DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-242
Chapter 5: Standard RLL Instructions
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Filter Over Time - Binary (FILTERB) (IB-402)
Filter Over Time in Binary (decimal) will perform a first-order filter on the Raw Data on a
defined time interval. The equation is
New = Old + [(Raw - Old) / FDC] where
New: New Filtered Value
Old: Old Filtered Value
FDC: Filter Divisor Constant
Raw: Raw Data
The Filter Divisor Constant is an integer in the range K1 to K100, such that if it equaled K1
then no filtering would be done.
The rate at which the calculation is performed is specified by time in hundredths of a second
(0.01 seconds) as the Filter Freq Time parameter. Note that this Timer instruction is embedded
in the IBox and must NOT be used any other place in your program. Power flow controls
whether the calculation is enabled. If it is disabled, the Filter Value is not updated. On the first
scan from Program to Run mode, the Filter Value is initialized to 0 to give the calculation a
consistent starting point.
FILTERB Parameters
• Filter Frequency Timer: specifies the Timer (T) number which is used by the Filter instruction
• Filter Frequency Time (0.01sec): specifies the rate at which the calculation is performed
• Raw Data (Binary): specifies the V-memory location of the raw unfiltered binary (decimal) value
• Filter Divisor (1-100): this constant used to control the filtering effect. A larger value will increase the
smoothing effect of the filter. A value of 1 results with no filtering.
• Filtered Value (Binary): specifies the V-memory location where the filtered binary (decimal) value
will be placed
DS
Used
HPP
N/A
Parameter
DL06 Range
Filter Frequency Timer
T
T0-377
Filter Frequency Time (0.01 sec)
K
K0-9999
Raw Data (Binary)
V
See DL06 V-memory map - Data Words
Filter Divisor (1-100)
K
K1-100
Filtered Value (Binary)
V
See DL06 V-memory map - Data Words
