System and method for associating a DLPDU received by an interface chip with a data measurement made by an external circuit
First Claim
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1. A method for diagnosing a segment of a process control network comprising:
- receiving a DLPDU on the process control network;
taking a measurement of the DLPDU network to extract measurement data;
testing a status indicator to determine if the DLPDU is currently active; and
associating the measurement data with the DLPDU if the status indicator is true.
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Abstract
A diagnostic tool has a packet based network medium attachment unit, a measurement interface, a network interface, and a microprocessor for reading DLPDUs from a network segment and for taking simultaneous measurements of DLPDUs on the segment. The measurement data is associated with a stored DLPDU if the DLPDU is still active on the network segment when the measurement data is read by the microprocessor. The diagnostic tool utilizes a currently active attribute to determine the status of a DLPDU.
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Citations
14 Claims
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1. A method for diagnosing a segment of a process control network comprising:
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receiving a DLPDU on the process control network; taking a measurement of the DLPDU network to extract measurement data; testing a status indicator to determine if the DLPDU is currently active; and associating the measurement data with the DLPDU if the status indicator is true. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for associating measurement data with a DLPDU on a process control network comprising:
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measuring a received DLPDU object on a network segment to derive measurement data; and associating the received DLPDU object with the measurement data if a currently active attribute is true after the measurement data is taken. - View Dependent Claims (8, 9, 10)
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11. A method of associating measurement data with a received process signal on a process control loop, the method comprising:
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receiving a process signal from the process control loop with a diagnostic tool connected to the process control loop; measuring the received process signal to derive measurement data; writing data representing the process signal to a memory queue along with a currently active attribute; processing with the diagnostic tool the data at a front of the memory queue such that the data stored first in the memory queue is processed first; and associating the measurement data with the data from the memory queue received if the currently active attribute associated with the data from the queue is true at the time of processing. - View Dependent Claims (12, 13, 14)
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Specification