The pulse duration defines how long the output is set. It may be
preset in steps of 2.048ms between 0 and 522.24ms. The pulse dura-
tion starts with the setting of the according digital output. The inac-
curacy of the pulse duration is less than 2.048ms. There is no past
triggering of the pulse duration when the comparison value has been
left and reached again during pulse output.
The bit STS_DO is set together with the bit STS_CMP in
the counter status. In contrast to the bit STS_DO this bit
remains set as long as it is reset by setting the bit
RES_SET in the control word.
n The hysteresis serves the avoidance of many toggle processes of
the output and the interrupt, if the counter value is in the range of
the comparison value.
n For the hysteresis you may set a range of 0 to 255.
n The settings 0 and 1 deactivate the hysteresis.
n The hysteresis influences zero run, comparison, over- and under-
flow.
n An activated hysteresis remains active after a change. The new
hysteresis range is activated with the next hysteresis event.
The following pictures illustrate the output behavior for hysteresis 0
and hysteresis 3 for the according conditions:
1 Counter value ³ comparison value ® output is set and hysteresis
activated
2 Leave hysteresis range ® output is reset
3 Counter value ³ comparison value ® output is set and hysteresis
activated
4 Leave hysteresis range, output remains set for counter value ³
comparison value
5 counter value < comparison value and hysteresis active ® output
is reset
6 counter value ³ comparison value ® output is not set for hyste-
resis active
7 Leave hysteresis range, output remains set for counter value ³
comparison value
Hysteresis
Effect at counter value
³
comparison value
VIPA System SLIO Deployment
Counter additional functions
HB300 | FM | 050-1BA00 | GB | 14-36 55
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