnecting the modules of an industrial automation controller includes DATA lines and associated control lines that enable interface circuits on each module to transfer frames of data. Modules connected to the bus structure support data transfers of differing widths and differing speeds, and interface circuits within each module automatically adapt to data width and speed differences between communicating modules. During a first bus cycle of each transfer, sending and receiving modules negotiate a bus width and clock speed to be used for the transfer by asserting their respective width and speed codes onto a set of wired-or status lines. After the first bus cycle, the status lines are then used for communicating alternate functions between the participating modules.