Rockwell Automation 57C610 Enhanced Basic Language, AutoMax - Manual (Page 29)

4Ć9
4.2.2 Hexadecimal Constants
A hexadecimal constant also specifies an integer value in base 16 or
hex" (hexadecimal) format. A hexadecimal number has three parts:
0NNNNNNNNH
where:
1. A leading zero (0) is required if the first digit of the hexadecimal
number is an alphabetical character (A through F) so that BASIC
can distinguish it as a number and not a variable name. A
leading zero may also be used in front of a numeric character in
the hexadecimal number just as in a normal integer constant
(0987H = 987H)
2. The eight Ns represent the 8 hexadecimal (hex) digits in the
range 0 through F.
3. The trailing character H" indicates that the number is
hexadecimal and is always required.
The following are correct hexadecimal numbers:
098FCE2H
0FFEEC1H
0BEEFC2H 400B3C2H
99987H
The following are invalid hexadecimal numbers and the reasons that
they are invalid:
FEC002H (Does not start with zero in front of the alpha hex
character F.)
9800BE Does not end with H.)
3FFFFE342H (Larger than maximum double integer.)
BASIC hexadecimal numbers must fall in the range from zero to
0FFFFFFFFH. Hexadecimal constants are stored by BASIC exactly
as they are specified, with leading zeros filling in any of the eight hex
digits not specified for a double word or 32Ćbit format. This means
the numbers must be specified as 2's complement signed numbers.
For example, BASIC will load the hex constant 0F371H as
0000F371H. It will not signĆextend the number to 0FFFFF371H. If the
number 0FFFFF37H is desired, the entire 8 hex digits must be
specified. If you specify a number outside the appropriate range
(0FFFFFFFFH), the compiler will print an error on the screen.