Campbell Scientific CR9000X Measurement and Control System - Manual (Page 338)

Section 9. Program Control Instructions
For ... Next Statement
Repeats a group of instructions a specified number of times.
Syntax
For counter = start To end [ Step increment ]
[statementblock]
[
Exit For ]
[statementblock]
Next [counter [, counter][, ...]]
The For...Next statement has these parts:
PART DESCRIPTION
For Begins
a For...Next loop control structure. Must appear
before any other part of the structure.
counter Numeric variable used as the loop counter. If the variable
used is an index into an array, the index cannot be a variable
(e.g., Variable(1) can be used, but Variable(i) cannot).
start Initial value of counter.
To Separates
start and end values.
end Final value of counter.
Step Indicates that increment is explicitly stated.
increment Amount
counter is changed each time through the loop. If
you do not specify Step, increment defaults to one.
[statementblock] Program lines between For and Next that are executed the
specified number of times.
Exit For
Used within a For...Next control structure to provide an
alternate way to exit. Any number of Exit For statements
may be placed anywhere in the For...Next loop. Often used
with the evaluation of some condition (for example,
If...Then), Exit For transfers control to the statement
immediately following the Next.
Next Ends
a For...Next construct. Causes increment to be added
to counter.
The Step value controls loop execution as follows:
When Step is Loop executes if
Positive or 0 counter <= end
Negative counter >= end
Once the loop has been entered and all the statements in the loop have
executed, Step is added to counter. At this point, either the statements in the
loop execute again (based on the same test that caused the loop to execute in
the first place), or the loop is exited and execution continues with the statement
following the Next statement.
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