Expression (click for more info) Insert Operation (click for more info) Child Point Tags (click for more info)

Configuring Aggregation From Children

If a meter group is not directly forecasting its own forecast value, it can be assigned a value based on an aggregation of the forecasts of its children. This may be useful in displaying a forecast value for a logical grouping that does not have any meaningful associated input data, and thus no calculated forecast. An aggregation that is representative of child meter or groups may be useful for reporting purposes. Group aggregation configuration takes the form of an arithmetic expression.

Aggregation can be used to create a multi-directional meter representation. For example, a group can be created with a receipt and delivery meter as children, and an aggregation can be setup for the group that subtracts the receipt meter’s forecast from the delivery meter’s forecast.

Note: The meter group must not have an associated neural network definition active in the system.

To Configure Aggregation from Children

  1. Click the Meters/Owners page of the ELF Editor.
  2. Add a New Child or New Sibling, or double-click to Edit a configured meter.
  3. Configure the properties in the General page.
  4. Click the Assignments page.
  5. Click Aggregation from Children from the Value Assignment Type drop-down menu.
  6. Click Aggregation to view the Edit Aggregation Rule dialog box.
  7. Configure the rule using the properties described below.

Edit Aggregation Rule

Edit Aggregation Rule

The properties on the Edit Aggregation Rule dialog box are described below.

Parameter Description

Expression

The arithmetic expression to be used to aggregate the forecast for this meter group. The expression may consist of constant value terms, operations, functions, and/or meter or group facility tags. In the case of a facility tag, the net forecast value for the meter or group will be substituted. Any meter or group facility tags contained in the expression must be child facilities of the target group.

Insert Operation

Click to insert the desired operation into the expression: parentheses, exponentiation, division, multiplication, subtraction, and addition.

Function

Select one of the following functions:

Function Description
ABS Returns the absolute value of a specified number.
COS Returns the value containing the cosine of the specified angle.
EXP Returns the value containing e (the base of natural logarithms) raised to the specified power.
LOG Returns the value containing the natural logarithm of a specified number.
SIN Returns the value specifying the sine of an angle.
SQR Returns the value specifying the square root of a number.
TAN Returns the value containing the tangent of an angle.

Insert Function

Click to insert the selected function into the expression.

Child Point Tags

Select the point tag for the child facility of the target group.

Note: CygNet tags as operands in the expression must be enclosed in double quotes (for example, "ELFTEST.UIS::METER-1.VOLLF"+"ELFTEST.UIS::METER-2.VOLLF"/2).

Insert Point Tag

Click to insert the selected point tag into the expression.

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