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Periodic Counting/ No Primary Direction
•
Counting (up or down) starts at the load value, the entire counting range is used.
•
Upon reaching a count limit, the counter jumps back 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.
Periodic Counting/ Primary Direction Up
•
Up-counting starts at the load value.
•
If the parameterised 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 parameterised.
•
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 process alarm will be
triggered if it is parameterised. All status bits remain set until they are reset with the bit
"Reset status bits" in the control word.
GFK-2958E
Periodic Counting, No Primary Direction
Periodic Counting, Primary Direction Up
RSTi-EP User Manual
Chapter 5 Detailed Descriptions of I/O Modules
192
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