VIPA CPU 312SC, User Manual

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You pre-define the behavior of the counter output via the parameteri-
zation:
n No comparison
The output is set as normal output. The SFB input parameter
CTRL_DO is effect less. The status bits STS_DO and STS_CMP
(Status comparator in the instance DB) remain reset.
n Count
³
comparison value respectively Count
£
comparison value
The output remains set as long as the counter value is higher or
equal comparison value respectively lower or equal comparison
value. For this the control bit must be set. The comparison result
is shown by the status bit STS_CMP. This status bit may only be
reset if the comparison condition is no longer fulfilled.
n Pulse at comparison value
When the counter reaches the comparison value the output is set
for the parameterized pulse duration. If you have configured a
main count direction the output is only activated when the compar-
ison value is reached with the specified main count direction. For
this the control bit CTRL_DO should be set first. The status of the
digital output may be shown by the status bit ST_DO. The com-
parison result is shown by the status bit STS_CMP. This status bit
may only be reset if the pulse duration has run off. comparison
condition is no longer fulfilled. With pulse time = 0 the output is as
set as the comparison condition is fulfilled.
Pulse duration
For adaptation to the used actors a pulse duration may be speci-
fied. The pulse duration defines how long the output should be
set. It may be preset in steps of 2ms between 0 and 510ms. The
pulse duration starts with the setting of the according digital
output. The inaccuracy of the pulse duration is less than 1ms.
There is no past triggering of the pulse duration when the compar-
ison value has been left and reached again during pulse output. A
change of the pulse period during runtime is not applied until the
next pulse.
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:
Characteristics of the
output
Hysteresis
VIPA System 300S Deployment I/O periphery
Counter > Counter - Additional functions
HB140 | CPU-SC | 312-5BE13 | GB | 15-50 117