Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 285)

AĆ13
A.4 Arrays
Arrays in ladder programs can have only one dimension. An item within an array is
called an element.
This type of array: Can have a maximum of:
integer and double integer 65,536 elements
Boolean 16,000 elements
The maximum size of a local array or global array when no Common Memory module is
present is limited by the amount of available application memory. If a Common Memory
module is present, a global array is limited by the amount of memory available on the
module.
The first element within the array is always 0. Therefore, if an array had 65,536
elements, they would be numbered 0ć65,535. You define the size of an array by
entering a value in Maximum Array Index located within the Variable Properties tab.
The maximum array index is the number that represents the last element within an array
variable. When you enter a new array variable in an instruction parameter, the maximum
array index is automatically defined as the element number you entered as part of the
variable. Should you need a larger array, change the Maximum Array Index field of the
variable's property sheet. Remember array elements are numbered starting at 0.