On line monitor for a control device
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United States of America Patent
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Aug 26, 2003
Grant Date -
N/A
app pub date -
Nov 24, 1999
filing date -
Nov 24, 1999
priority date (Note) -
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Abstract
An online monitor that can be permanently attached to a device to be monitored continuously monitors a set of analog signals and initiates data capture over a window of time when a user programmable set of conditions is satisfied. The online monitor includes a digital signal processing unit, a modular, interchangeable, analog signal conditioning base unit that can be tailored to the specific requirements of the process to be monitored and a modular, interchangeable, communication interface unit. The interface unit permits the digital signal processing unit to exchange data with external equipment such as network computers via a number of industry standard communication fieldbus protocols. The online monitor provides the capability to define the trigger condition under which data capture is initiated by comparing a user defined signal to a function of the instantaneous value of another signal or constant. Data captured is stored indefinitely in internally battery backed memory and the instant at which data capture is initiated is determined accurately via a time tagging function, so the data can be retrieved at a later time.
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