Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations User Manual
Page 80

Advanced Instruction Set
Chapter 6
6Ć23
last group of words is operated upon. At the same time, the done bit is set and
stays set for one scan. During the next scan the done bit is reset, and the
counter is reset to position 001.
Incremental Mode
In the incremental mode, the rate per scan is equal to 0. This means that upon
each false-to-true transition one word is operated upon per scan, then the
counter increments to the next position. When the rung is true the enable bit
(bit 17) is set. After the last word in the file has been operated upon, the done
bit (bit 15) is set. When the rung goes false, the done and enable bits are reset
(after the last word has been operated upon), and the counter is reset to position
001. If the rung remains true for more than one scan, the operation does not
repeat. The operation only occurs in the scan in which the false-to-true
transition occurs.
To change from one mode to another use Table 6.B to determine the values:
Table 6.B
Changing Modes
To change:
Enter the Rate
per Scan Value:
Complete to Distribute Complete
001 thru 006
Distributed Complete to Incremental
000
Distributed Complete to Complete
007
Incremental to Complete
007
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