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data_core:script_tags

Script Tags

Script Tags provide a highly configurable way to define calculation and event raising tags.

Script tags can be written in:

  • C#
  • FLEE (Fast Lightweight Expression Evaluation) - more info

Script Tag Templates

A number of pre-configured script tags exist to perform the following functions:

Calculations

  • Accumulator Calculator
    Calculates the accumulated result of a monitored process tag for a given period (e.g. a day).
  • Aggregation Calculator
    Periodically calculate an aggregation of a process tag.
  • Average Calculator
    Periodically calculates the average value of a process tag.
  • Delta Calculator
    Calculates the delta between the value of two input tags.
  • Delta with Offset Calculator
    Calculates the delta between the value of two input tags, then applies an offset.
  • Energy Based Availability Calculator
    Energy-Based Availability (EBA) is the ratio of actual to expected energy production.
  • Gas Velocity Calculator
    Calculates gas velocity using flow rate and pressure.
  • Normalized Deviation Calculation
    Calculates the normalized deviation of a process value.
  • Ratio Calculator
    Calculates the ratio and between two input tags.
  • Time Based Availability Calculator
    Time-Based Availability (TBA) is an energy expression denoting the ratio of a time-period (e.g. a day) when power is available. It does not discriminate the cause of downtime (e.g. a deliberate stop for maintenance, no/low wind conditions).
  • Time Based Delta Calculator
    Monitors the rate of change of a process tag over a time period.
  • Turbine Status
    A turbine has three basic power-production states: 1. Power; 2. No Wind; 3. No Power.
  • Turbulence Intensity Calculator
    Turbulence Intensity (TI) is a measurement of wind speed turbulence. It is the ratio of wind speed StdDev to Mean.
  • Turbulence Intensity Forecast Calculator
    Turbulence Intensity Forecast (TI) is an measurement of wind speed turbulence derived from forecasted Wind and Gust Speed (rather than observed wind speed variance).
  • Unit Converter
    Convert process value from one unit to another.

Sensor Quality Checks

  • Bad Data Detection
    Data quality check that raises alert if monitored tag returns NaN or has a 'bad' status.
  • Channel Deviation Detection
    Checks for deviation in output from a sensor with two data channels. An alert indicates that one or both of the channels is unreliable. The method is to regularly compare Channel A and Channel B and check if difference is within acceptable instrument error tolerance. Default configuration is to check 24hr average difference 4 times per day.
  • Flatline Detection
    Script tag that checks for flatlining data (i.e. process tags where the tag may be updating regularly, but the sensor value is not changing).
  • Frozen Signal Detection
    Script tag that periodically ensures that newer values are being received for a tag.

Process Data Alerts

  • Equipment Running Status Monitor
    Monitors the running status of a piece of equipment and triggers and resets events when the status changes.
  • Fleeting Excursion Monitor
    Script tag template for monitoring sensors such as acoustic sand probes that can generate fleeting excursions.
  • Hi/Lo Limit Monitor
    Performs a Hi/Lo limit monitor check.
  • Limit Monitor
    Script tag that periodically monitors a process tag value against a limit using MIN/MAX aggregated data.
    Use the FleetingExcursionMonitor template if you require a high degree of accuracy.
  • Limit Monitor 1 Precondition
    Limit monitor that will only trigger or reset an excursion event if a precondition tag value check is met.
  • Limit Monitor 2 Precondition
    Limit monitor that will only trigger or reset an excursion event if two precondition tag value checks are met.
  • Limit Monitor 3 Precondition
    Limit monitor that will only trigger or reset an excursion event if three precondition tag value checks are met.
  • Logic Gate Alert
    An alert that can be used to summarise the status of multiple alerts using an AND or OR operator.
  • Time Based Delta Monitor
    Monitors the rate of change of a process tag over a time period.
  • Value Change Monitor
    Monitors a tag and emits an event every time the value of the tag changes.
data_core/script_tags.txt · Last modified: 2022/03/17 14:27 by su