Emerson PACSystems RSTi-EP User Manual page 189

User Manual
GFK-2958J
Endless Counting
Figure 94: Continuous Counting
•
•
•
•
One-time Counting/ No primary Direction
Figure 95: 1-time Counting, Interrupted Counting
Detailed Description of I/O Modules
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.
Chapter 5
Oct 2019
174