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How the FM 450-1 Counts
Periodic Counting
2
2-4
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In periodic counting, the counter starts from the load value. When the
counter reaches the upper limit when counting up, and if a another count
pulse comes, it jumps to the load value and starts to add the count pulses
again.
If a counter reaches the lower limit when counting down, and if another
count pulse comes, it jumps to the load value and continues to count down
from there.
Counter status
Upper count limit
Load value
Lower count limit
Figure 2-3
Periodic Counting in the Up Direction
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Time
FM 450-1 Counter Function Module
C79000-G7076-C450-01
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