IF OneShot in CLX Structured Text

Hey all, I'm kind of new to structured text programming and I'm trying to understand why a routine someone else wrote doesn't quite work. There is a FOR statement nested inside an IF statement. The IF condition is a one shot, which only remains high for a single scan. Does an iterative FOR statement require more than one "scan" to run? Is it one scan per iteration or one scan for the entire FOR loop? The code block I'm having a problem with is something like this:

IF OneShot THEN
FOR x := 0 TO 24 DO
Count3[x] := Count2[x];
Count2[x] := Count1[x];
Count1[x] := 0;
END_FOR;
END_IF;

It only seems to perform the first copy on array element [0] and doesn't copy the rest of the array elements, so I think I have to hold OneShot on for multiple scans until the FOR Loop finishes? But I just wanted to check before I go changing a production program.

Thanks!

The FOR_DO instruction, when enabled, repeatedly executes the Routine until the Index value exceeds the Terminal value. Should all happen in one scan.

This document https://literature.rockwellautomati...{"num":3581,"gen":0},{"name":"XYZ"},45,392,0] says the loop should run through all twenty-five values of x in each scan when OneShot is 1.


How are you determining that only the first array elements are assigned?