System and method for the safe automatic detection of a field device communicating with current modulated signal
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United States of America Patent
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Aug 14, 2007
Grant Date -
Jun 9, 2005
app pub date -
Nov 30, 2004
filing date -
Dec 4, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A current generator that provides a first current level to read a configuration parameter of a field device. The current generator also provides a second current level. The first current level is lower in amperage than the second current level. The first current level does not operate the field device. The second current level operates the field device. A current sensor is connected in circuit with the field device. The current sensor reads the configuration parameter associated with the first current level. A method is provided that creates a current that reads a configuration parameter. The current has less than a minimum amplitude to operate necessary to operate a field device. The configuration parameter is read from the field device through employment of the current. The field device is configured through employment of the configuration parameter.
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