User Manual
Section 5
GFK-2958L
May 2021
Detailed Description of I/O Modules
237
Counting Behavior: Interrupt/ Cancel Counting
You can parameterize the counting behavior after a new g
ate start: Using “Interrupt
counting”, the counter continues from the last counting value. Using “Cancel counting”,
counting starts again from the load value.
Endless Counting
Figure 126: Continuous Counting
•
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.
One-time Counting/ No Primary Direction
Figure 127: 1-time Counting, Interrupted Counting
