Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 244)

10Ć42
10.7.4 Errors Caused by the Array Shift Up and Array Shift Down Instructions
These errors can occur when you are using the ASU and ASD instructions in a
program. They are logged in the error log.
If this error occurs: Then: Do the following:
The array index is negative. ENO is set according to
ERROR_ENO, and element
zero of the array is used for
the instruction's operation.
Specify a valid array element.
The array index is too large. ENO is set according to
ERROR_ENO, and the last
element of the array is used
for the instruction's
operation.
Specify a valid array element.