Self-diagnostic process control loop for a process plant
First Claim
1. A method of diagnosing an adaptive process control loop comprising:
- measuring process control loop signal data generated as a result of a normal operation of one or more process control devices within the adaptive process control loop when the adaptive process control loop is connected on-line within a process control environment;
asynchronously diagnosing on a computer a plurality of components of the adaptive process control loop from the process control loop signal data;
generating on the computer a plurality of diagnostic indices pertaining to process control loop parameters for a plurality of components of the adaptive process control loop from diagnostic results of the component generated from the process control loop signal data, wherein generating a plurality of diagnostic indices comprises generating an index for one or more of the group consisting of;
a resolution of a process control loop device within the adaptive process control loop, a dead band of a process control loop device within the adaptive process control loop and a hysteresis of a process control loop device within the adaptive process control loop; and
evaluating on the computer a condition of the adaptive process control loop from one or more of the plurality of diagnostic indices.
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Accused Products
Abstract
A method of diagnosing an adaptive process control loop includes measuring process control loop signal data, generating a plurality of process control loop parameters from the process loop signal data and evaluating a condition of the adaptive process control loop from one or more of the plurality of process control loop parameters. The process control loop data is generated as a result of a normal operation of one or more process control devices within the adaptive process control loop when the adaptive process control loop is connected on-line within a process control environment. A self-diagnostic process control loop includes a diagnostic tool adapted to receive a diagnostic index pertaining to a process control loop parameter for each component of the process control loop and for the complete process control loop. Each diagnostic index is generated from signal data by a corresponding index computation tool. The diagnostic tool is further adapted to evaluate a condition of the process control loop from one or more of the diagnostic indices.
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Citations
48 Claims
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1. A method of diagnosing an adaptive process control loop comprising:
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measuring process control loop signal data generated as a result of a normal operation of one or more process control devices within the adaptive process control loop when the adaptive process control loop is connected on-line within a process control environment; asynchronously diagnosing on a computer a plurality of components of the adaptive process control loop from the process control loop signal data; generating on the computer a plurality of diagnostic indices pertaining to process control loop parameters for a plurality of components of the adaptive process control loop from diagnostic results of the component generated from the process control loop signal data, wherein generating a plurality of diagnostic indices comprises generating an index for one or more of the group consisting of;
a resolution of a process control loop device within the adaptive process control loop, a dead band of a process control loop device within the adaptive process control loop and a hysteresis of a process control loop device within the adaptive process control loop; andevaluating on the computer a condition of the adaptive process control loop from one or more of the plurality of diagnostic indices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A self-diagnostic process control loop within a process control environment comprising:
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a plurality of process control loop devices; a memory adapted to store signal data from the process control loop, wherein the signal data is generated as a result of a normal operation of the plurality of process control devices within the process control loop when the process control loop is connected on-line within a process control environment; and a diagnostic tool adapted to receive one or more diagnostic indices pertaining to a process control loop parameter for a plurality of components of the process control loop, including a diagnostic index pertaining to a diagnostic of a process control device within the process control loop, and for the complete process control loop, wherein each diagnostic index is generated from the signal data by a corresponding index computation tool and wherein the diagnostic index pertaining to a diagnostic of a process control device within the process control loop comprises one or more of the group consisting of;
a resolution of a process control loop device within the process control loop indicating a minimum process control signal required to cause a response in the process control loop device, a dead band of a process control loop device within the process control loop indicating a measure of a range an input can vary without an observable response in the process control loop device in response to a process control signal and a hysteresis of a process control loop device within the process control loop indicating a displacement of a process control loop device based on an input to the process control loop device and an output of the process control loop device, the diagnostic tool further adapted to evaluate a condition of the process control loop from one or more of the diagnostic indices. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification