Rockwell Automation Logix5000 Controllers Structured Text Programming Manual - Manual (Page 33)

Publication 1756-PM007D-EN-P - November 2012 33
Program Structured Text Chapter 1
Example 2:
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Move ASCII characters from a SINT array into a string tag. (In
a SINT array, each element holds one character.) Stop when
you reach the carriage return.
1. Initialize Element_number to 0.
2. Count the number of elements in SINT_array (array that
contains the ASCII characters) and store the result in
SINT_array_size (DINT tag).
3. If the character at SINT_array[element_number] = 13
(decimal value of the carriage return), then stop.
4. Set String_tag[element_number] = the character at
SINT_array[element_number].
5. Add 1 to element_number. This lets the controller check
the next character in SINT_array.
6. Set the Length member of String_tag = element_number.
(This records the number of characters in String_tag so
far.)
7. If element_number = SINT_array_size, then stop. (You are
at the end of the array and it does not contain a carriage
return.)
8. Go to 3.
element_number := 0;
SIZE(SINT_array, 0, SINT_array_size);
While SINT_array[element_number] <> 13 do
String_tag.DATA[element_number] :=
SINT_array[element_number];
element_number := element_number + 1;
String_tag.LEN := element_number;
If element_number = SINT_array_size then
exit;
end_if;
end_while;