SIMPLORER User Manual V6.0 - FER-a

9
300 Modeling Tools
9.3 Equations
• Initial Values (IVA)
• Equations (EQU)
• DES (DES)
Initial Values
>>Basics>Tools>Equations
Variables defined in an Initial Value Assignment is computed once at the simulation start.
They can be used in each component on the sheet.
Dialog Settings
«Expression»
Create, delete, or move entries with the symbols placed on the upper right side. Choose
«Equation» to enter the expression in the single line mode. Choose «If…Else…» to open the
equation editor window.
In the single line mode, click in the «Expression» field and define the expression, for example
C:=A+B, var1:=sin(2*PI*50*t). See also “Defining Parameters” on page 49. and “Equations,
Expressions, and Variables” on page 32.
«Expression»
To open the equation editor window, double-click the symbol in the text box or choose «If…
else…» on the drop-down menu.
The editor window can display the complete text of an equation. In addition, you can insert
standard mathematical functions and If-Else statements from a panel.
To insert functions, click the f(x) symbol and insert a function by clicking one of the symbols
on the panel.
To define an If-Else statement click the new entry symbol and select one of the statements.
Define conditions and variable assignments in the text to complete the inserted template.
To check the syntax of an expression, click the � symbol. Errors and warnings are displayed
below the edit box.
Click to close the equation editor window and return to the single line mode. If errors
in the definition occur, the ⊗ symbol is displayed at the beginning of an entry in the list.
See also “Equations, Expressions, and Variables” on page 32.
«Info»
Field for user specific information about an expression. Click in the field of the corresponding
entry and enter the text. You can display these information on the sheet by defining the display
setting within the «Output/Displays» tab.
� � «Output»
If the box is checked, the variable is saved in the result file (.sdb) during the simulation.
Please note: If you want to display a variable value, you have to select the box in the output
dialog or in a Display Element. If the box is deactivated, you cannot display the variable value
after the simulation. See also “Defining Displays and Outputs” on page 51.