Emerson PACSystems RSTi-EP User Manual page 190

User Manual
GFK-2958J
Figure 96: 1-time Counting, Cancelled Counting
•
•
•
One-time Counting / Primary Direction Up
Figure 97: 1-time Counting, Primary Direction Up
•
•
Detailed Description of I/O Modules
Counting (up and down) starts at the load value, the entire counting range is used.
Upon exceeding the upper or lower count limit, the counter jumps to the other
count limit respectively. The internal gate is automatically closed, the status bit
Overflow performed, or Underflow performed is set and a process alarm will be
triggered if it is parameterized.
To restart counting, the internal gate must be reopened. Depending on the
parameters set, counting continues from the current counting value (Interrupt
counting) or it starts again from the load value (Cancel counting).
Up-counting starts at the load value.
If the parameterized end value -1 is reached during counting in the positive
direction, the counter jumps back to the load value at the next positive count pulse.
Chapter 5
Oct 2019
175