User Manual Section 5
GFK-2958L May 2021
Detailed Description of I/O Modules 244
hysteresis until the counting value reaches the predetermined hysteresis limit. After leaving
the hysteresis range, hysteresis is reactivated only upon reaching the comparison condition
again.
After changing the hysteresis value, an active hysteresis remains active. The new hysteresis
value is active during the next hysteresis event.
The behavior of the status bit for hysteresis = 0 (hysteresis deactivated) and hysteresis = 3 is
shown in the following diagrams (legends describe the behavior for hysteresis = 3):
Figure 135: Operating principle of the Hysteresis with Counter Value ≥ Comparison
Value
1.
Comparison condition met
➝
status bit is set and hysteresis activated
2.
Comparison condition not met, leaving the hysteresis range
➝
status bit is reset
3.
Comparison condition met
➝
status bit is set and hysteresis activated
4.
Leaving the hysteresis range, the status bit remains set because the comparison
condition is still met
5.
Comparison condition no longer met but hysteresis still active
➝
status bit
remains set
6.
Comparison condition met, hysteresis still active
➝
status bit remains set
7.
Leaving the hysteresis range and comparison condition met
➝
status bit remains
set
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