The sole purpose of
a definition is assign a value to a word and therefore make a script easier for a human to read. They do not
use utilize any bytecode space in a script as they are not sent to the CronusMAX PLUS. When a script
is compiled the words are changed to their assigned value.
Syntax
define <name> = <value>;
<name>
:
The name of the constant.
<value>
:
The value assigned to the constant. Note only Integer values can be used.
Once a word is
defined and given a value, that word can be used anywhere in the script where a value is valid, as shown
below;
define my_value = 50;
int myvar;
main {
set_val(XB1_RT, my_value); //Set RT / R2 to 50
myvar = my_value; //myvar equals 50
if(myvar >= my_value) { //If myvar is greater than or equal to 50
//Do Something
}
if(get_val(XB1_LT) > my_value) { //If LT / L2 is greater than 50
//Do Something
}
}
A define is a static value and therefore cannot be changed
during run time, as shown below;
define my_value = 50;
main {
my_value = 70; //This will produce a compiler error
}
If you wished to
assign a value to a word and change its value during runtime, you would use a variable instead of a define.
