Rockwell Automation 57C610 Enhanced Basic Language, AutoMax - Manual (Page 44)

6Ć4
Recall that BASIC tasks always use the most current value of
common variables when performing calculations, while Control
Block and PC/Ladder Logic tasks latch the value of all simple
double integer, integer, and boolean variables. See section 4.0 for
more information.
Note that in the following examples, GLOBAL can be substituted for
COMMON.
COMMON Simple Variable Format
COMMON variable
where:
variable =
simple variable of double integer, integer, real,
string, or boolean type for common memory
locations; simple variable of double integer,
integer, or boolean type for common I/O
locations; more than one variable can be
defined with one statement by separating the
variables with commas
examples:
10 COMMON SPEED%
20 COMMON LIMIT%, START@, PROMPT$
COMMON Subscripted (Array) Variable Format
COMMON variable(size_list)
where:
variable = simple variable of any type, i.e., double integer,
integer, real, string, or boolean
size_list = up to five integer constants or integer variables
separated by commas, each value defining the
limit of the dimension of the array; expressions
that result in integer values are also permitted;
see section 4.1.2 for more information about
memory allocation for arrays; note that the first
item in every dimension is indicated in location
0, not 1
examples:
10 COMMON A%(10) [reserves space for 11 integer
ă ăelements]
20 COMMON B$:15(2,10) [reserves space for 33 string
ăăelements of 15 characters each maximum]
6.2 Program Documentation
BASIC allows you to insert notes and comments in a task. BASIC
provides two statements for this purpose, the REM and ! statements.
REM comment
OR
! comment
where:
comment = any text