ISPSoft User Manual

ISPSoft User Manual
• Description
A RETRUN statement is used in a function block in a structured text. It ends the program in the
function block.
• Example
The programming language used to create the program in the function block FB0 is a structured
text. After the upper part of the program is executed, the state of X0.0 will be judged. If X0.0 is ON,
the execution will leave the current program. If X0.0 is OFF, the whole program in the function
block will be executed.
11.2.11 EXIT Statement
• Format
• Description
An EXIT statement is used in a REPEAT loop, a WHILE loop, or a FOR loop. It is used to exit the
loop.
• Example
Example 1: The loop below is a REPEAT loop. The loop will not be terminated until the value of
DT is 0. The IF structure in the loop is used with an EXIT statement. The initial value
in D0 is 0. It increases by 1. The loop will not be terminated until the value in D0 is
100. As a result, the loop body will be executed 100 times at most. In the example
below, the initial value of DT is 110. After the loop body is executed for the 100 th time,
the value of DT will become 10. In other words, the final value of DT will be 10. The
value of DT will not decrease to 0.
Example 2: The loop below is a FOR loop. The value of the arithmetic expression D0* D10 is
calculated, and the result of the operation is stored in D0. The IF structure in the loop
is used with an EXIT statement. The loop will not be terminated until the value in D0 is
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