Phonetics Sensaphone SCADA 3000, User Manual

Page: 197 / 336

PReDeFINeD VARIABLeS
SCADA 3000’s C language has several variables that are predefined. These variables are
automatically updated with the proper information outside of the C program and cannot be
changed by the user. They include:
input year
output month
timer day
counter day_of_week
bit hours
ladder_variable minutes
c_variable seconds
alarm off
diagnostic
mONTH, DAY, YeAR, HOURS, mINUTeS, & SeCONDS
These variables represent the values from the real-time clock. They are defined as integer
type. Their internal definitions look like the following:
int year;
int month;
int day;
int day_of_week;
int hours;
int minutes;
int seconds;
Note
: You do not need to define these at the beginning of your program to use
them.
Description:
YEAR —Holds the present value from 1999 to 2100.
MONTH —Holds the present value from 1 to 12.
DAY —Holds the present value from 1 to 31.
DAY OF WEEK —Holds the present value from 0(Monday) to 6(Sunday).
HOURS —Holds the present value in 24 hour time from 0 to 23.
MINUTES & SECONDS
—Holds the present value from 0 to 59.
Example : This program will turn on output 0 at midnight.
main ()
{
if ((hours==23)&&(minutes==59))
{
write_uaf(output,0,0,on);
}
}
16-7
Chapter 16: Programming in C