Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 251)

Shift Register Instructions
Chapter 13
13Ć8
WARNING: The counter address specified for FIFO Load
and FIFO Unload instructions should be reserved for these
instructions. Do not manipulate the counter accumulated or
preset values. Inadvertent changes to these values could result in
unpredictable or hazardous machine operation or run-time error.
Damage to equipment and/or personal injury could result.
To program FIFO load press keys [SHIFT REG] 14. A display represented
by Figure 13.5a will appear. To program FIFO unload press keys [SHIFT
REG] 15. A display represented by Figure 13.5b will appear.
Figures 13.6a and 13.6b show the format of Figures 13.5a and 13.5b after
entering the following conditions for the FIFO file shown in Figure 13.2.
COUNTER ADDR – 200
FIFO SIZE – 064
FILE – Starts and ends at words 400 and 477 respectively
INPUT ADDR – 130
OUTPUT ADDR – 040
There is no data monitor mode for the FIFO instructions.
13.3.1
Programming FIFO Load
and FIFO Unload Instruction