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System Functions
3.8 Other Functions
3.8
Other Functions
Signal Filtering and Chatter Blocking for Input Signals
3.8.1
Input signals can be filtered to suppress brief changes at the binary input. Chatter blocking can be used to
prevent continuously changing indications from clogging the event list. After an adjustable number of
changes, the indication is blocked for a certain period.
The settings for indication filtering can be found at the individual signals. The next figure shows the settings
using the example of a controllable (circuit-breaker switch position).
NOTE
i
i
For the circuit breaker or the disconnector, the settings of the software filter for spontaneous position
changes are available only in the Control/Command with feedback function block. These settings are not
available in the Circuit breaker or Disconnector function blocks since these function blocks contain the
actual unfiltered position of the switch in the bay.
[sclposi-260116, 1, en_US]
Figure 3-78
The setting range for the Software filtering time parameter ranges from 0 ms to 86 400 000 ms (1
day) in ms increments. The Retrigger filter check box can be used to select whether the software filter
should be restarted by a change from 1 to 0 and back. When activated, the Indication timestamp
before filtering check box back dates the time stamp by the set software filtering time and the fixed
hardware filtering time. In this case, the time stamp corresponds to the actual status change of the signal. If
you activate the Suppress intermediate position check box, the intermediate position is suppressed
for the duration of this software filter time.
With the parameter Spontaneous position changes filtered by, you set how such position
changes are to be filtered. Spontaneous position changes are caused by external switching commands, for
160
Settings for Circuit-Breaker Switch Position
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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