eDrive has the capability of creating point objects that are combinations of other point objects.  These are called "Calculated Points" and eDrive lets you create the mathematical formulas that determine their values.

To create calculated Point Objects in eDrive you must first define a virtual Device of the type 'Calculated'.  Then create the calculated Point Objects under that Device.

To better organize calculated Point Objects, you may create as many Devices of this type as needed.  eDrive will treat them all the same as with other device types.

Creating Calculated Points Pollers

Calculated Point Device Configuration Parameters:

Device Name	Enter a descriptive name that eDrive will use to reference this device.  Spaces and punctuation characters are allowed.
Device Type	From the drop down list, select the option: Calculated.
Target Interval (seconds)	This value represents the repetitive interval at which eDrive will perform the assigned calculation and update the present value of each of its Point Objects.

Calculated Point Object Configuration Parameters:

Name	Enter a descriptive name that eDrive will use to reference this Point Object.  Spaces and punctuation characters are allowed. If '/' (forward slash) characters are included in the name, eDrive will create the Point Object in a hierarchical, tree structure with the '/' characters as delimiters.  The tree structure will appear in the list of eDrive objects along the right hand side of the page.
Formula	Enter arithmetic expression that defines the calculation that will be performed to arrive at the latest value of the Point Object. References to any other eDrive Point Object values can be included in the Formula by entering the unique path/name. An extended list of operators and variables can be found here

Note!  You can assign Additional Properties to any Point Object such as Offset, scaling Multiplier, History, etc.  Please refer to the Additional Point Properties section for more detail.

When Device and/or Point Object configuration is complete, select the Submit Config function to save your changes to eDrive.