Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 91)

Advanced Instruction Set
Chapter 6
6Ć34
WARNING: The counter address of the sequencer load
instruction should be reserved for that instruction. Do not
manipulate the counter accumulated or preset word. Changes to
these values could result in unpredictable machine operation or a
run-time error. Damage to equipment and/or injury to personnel
could occur.