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. 22, 2008
Filed:
Oct. 05, 2006
Garrie D. Huisenga, Chaska, MN (US);
Randy J. Longsdorf, Chaska, MN (US);
Donald R. Lattimer, Chaska, MN (US);
Garrie D. Huisenga, Chaska, MN (US);
Randy J. Longsdorf, Chaska, MN (US);
Donald R. Lattimer, Chaska, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A diagnostic device for coupling to a process control loop includes digital communication circuitry configured to receive a digital communication signal from the process control loop. The digital communication signal is a digitally modulated analog signal on the process control loop which is modulated to a plurality of discrete analog signal levels representative of digital values. Diagnostic circuitry diagnoses operation of the process control loop which may include field devices of the process control loop based upon the digitally modulated analog signal.