SIMPLORER User Manual V6.0 - FER-a

Equations
SIMPLORER 6.0 — Manual 301
>>Basics>Tools>Equations
The equation function provides mathematical expressions to all SIMPLORER modules. The
formula interpreter manages general mathematical and logical expressions, which consist of
a number of operands and operators. In addition, widely used mathematical standard functions
are supported. Variables are allowed as operands (for example voltages or currents from
the circuit components, quantities from the Block Diagram and variables and states from the
State Graph). Of course, variables from other expressions can also be used in an expression.
The name of a variable is defined by the user. It can be up to 50 characters long and must start
with a letter.
The spelling of the variable names is case sensitive.
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.
� «Calculation Sequence»
In the list, select «Standard», «Before State Graph», or «After State Graph». Standard
means the equation is calculated first of all simulation quantities (before circuit, block diagram,
state graph, time functions, …). Before State Graph is computed before the state graph
is processed; After State Graph, after the state graph is processed. See also 13.6 “Simulator
Backplane” on page 418.
«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.