Nematron Pointe Controller - Manual (Page 160)

Chapter 5: Developing Controller Programs Pointe Controller User Guide
158
5.7.4 Repeat/Until Loop Block
The Repeat/Until Loop block represents a repetitive
process, where the block checks the condition at the
bottom of the loop, ensuring that the chart executes
the sequence of instructions at least once. If the
condition at the bottom of the loop is true, program
flow continues at the next block in the chart. If the
condition is false, control returns to the top of the loop.
PROPERTY WHAT YOU ENTER
Caption User label for the block.
Line Labels Until/Done/Repeat or Until/On/Off as the labels for the block and
outgoing flowlines.
Yield Yes or No to specify whether, when the condition tests false,
program flow should immediately return to top of the loop or
yield to the next listed Flow Chart. Use this option with caution,
since it essentially disables all other charts while the program
executes the loop.
A block that yields (Yes) runs all other charts in your Chart List ,
then returns to the top of the loop that yielded and retests the
block’s condition. A block that does not yield (No) continues to
check the condition, uninterrupted.
Condition Type Type of Condition:
Expression – Build a conditional expression using the
Build Condition dialog.
Diag Fault Bit Test – Select an Input, Memory, or Output
tag and test to see if its
Diag Fault Bit is set or clear.
If the condition evaluates true, then the Done/On line is followed.
If the condition evaluates false, then the Repeat/Off line is
followed.
Repeat/Until Loop Block Example
Before reaching this decision block, the program increments the value of Input_2.
The decision block then determines if Input_2 is greater than or equal to 20. If