Filter Groups Workspace

The Filter Group tab contains the Filter Configuration expander that facilitates creation and configuration for a new filter group. You can configure the filter groups for value based filtering or for time interval logging. You can assign the filter group to a property in the Object Configurator tab.

On assigning a value-based filtering filter group to a property, the COVs of that property are filtered based on percentage or absolute value to optimize the data stored in the HDB. Only the COVs that are more or less than the previous logged value by an absolute/percentage value passes the filtering and is logged into the HDB.

On assigning a time interval logging filter group to a property, the COVs of that property are filtered based on interval and only the last COV received in the given interval is logged at the end of the interval to optimize the data stored in the HDB. If no COV is received in the given interval the COV logged in the previous interval is logged again at the end of the interval.

Value based filtering can only be used for integer, unsigned integer or floating point data points.

The precision of the deadband value is restricted to 3 decimal places. This can lead to small rounding differences inside filtering when using very fine segmentation of values. Consider this when configuring a filtering such as when a value changes from 50 to 55.001.

Filter Configuration Expander

The Filter Configuration expander facilitates creation and configuration of a new filter group.

Filter Configuration Expander
Item	Description
Name	Type a unique name for the filter group.
Description	Description of Filter Group.
Valid	Checked, by default. Uncheck the Valid check box to disable the filter group. Once disabled, even if this filter group is assigned to any property, the COVs are not filtered according to the filter group definition. Only repeating values are filtered.
Type	Value based filtering (Default), Time interval logging.
Deadband type - Percentage	(Default selection) Applicable for value based filtering filter group type. It is the percentage value by which the COV logging of the property is filtered. For example, if the current value of a property is 50 and you have set the Deadband Value as 10% then the next COV that is logged in the HDB has the value as > 55 or < 45. The COVs for 51, 52, till 55 and similarly for 49, 48, till 45 are not logged. NOTE 1: Percentage deadband value should be at least 1% or more. NOTE 2: Any change in the quality for the subsequent COVs will result in the value getting logged in the HDB even if it is within the deadband.
Deadband type - Absolute	Applicable for value-based filtering filter group type. Change the default selection to Absolute, when you want to filter the COV logging of the property by absolute value. For example, if the current value of a property is 50 and you have set the Deadband Value as 10 then the next COV that is logged in the HDB has the value as > 60 and < 40. The COVs for 51, 52, till 60 and similarly for 49, 48, till 40 are not logged. NOTE 1: Absolute deadband value should be atleast 0.001or more. NOTE 2: Any change in the quality for the subsequent COVs will result in the value getting logged in the HDB even if it is within the deadband.
Deadband value	Applicable for value based filtering filter group type. It can be a percentage or absolute value depending on the selected deadband type. Change the deadband value as required. 0.001 is the difference between the filter group percentage or absolute value configured and the value that gets qualified for COV logging.
Interval	Applicable for time interval logging filter group type. It is the duration for which the COVs are not logged into the HDB and only the last COV received in that duration is logged at the end of the duration. Interval can have one among the following values: 30 seconds 1 minute 5 minutes 10 minutes 15 minutes 30 minutes 60 minutes 24 hours For use cases, see Concept 6: Filtering with Value Filters in Examples of Archiving Concepts.

Filter Group Toolbar

The filter group toolbar facilitates you to configure the filter group.

Filter Group Toolbar
	Creates a new filter group.
	Deletes the filter group. If you have linked a filter group to a property, deleting the filter group de-links that filter group from the property.
	Saves the currently opened filter group.
	Saves the configuration of the currently selected filter group as a new filter group.