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:
Jan. 14, 2003
Filed:
May. 19, 1999
Applicant:
Inventor:
James Calvin, Mansfield, MA (US);
Assignee:
The Foxboro Company, Foxboro, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B 2/100 ;
U.S. Cl.
CPC ...
G08B 2/100 ;
Abstract
A self-validating output module in a control system includes a current detector and an operating component having at least two states. When the operating component is in the first state, current is directed away from a current detector and toward a load. When it is in its second state, current is directed toward the current detector and away from the load. The presence or absence of current on the current detector is thus a status signal indicative of whether or not current is being supplied to the load. This status signal is then made available to a controller.