Online Calculations

Overview

Online Calculations are a type of Calculated Point in Bazefield that continuously compute values in real time. Powered by the Bazefield Calculation Service, these calculations are triggered every time their input value updates, making them ideal for live monitoring and dynamic KPIs.

Key Characteristics

• Real-Time Execution: The calculation runs immediately whenever any input point changes.

• Always Up-to-Date: Outputs reflect the most current state of the system.

• Recalculable: Logic can be updated and recalculated at any time, over any time period.

• Long-Term Storage: Results are saved to the DataEngine Historian, alongside other real-time telemetry.

Example Use Cases

ℹ️ Real-Time Assets Available

A point named AssetsAvailable is configured for a Solar Farm model as follows:

• Point Type: CALCULATED_POINT

• Script Type: Online_Calculation

• Expression: Sum($[{{@}}-INV%-Available]:[0])

• Data Template: HISTORIAN (online data should be stored in the DataEngine archive files)

This configuration uses substitution parameter {{@}} to retrieve the Solar Farm’s ObjectKey and wildcard % to retrieve all assets keyed “INV”. The resulting match is all “Available” points for inverters belonging to the site (e.g., SF1-INV001-Available, SF1-INV002-Available, etc.).

The Inverter “Available” point is 0/1 based on if the inverter is in an available state or not. Therefore, this Online Calculation gives the total number of available inverters for the solar farm in real time.

ℹ️ Total Check Meter Power

A point named ActivePowerMeter is configured for a Solar Farm model as follows:

• Point Type: CALCULATED_POINT

• Script Type: Online_Calculation

• Expression: Sum($[{{@}}-{{getObjectAttribute(meterAssetPattern)}}-ActivePower]:[0])

• Data Template: HISTORIAN (online data should be stored in the DataEngine archive files)

Like the example above, this configuration uses substitution parameter {{@}} to retrieve the Solar Farm’s ObjectKey, but it also incorporates substitution parameter that retrieves a user-defined site attribute called “meterAssetPattern". The resulting match is all “ActivePower” points for meters that match the “meterAssetPattern” attribute (e.g., for attribute MTROCM?, SF1-MTROCM1-ActivePower, SF1-MTROCM2-ActivePower, etc. would be matched).

Therefore, this Online Calculation gives the total check meter ActivePower, computing gross output for the solar farm in real time.

ℹ️ Live Breaker Open Detection

A point named FeederBreakersStatus is configured for a Wind Farm model as follows:

• Point Type: CALCULATED_POINT

• Script Type: Online_Calculation

• Expression: SUM(TagLast(ExpandPointKeys(GetChildObjectKeys(310), "BreakerStatus"))) > 0

• Data Template: HISTORIAN (online data should be stored in the DataEngine archive files)

This online calculation will do the following, in order from inner methods to outer methods:

1. GetChildObjectKeys(310): Retrieve all ObjectKeys matching type 310 (Feeder Breaker)

2. ExpandPointKeys(GetChildObjectKeys(310), “BreakerStatus”): Retrieve an array of child feeder breaker Tag names that match the Point name “BreakerStatus”

3. TagLast(ExpandPointKeys(GetChildObjectKeys(310), "BreakerStatus")): Retrieve the latest tag values for the array of tags from the last step

4. SUM(TagLast(ExpandPointKeys(GetChildObjectKeys(310), "BreakerStatus"))): Sum the tag values retrieved in the last step

5. SUM(TagLast(ExpandPointKeys(GetChildObjectKeys(310), "BreakerStatus"))) > 0: Check if the sum of BreakerStatus tags is greater than zero. If so, output True, else output False.

Since the BreakerStatus tag is a 0/1 denoting whether a given Feeder Breaker is closed/open, this online calculation provides a real-time indicator if any of the site feeder breakers are open.

Key Benefits

✔️ Immediate Feedback: Perfect for dashboards, alarms, and operational decisions.

✔️ High Responsiveness: Reacts instantly to changing conditions.

✔️ Integrated Storage: Seamlessly historized with other real-time data.

✔️ Flexible Logic: Supports arithmetic, conditionals, and multi-point references.

When to Use Online Calculations

Use Online Calculations when:

• You need real-time visibility into asset behavior.

• The output must update immediately with input changes.

• You are powering live dashboards or alerts.