Configuration variables: Basics

Configuration variables are used to configure amongst other things parameters and their input fields for the Project Builder. These input fields, their function and the appearance can be defined in more detail under Properties of the respective configuration variable. Use configuration variables if you want to give the engineer the possibility to change specific values and access macro variables. You can define these properties:

1. Displayed name: Enter the displayed name of the configuration variable. This name is then displayed in the Project Builder.
2. Type: Select a variable type. You can select between the following types:

   Variable type	Meaning	Example
   Integer	Integer values	1, 2, 3
   Double	Floating-point number	3.456
   String	String	EPLAN
   Boolean	Two possible states	true or false

3. Mandatory: Activate the check box if you want the entry of a value for the variable to be mandatory in the Project Builder. Such input fields are identified by an *.
4. Visibility: Design the input field dynamically. It will only be visible in the Project Builder under certain conditions. Additional information is available here.
5. Selection values: Specify values if you want the engineer to have to select one of the values from a drop-down list in the Project Builder. The free entry of a value is then no longer possible.

Apart from the configuration of the user interface you can also define internal rules for configuration variables that are not directly visible in the Project Builder.

Work with formulas

The input field or the Editor button is located at all points at which you can work with formulas. In addition to the classic formula input, additional editing options are available in the editor.

In addition to the formula input, you can also enter comments into the formula editor in order to document formula contents or store an editing history, for example. You can either store one-line or multi-line comments in the editor. It is also possible to formulate multiple comments for a formula.

Each formula must start with an "equals" sign, e.g. =F206. You can use the following operators in the formula:

Operator	Meaning	Valid for	Example
+, -, *, /	Arithmetic calculation	Integer, double	=V1*V2
'...'	Literal	String	='EPLAN'
+	Linking of strings	String	='EPLAN'+'efficient engineering'
==, !=, <, <=, >, >=	Comparison operators	Integer, double	=V1<=V2
not , and, or, xor	Logic operators	Boolean	=(V1<=V2) and (V1>=V3)
&&, ||	Alternative notation for the logical operators and and or	Boolean	=(V1<=V2) && (V1>=V3)
if Condition then Value1 else Value2 endif or Condition ? Value1 : Value2	Conditional values	All	=if V1==0 then V2 else V3 endif or =V1==0?V2:V3
//	Begin with a one-line comment with these operators.	All	// Comment
/* */	Begin and end with a multi-line comment with these operators.	All	/* Comment */

1. Editor