Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 197)

Monitoring Controller Operations
Chapter 12
12–11
3. Increment the counter by turning on I:1/0. The accumulator value equals
the preset value, the done bit DN (bit 13) is set, and rung 2 is true.
4. Increment the counter again. The is in an overflow condition, setting the
overflow bit OV (bit 12). Rung 3 in the ladder program is true. The
display changes as follows:
Counter C5:0
CU
CD DN OV UN UA
STATUS 0 0 1 1 0 0
PRESET 32767
ACCUM –32768
STATUS=–32768 RUN
F1 F2 F3 F4 F5
NEXT_PG PREV_PG ADDRESS NEXT_FL PREV_FL
The accumulator is on the 32768th count, shown as –32678. As the count
continues to increment, the accumulator shows negative numbers of
decreasing absolute value.