Allen-Bradley Studio 5000 Logix Emulate User Manual

Overview of Structured Text Programming
Chapter 11
Rockwell Automation Publication MOTION-RM002H-EN-P-February 2018 657
Fault Conditions
A major fault will occur if Fault type Fault code
the construct loops too long 6 1
Example 1
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The WHILE_DO loop evaluates its conditions first. If the conditions are true, the
controller then executes the statements within the loop.
This differs from the REPEAT_UNTIL loop because the REPEAT_UNTIL loop
executes the statements in the construct and then determines if the conditions
are true before executing the statements again. The statements in a
REPEAT_UNTIL loop are always executed at least once. The statements in a
WHILE_DO loop might never be executed.
pos := 0;
While ((pos <= 100) & structarray[pos].value <> targetvalue)) do
pos := pos + 2;
String_tag.DATA[pos] := SINT_array[pos];
end_while;
Example 2
If you want this Enter this structured text
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.
Initialize Element_number to 0.
Count the number of elements in SINT_array (array that contains the ASCII
characters) and store the result in SINT_array_size (DINT tag).
If the character at SINT_array[element_number] = 13 (decimal value of the
carriage return), then stop.
Set String_tag[element_number] = the character at
SINT_array[element_number].
Add 1 to element_number. This lets the controller check the next character in
SINT_array.
Set the Length member of String_tag = element_number. (This records the
number of characters in String_tag so far.)
If element_number = SINT_array_size, then stop. (You are at the end of the
array and it does not contain a carriage return.)
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;

Allen-Bradley Studio 5000 Logix Emulate Specifications

General

Brand	Allen-Bradley
Model	Studio 5000 Logix Emulate
Category	Controller
Language	English