Open wire detection system and method
First Claim
1. An open-wire detection system, comprising:
- a current transmitter connected to at least one wire, wherein said current transmitter provides a minimum current;
an anti-aliasing filter connected an analog-to-digital converter, wherein said anti-aliasing filter receives said minimum current provided by said current transmitter and provides an output signal to said analog-to-digital converter; and
a noise filter connected to an open-wire threshold detector, wherein said noise filter and said open-wire threshold detector permit detection of input levels below said minimum current provided by said current transmitter, wherein an output from said open-wire threshold detector is sampled multiple times at intervals that correlate with a frequency of a plurality of digital signals to produced sampled data, such that if said sampled data is below said minimum current, said at least one wire is reported as constituting an open-wire.
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Accused Products
Abstract
An open-wire detection system and method includes a current transmitter that can be connected to one or more wires, wherein the current transmitter provides a minimum current and/or a current that is greater than the minimum current. An anti-aliasing filter is connected to an analog-to-digital converter, such that the anti-aliasing filter receives the minimum current provided by the current transmitter and provides an output signal to the analog-to-digital converter. A noise filter is generally connected to an open-wire threshold detector, wherein the noise filter and the open-wire threshold detector permit detection of input levels below the minimum current provided by the current transmitter. An output from the open-wire threshold detector can be sampled multiple times at intervals that correlate with a frequency of a plurality of digital signals to produce sampled data, such that if the sampled data is below the minimum current, one or more of the wires (e.g., a return field wire and/or a field wire connected to a power supply) is reported as constituting an open-wire.
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Citations
20 Claims
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1. An open-wire detection system, comprising:
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a current transmitter connected to at least one wire, wherein said current transmitter provides a minimum current; an anti-aliasing filter connected an analog-to-digital converter, wherein said anti-aliasing filter receives said minimum current provided by said current transmitter and provides an output signal to said analog-to-digital converter; and a noise filter connected to an open-wire threshold detector, wherein said noise filter and said open-wire threshold detector permit detection of input levels below said minimum current provided by said current transmitter, wherein an output from said open-wire threshold detector is sampled multiple times at intervals that correlate with a frequency of a plurality of digital signals to produced sampled data, such that if said sampled data is below said minimum current, said at least one wire is reported as constituting an open-wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An open-wire detection system, comprising:
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a 4-20 mA current transmitter connected to at least one wire, wherein said 4-20 mA current transmitter provides a minimum current; an anti-aliasing filter connected an analog-to-digital converter, wherein said anti-aliasing filter receives said minimum current provided by said 4-20 mA current transmitter and provides an output signal to said analog-to-digital converter; a noise filter connected to an open-wire threshold detector, wherein said noise filter and said open-wire threshold detector permit detection of input levels below said minimum current provided by said 4-20 mA current transmitter, wherein an output from said open-wire threshold detector is sampled multiple times at intervals that correlate with a frequency of a plurality of digital signals to produced sampled data, such that if said sampled data is below said minimum current, said at least one wire is reported as constituting an open-wire; and a control system that receives at least one signal from said analog-to-digital converter and at least one signal from said open-wire threshold detector. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An open-wire detection method, comprising:
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connecting a current transmitter to at least one wire, wherein said current transmitter provides a minimum current; connecting an anti-aliasing filter an analog-to-digital converter, wherein said anti-aliasing filter receives said minimum current provided by said current transmitter and provides an output signal to said analog-to-digital converter; and connecting a noise filter to an open-wire threshold detector, wherein said noise filter and said open-wire threshold detector permit detection of input levels below said minimum current provided by said current transmitter, wherein an output from said open-wire threshold detector is sampled multiple times at intervals that correlate with a frequency of a plurality of digital signals to produced sampled data, such that if said sampled data is below said minimum current, said at least one wire is reported as constituting an open-wire. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification