Emerson PACSystems RSTi-EP User Manual page 209

User Manual
GFK-2958J
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One-time Counting/ No Primary Direction
Figure 112: 1-time Counting, Interrupted Counting
Figure 113: 1-time Counting, Cancelled Counting
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Detailed Description of I/O Modules
Counting starts at the load value, the entire counting range is used.
If the upper count limit is reached during up-counting, an additional counting pulse
in the positive direction leads to a jump to the lower count limit. Counting continues
from there.
If the lower count limit is reached during down-counting, an additional counting
pulse in the negative direction leads to a jump to the upper count limit. Counting
continues from there.
Upon exceeding the upper or lower counting limit, the status bit Overflow
performed, or Underflow performed is set and a process alarm is triggered if it is
parameterized. The status bits remain set until they are reset with the bit Reset
status bits in the control word.
Counting (up and down) starts at the load value, the entire counting range is used.
Chapter 5
Oct 2019
194