6,522,978 B1* 2/2003 Chen et al..................... 7O2/35 2007/0088.448 A1 4/2007
Mylaraswamy et al. 6,564,119 B1* 5/2003 Vaculik et al............... TOOf 146 2007/0O88528 A1 …

5,539,877 5,817,958 5,859,964 5,949,677 5,949,678 5,950,147 6,115,656 6,133,132
6,207,043 6,368,975 6,466,877 6,485,631 6,505,145 6,521,080 6,522,978 6,564,119 …

5,023,045 A 6, 1991 Watanabe et al. 2002/0077792 A1* 6/2002 Qiu............................... 703/2
5,333,240 A 7, 1994 Matsumoto et al. 2003/0225466 A1 12/2003 Yulevitch et al. 5,351,247 …

(57) ABSTRACT A method and device or monitoring parameters in a process reduces power
consumption and bandwidth requirements in the transmission of the monitored parameter to …

(US)(Continued)(*) Notice: Subject to any disclaimer, the term of this OTHER
PUBLICATIONS patent is extended or adjusted under 35 USC 154 (b) by 159 days. Bell, M …

The present invention is a method for detecting an abnormal event for process units of an
ethylene processing system. The method compares the operation of the process units to a …

A device for diagnosing operation of an industrial process control or monitoring system
includes an input configured to receive an input related to a process signal. A first statistical …

(57) ABSTRACT A computer-implemented integrated expert system for the identification of
abnormal events in an industrial plant. The expert System integrates a model-based expert …

BACKGROUND DISCUSSION In process automation technology, field devices are often
employed, which serve to register and/or influence process variables. Serving for registering …

Detection of one or more abnormal situations is performed using various statistical
measures, such as a mean, a median, a standard deviation, etc. of one or more process …