Type of expression

A calculated indicator can be based on: • VB script - The expression is developed in the Calculation tab by adding inputs and functions to create a formula that is calculated at runtime for the indicator reading • Stored procedure - The expression is provided in a stored procedure that receives its inputs at runtime and returns a value for the indicator reading • C# - The expression is provided in a C# script by either a simple expression or complete class that receives its inputs at runtime and returns a value for the indicator reading • VB.NET - The expression is provided in a VB.NET script by either a simple expression or complete class that receives its inputs at runtime and returns a value for the indicator reading.

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Expression type

The scope of the C# or VB.NET script. Your choices are Simple script or Complete class. If you select Complete class, APM provides a starter script for you.

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Stored procedure name

The name of the stored procedure in your APM database.

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List of Constants

The system automatically lists the constants that apply to the calculation inputs that you have created for the indicator. For example, if you are creating a function that uses an enumerated attribute as part of the calculation, this section shows the list of values for the attribute in the form that they will be used in the function. You cannot directly change the text entered here.

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Stored procedure call syntax

APM automatically creates the syntax based on the name of the stored procedure and the inputs. The call statement has the following syntax: exec indReadingValue output storedprocedurename input1, input2, inputX, indReadingValue output where storedprocedurename is the name of the procedure, followed by the names of the calculation inputs.

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Calculation

The calculation performed for a numeric indicator. APM generates the indicator readings based on the calculation entered here. The expression can contain up to 32,000 characters. To work on the calculation expression in a separate window, click the Full Window button. To see the operators that you can use in the calculation, and examples of how to use them, click the View Functions button.

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