Emerson PACSystems RSTi-EP User Manual page 192

User Manual
GFK-2958J
Counting Range
Limits
End value
Upper count limit
Periodic Counting/ No Primary Direction
Figure 99: Periodic Counting, No Primary Direction
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Periodic Counting/ Primary Counting Direction Up
Figure 100: Periodic Counting, Primary Counting Direction Up
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Detailed Description of I/O Modules
Valid range of values
–2 147 483 648 (–2
+2 147 483 647 (2
Counting (up or down) starts at the load value, the entire counting range is used.
Upon reaching a count limit, the counter jumps to the load value and starts counting
again from there. The status bit Overflow performed, or Underflow performed is set
and a process alarm will be triggered if it is parameterized. All status bits remain set
until they are reset with the bit Reset status bits in the control word.
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
and continues counting from there. The status bit End value reached is set and a
process alarm will be triggered if it is parameterized.
Upon reaching the lower count limit the counter jumps to the upper count limit to
continue counting from there. The status bit Underflow performed is set and a
31 ) to +2 147 483 647 (2 31 – 2)
31 -1)
Chapter 5
Oct 2019
177