en:software:qview:qview_6:ladder_library:20201

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Function name LPFIL_010
Function version 1.0
Function state stable
Compatibility with IEC61131-3 not compatible

Graphic symbol :

Input / Output :

Name Belonging Group Access Types of data Description
Active Left Power Flow State of activation/deactivation filter intervention
IN Normal W , RW F , B , W , L , S Variable to filter
TS Normal W , RW F , B , W , L , S Sample time filter
TAU Normal W , RW F , B , W , L , S Tau filter
Q Normal W , RW F , B , W , L , S Filtered value

Description :

The function block LPFIL is used to obtain a first order low pass filter. If the input Active (power flow) is ON in Q you’ll have the filtered value of IN, otherwise you’ll have the value of direct IN beyond the loading of the filter. IN must have values comprised between –32768 and +32767. The time constant of the filter is defined in the input TAU (in ms). Suppose to start from an input value of zero, the output Q of the filter will get a value of 63% of the input after the time TAU.

The function block LPFIL contains a timer inside make the filter work at each sample time. This sample time is set through the input TS (in ms).


  • Last modified: 2019/08/29 17:01