Rockwell Automation 57C610 Enhanced Basic Language, AutoMax - Manual (Page 45)

6Ć5
The ! format is interchangeable with the REM format for a comment;
however, the statements are treated differently by the compiler.
The ! format comments are downloaded with a task onto the
Processor module. Consequently, when that task is uploaded to the
operator's terminal at a later time, the comments can be
reconstructed along with the other program statements.
When the REM format comments are compiled, they are discarded
and consequently, they are not downloaded with the task. They are
not reconstructed and cannot be referenced with a GOTO or
GOSUB type transfer of control because they will not exist in the
executable task. The REM format comments serve only to document
the source file.
When programming critical applications, note that the ! format
comments use memory on the Processor module. ! statements
require a small amount of execution time even though they do not
actually execute.
The remark (REM) statement must be the only statement on a
program line. The remark (!) statement can be either the only
statement on a line or it can be one of several statements in a
multiĆstatement line as long as it is the last statement. REM and !
statements may be continued onto more than one line just like any
other statement:
10 ! THIS IS AN EXTREMELY LONG COMMENT &
SHOWING JUST HOW IT IS POSSIBLE TO &
CONTINUE A REMARK ACROSS SEVERAL LINES
10 ! This is an example of a series of several consecutive
20 ! ! statements used to form a block of comments.
30 ! These comments may contain any character except
40 ! a carriage return, for example: !@$%^&*() &
+~][}{`".,??&?>%$
10 REM This is an example of a series of several
20 REM consecutive REM statements used to form a
30 REM block of comments. These comments may
40 REM contain any character except a carriage
50 REM return, for example: !@$%&*()
60 REM +~][}{`",:/.,?\/%$@%%#'
The following is a valid remark statement because the remark is at
the end:
10 A% = B% -23: PRINT A%:! A REMARK
The following is an invalid remark statement because the remark is
not at the end of the statement:
10 REAL = 3.57: ! NEW REMARK: PRINT
The line number of a ! remark statement can be used in a reference
from another statement, such as a GO TO statement. BASIC only
displays the remarks on the personal computer when you edit the
program. See the GOTO (GO TO) statement in section 6.4.