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. 01, 1987
Filed:
Nov. 16, 1984
Odo J Struger, Chagrin Falls, OH (US);
Allen-Bradley Company, Inc., Milwaukee, WI (US);
Abstract
In a programmable controller, addresses for a group of input/output modules are decoded to generate an enable signal to each respective module. To increase the density of I/O circuits per module without increasing the width of the data bus, the I/O modules are provided with enabling circuits that are responsive to a pair of associated enabling signals in one method of I/O scanning and responsive to an enabling signal and two or more byte addresses received in another method of I/O scanning. Circuit paths have been added on a backplane circuit board to allow each enable signal to be coupled to a pair of I/O modules in the first method of I/O scanning. In the second method of I/O scanning, the hardware for carrying out the first method is disabled and byte addresses are used to couple multiple bytes of I/O status to each I/O module.