EMBEDDED
PLC BL2500 User’s Manual
Running Sample Applications
OEM Technology Solutions
Page 28
6. Follow Steps 6 to 11 in 3.4.1 to create and populate the application’s Dictionary with SW1 and SW2
Boolean input variables, and LED1 Boolean output variable.
7. On
the
B25TEST3 – Programs
window double-click on
STtest1
program.
8. Type in a comment
in
comment parentheses
(* *) such as (* Exclusive OR logic for switching on
LED *). When entered correctly comments are highlighted green.
9. Press
Enter
to move to the next command line in the
ST program
editor.
10. To enter
Keyword commands
, either click the desired button in the Keywords
tool box or type it,
such as for an ‘if’ statement, either click
IF
in the Keyword tool box or type IF on the command line.
When correctly entered Keyword commands are highlighted pink.
11. To enter
inputs, outputs, or variables
, for example input switch SW1, either select Edit
→
Insert
variable
→
SW1 or type SW1 on the command line.
12. Type the following command lines under the entered comment:
IF SW1 = SW2
THEN
LED1 := FALSE;
ELSE
LED1 := TRUE;
END_IF;
13. The
LDtest1 program
should now appear as follows:
14. Save the program by selecting
File
menu
→
Save
. Press
OK
button on the
Update diary
window.
Close the
STtest1 – ST Program
window.
15. Follow Steps 17 to 25 in 3.4.1 to compile the application and download it to the Target PLC.
16. Double-click on
STtest1
program. The
STTEST1 – ST Programs
window is displayed. Press the
SW1 (short-circuit digital input IN00) and the LED1 will be turned ON as well as the state of LED1 in
the Programs window will change. The PLC program implements a Boolean XOR operation on SW1
and SW2 with the result set on the LED1.
17. To stop the monitoring of the PLC application, close the
Debugger
window. The programs and
dictionary windows in debug mode will be closed.