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. 15, 2003
Filed:
Dec. 27, 2001
Applicant:
Inventors:
Arthur Paul Pietrzyk, Thompson, OH (US);
Thomas Sugimoto, Twinsburg, OH (US);
Assignee:
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 1/9173 ;
U.S. Cl.
CPC ...
H03K 1/9173 ;
Abstract
A safety system programmable logic controller provides for cross connection of inputs and outputs of separate independent control modules through the use of virtual wire connections passing as messages on a single logical backplane. The backplane executes a high level protocol that provides wire-like indications of communication failures mimicking those of separate physical wires.