C Control The I Unit-M Advanced 5 Vdc Inputs / outputs 16 x digital I/Os / 8 x analogue or digital I/Os Program memory 2 198805 データシート

SELECT CASE statements can be nested. Each nested SELECT CASE statement must have a matching  
END SELECT statement.  
 
 
Select Case matchexpression 

    End Select  
 
 
 
 
 
 
WAIT 
The Wait instructionis used as level-sensitive control. 
The processor waits when the expressions is False. When the expression is True, the statement is executed. 
The expression (or it's result) is treated as boolean value, therefore wait responds to True and False only 
 

Syntax: WAIT [expression]                          
 

Because a bitport is always boolean 

it may be written: 
 
 
 
GOTO 
The GOTO Instruction causes a jump to a label in source code. No return address is saved 
 

Syntax: GOTO Label 
 
 
The example is equal in functionas:  WAIT MyBitPort. 
 
 
 
FUNCTION 
The Function keyword initialises a new function. A function may request parameter when it is called. To save 
memory you may use the REF keyword to create a reference for variables i.e. the parameters passed to the 
functions occupies the same bytes of memory as the reference. Using this reference variables you may save 
a lot of memory because always only the set of reference variables is used for passing the parameters to a 
function. You may also return a value when the function is exited.  
 
 
Syntax: Function [Name] ([[Parameter] As [Data type] | [Parameter] Ref [Variable], ...]) 
              [instructions] 
             Return [expression] 

             End Function   
 
 
 
 
 
 
 
 
Name:         Valid identifier  
Parameter:  Optional. Valid variable identifier  
Data type:   Required if parameter variable is not a REF Type variable .  
Variable:     Required if parameter variable is a REF Type variable Identifier of a declared variable.