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

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

• 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.

• 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.

• 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.