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Overview

The Eigen Calculation Engine acts as a virtual data historian to allow a user to create calculations based on any other historian data source.

There are two basic types of calculation you can do: Maths functions (CALC) and signal generation (SIGGEN).

There are a couple ways to add a calculation using the calc engine

1.Manually writing it out following the correct syntax of the function (in the tag search)

A calculation is made up of a function and a comma separated List.

• calc/FUNCTION(comma separated list)

Signal Generation are made up of  a Function then followed by a selection variables which create the line.

• calc/Function Amplitude +/- y-Offset @ time-period +/- x-Offset

Both of which are configured using the calculation builder.

Starting A Calculation

• With in the tag Search found across multiple Eigen Macros you have a selection of tools you can use one being the Calculation  Engine.
• Type type " = " to activate a calculation
• eg. calc/FUNCTION(comma separated list)

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2.Option 2 is to use the Calculation Builder

Step 1

• Calculation Engine in the Tag Search

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Calculation Builder

• to activate this you need to follow the steps above and press this icon
• This will bring up the calc editor
  

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Step 2

• this will bring up your first operation
  

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• To change operation
  

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• Will bring a drop down menu to choose from

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• To add More than one operation click

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the arrows next to the drop down menu can be used to move operations into different hierarchy

When you enter a tag you need to have the data source in front of it 

eg. Demo-influxdb/DEMO_01XXV013.DEMAND

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• If you use search feature you can just type the tag and select the one you want ant it will include the data source.

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• When you do a calculation the live data will display to the right of the tag

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• If your calculation is invalid or you use a tag that doesn't exist it will display "NO DATA"

• This is a very indicator that you have used the wrong tag or invalid syntax when doing the operation

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