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Title:
TEMPERATURE DETECTION SYSTEM IN PLANT CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP2010103760
Kind Code:
A
Abstract:

To exactly attenuate or eliminate a noise signal without being affected by plant difference, cable route difference, or the like.

A plant control system includes an active noise cancellation processing unit 5 for combining a digital temperature signal 501 obtained by performing A/D conversion of an analog temperature signal being an output of a temperature detector 1 installed at a process field P of a plant with an antiphase digital noise signal 503 being an antiphase of a digital noise signal included in the digital temperature signal and canceling the digital noise signal included in the digital temperature signal, and outputs a digital temperature signal 504 from which a noise signal is attenuated or eliminated by the active noise cancellation processing unit 5.


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Inventors:
NISHIJIMA HIROKI
Application Number:
JP2008273245A
Publication Date:
May 06, 2010
Filing Date:
October 23, 2008
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H04B15/02; G01D3/028; G01K7/00
Domestic Patent References:
JP2005086779A2005-03-31
JP2008035356A2008-02-14
JPH1013348A1998-01-16
JP2001102923A2001-04-13
JP2004219098A2004-08-05
JPS61248678A1986-11-05
JPS63173916A1988-07-18
JPH08136606A1996-05-31
JP2005086779A2005-03-31
JP2008035356A2008-02-14
JPH1013348A1998-01-16
JP2001102923A2001-04-13
Attorney, Agent or Firm:
Masuo Oiwa
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami



 
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