5.6.6.5 Counter output channel
Each counter has an output channel. You pre-define the behavior of the counter output
via the parametrization:
n no comparison:
–
The output is used as normal output.
– SFB 47:
The input parameter CTRL_DO is effect less.
The status bits STS_DO and STS_CMP (status comparator in the instance DB)
remain reset.
n Counter value ³ comparison value respectively counter value £ comparison value
– The output remains set as long as the counter value is higher or equal compar-
ison value respectively lower or equal comparison value.
– SFB 47:
Control bit CTRL_DO 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 parame-
trized pulse duration. When you've set a main counting direction the output is only
set at reaching the comparison value from the main counting direction.
If the pulse duration = 0, the output is set until the comparison condition is not
longer fulfilled.
– SFB 47:
Control bit CTRL_DO must be set.
The status of the digital output may be shown by the status bit ST_DO.
The comparison result is shown by the status bit STS_CMP. The bit may only be
reset if the pulse duration has expired.
n Pulse duration
– 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 comparison value has
been left and reached again during pulse output.
– If the pulse duration is changed during operation, it will take effect with the next
pulse.
– If the pulse duration = 0, the output is set until the comparison condition is not
longer fulfilled.
– Range of values: 0...510ms in steps of 2ms
5.6.6.6 Hysteresis function
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 underflow.
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 MICRO
Deployment I/O periphery
Counting > Counter - Additional functions
HB400 | CPU | M13-CCF0000 | en | 16-47 114
To Next Page
Loading...
