Rockwell Automation 1747-PBASE BASIC Development Software Programming Manual - Manual (Page 73)

1 Publication 1746-PM001A-US-P
Chapter
6
Writing Programs Using the BASIC Development
Language
This chapter is designed to help you write programs using the BASIC development
language. It begins with an overview of the language. Other topics include:
•
translator directives
•
keystroke and programming macros
•
program integration from separate files
•
second program creation
Overview of the
Language The BASIC Language Reference Manual (publication number
1746-RM001A-US-P) and the SLC 500™ BASIC and BASIC-T Modules User
Manual (publication number 1746-UM004A-US-P) define the syntax that
provides the core of the BASIC development language. This core is then enhanced
by the addition of translator directives and programming macros, all structured to a
simple, open format that requires no line numbers. Descriptive label references are
used as destinations for transferring control, instead of line numbers.
As an example, a BASIC development language program for printing the date is
shown below. It uses a translator directive and a programming macro, and
translates to about nine lines in BASIC. That means if you were not using the
BASIC development language, instead of typing the three lines on the left, you
would have to type in the eleven lines on the right.
REM EXAMPLE PROGRAM 0 REM ...
{$I INCLUDE.BDL} 10 REM EXAMPLE PROGRAM
PRINT_DATE() 20 PUSH A
30 CALL 44
40 POP A
50 P. A,”/”,
60 POP A
70 P. A,”/”,
80 POP A
90 P. A,” ”,
100 POP A