Rockwell Automation 57C610 Enhanced Basic Language, AutoMax User Manual
Page 30
4Ć10
4.2.3
Real Constants
A real constant is a number with a decimal point. For large numbers,
use scientific notation in the following general format: a sign, digits,
a decimal point, digits, an E," a sign, and digits. Take, for example,
the following real constant example:
-1234.5678E+11
The E" is a real constant which means times ten to the" followed
by the power" or exponent. In the real constant 34.99876E+07, the
E" means times ten to the 7th. There must always be a number in
front of the E" when the E" is used (E+13 by itself is illegal.). Only
8 digits of significance are used to store the number. The total
number of digits on the left and right side of the decimal point must
be less than or equal to 8.
As with the real variable, the real constant can have a value in the
range:
9.2233717 x 10
18
> positive value > 5.4210107 x 10
-20
-9.2233717 x 10
18
< negative value <-2.7105054 x 10
-20
All of the values listed below represent the number one hundred
twenty:
120
ă0000120.00
+.120E+03
120.
1200000.00EĆ0004
0.000120E6
+120.
ă120E3
1200000EĆ4
4.2.4
String Constants
String constants are sequences of alphanumeric and other printable
characters. Line terminators (
constants must be enclosed either in single or double quotes. If one
type of quotes is used in the sequence itself, the other type must be
used to enclose the sequence. String constants may be up to 132
characters long.
A BASIC string prints every character between quotation marks
exactly as you type it into the source program. This includes the
following:
1. Letters (A-Z)
2. Leading, trailing, and embedded spaces
3. Tabs
4. Special characters (\, ?, !, etc.)
Note, however, that the actual BASIC string does not contain the
delimiting quotation marks.
The following are valid string constants:
THIS IS A STRING CONSTANT."
SO IS THIS."
THIS IS A MESSAGE!*/??"
HERE IS A `QUOTE' FROM SOMEONE'" (Note the embedded
single quote.)
`HE SAID GOODBYE" TODAY' (Note the embedded double
quotes.)