only with constant values. Example

!'} {attribute 'Test':='TestValue1; TestValue2; TestValue

the value of the var

Compiler Error C0198 Message : String constant '<string value

Compiler Error C0131 Message : '<value>' is not allowed as operand

the variable values, as well

>(<FB input variable>:=<value

values are also

its current value. :

and saves the values