User Manual Section 5
GFK-2958L May 2021
Detailed Description of I/O Modules 217
Endless Counting
Figure 109: 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 110: 1-time Counting, Interrupted Counting
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