Process control system and data processing method
AssigneeYokogawa Electric Corporation
InventorsSho Fujita, Kimikazu Takahashi, Nobuaki Ema
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Abstract
A process control system includes: one or a plurality of field devices configured to be placed in a plant; and a control apparatus configured to perform at least one of input and output on the field device to control the plant; and a change trend calculation device configured to calculate a change trend in time-series data including an observed value at each point in time of the field device.
Claims12
A process control system comprising:
- field devices placed in a plant;
- a control apparatus that outputs data to and/or receives data from the field devices to control the plant;
- channels, each of which connects a respective one of the field devices with the control apparatus;
- and
- I/O modules each comprising a processor that:
- calculates a slope of a linear function indicating a change trend per channel in time-series data of observed values, wherein each of the observed values includes an input value indicating a state of the plant, and each of the field devices obtains the observed values at one or more points in time,
- determines, based on the slope, a state value per channel indicating the change trend of a latest observed value among the observed values, and
- outputs the calculated slope and the determined state value to the control apparatus, wherein
- the control apparatus further:
- calculates expected time from a latest point in time to a point in time when any of the observed values exceeds a predetermined threshold by calculating a difference between the predetermined threshold and the latest observed value and dividing the difference by the slope of the latest observed value,
- selects, from among the channels, a channel based on whether the expected time per channel exceeds a time threshold, and
- outputs the state value of the selected channel to an external apparatus.
A data processing method of a process control system comprising field devices placed in a plant, a control apparatus that outputs data to and/or receives data from the field devices to control the plant, channels that each connect a respective one of the field devices with the control apparatus, and I/O modules each comprising a processor, the method comprising:
- outputting and/or receiving data to and/or from the field devices to control the plant;
- calculating a slope of a linear function indicating a change trend per channel in time-series data of observed values, wherein each of the observed values includes an input value indicating a state of the plant, and each of the field devices obtains the observed values at one or more points in time;
- determining, based on the slope, a state value per channel indicating the change trend of a latest observed value among the observed values;
- outputting the calculated slope and the determined state value to the control apparatus;
- calculating expected time from a latest point in time to a point in time when any of the observed values exceeds a predetermined threshold by calculating a difference between the predetermined threshold and the latest observed value and dividing the difference by the slope of the latest observed value;
- selecting, from among the channels, a channel based on whether the expected time per channel exceeds a time threshold;
- and
- outputting the state value of the selected channel to an external apparatus.
Dependencies are inferred from the claim text.