Sensaphone SCADA 3000 Users manual - Manual (Page 190)

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SCADA 3000 User’s Manual
There are C commands other than “if” and “else”, and built-in variables, to access SCADA
3000’s inputs and outputs. Details for these will be covered later.
KeYWORDS
The following is a list of all valid components of the C language within the SCADA 3000.
char
int
float
if
else
for
do
while
Definitions
CHAR - Used to define a variable as a character. A character can hold a value from -128 to
+127 and must be a whole number. Exceeding this range will cause incorrect results.
Note: Variables defined as type CHAR will not save memory space within the SCADA 3000.
Example:
char x;
main ()
{
x=12;
}
INT - Used to define a variable as an integer. An integer can hold a value from -32,768 to
+32,767 and must be a whole number. Exceeding this range will cause incorrect results. Note:
Variables defined as type INT will not save memory space within the SCADA 3000.
Example:
int result;
main ()
{
result=17;
}
FLOAT - Used to define a variable as a floating-point number. A floating-point number is one
that can have a fractional part (i.e., numbers after the decimal point). Floating-point numbers
can also be very large or very small, generally between 10-38 and 10+38. Numbers of this size
can be represented using exponential notation. In exponential notation, the significant digits
of a number are raised to a power of ten. The basic form comprises a signed series of digits
including a decimal point, followed by the letter E, and then by a signed exponent to indicate
the power of ten being used.
Examples:
1,987 = 1.987E3
120,000,000 = 1.2E8
.000000314 = 3.14E-7
-0.00000000005 = -5.0E-11