5.5 Filters
5.5.1 [380] PT1 element
Type Function Type Function
I1 % Input value
O1 %
) e 1 ( 1 IO 1
1P
t
−
−×=
I2 % Start value O2 % inverted output = -1
I3 b Master Set P1 i Filter time constant in ms
I4 b Master Reset P2 - -
Description:
The input value at I1 is filtered.
1P
t
−
−×=− =
−
The filter time constant P1 indicates how long it takes in the case of a constant input value
until the output value (starting from zero) reaches 63% of the input value.
− Master Set: TRUE sets the output to the start value. The start value can be defined via input
I2.
− Master-Reset: TRUE sets the output to 0.
− Master Reset has priority over Master Set.
If the filter is to be stopped, input 2 must be combined with the output and the Master Set in-
put (I3) must be activated.
I2=O1, I3=TRUE
Note:
Percentages [%] have two decimals.
For example: Value 12345
IN
= 123.45% = 1.2345
5.5.2 [381] Time average
Type Function Type Function
I1 % Input value
O1 %
n
II I I
n
I
O
n
n
i
i
1...111
1
1
321
1
+ +++
==
∑
=
I2 - - O2 % inverted output = -1
I3 - - P1 - -
I4 b Master Reset P2 - -