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™ PD6088/PD6089 Modbus
®
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Instruction Manual
51
Noise Filter (
filter
)
Most applications do not require changing this
parameter. It is intended to help attain a steady
display with unsteady (noisy) input data. The field
selectable noise filter averages any minor or quick
changes in the input data and displays the reading
with greater stability. Increasing the filter value will
help stabilize the display. However, this will reduce
the display response to changes on the input data.
The filter level may be set anywhere from 2 to 199.
Setting the filter value to zero disables the filter
function, and the bypass setting becomes irrelevant.
This parameter is associated with the analog input
channels.
Noise Filter Bypass (
bypass
)
The scanner can be programmed to filter small input
changes, but allow larger input changes to be
displayed immediately, by setting the bypass value
accordingly. If the input signal goes beyond the
bypass value, it will be displayed immediately with no
averaging done on it. The noise filter bypass value
may be set anywhere from 0.2 to 99.9. Increasing the
bypass value may slow down the display response to
changes on the input signal. This parameter is
associated with the analog input channels.
Rounding Feature (
round
)
The rounding feature is used to give the user a
steadier display with fluctuating signals. Rounding is
used in addition to the filter function. Rounding
causes the display to round to the nearest value
according to the rounding criteria selected by the
user. This setting affects the last three digits,
regardless of decimal point position.
Select Menu (
SELect
)
The
Select
menu is used to select the input data
linearization function (linear, square root,
programmable exponent, or round horizontal tank),
math functions, constants, low-flow cutoff, and analog
output programming. Multi-point linearization is part of
the linear function selection.
Input Data Conditioning Function
Menu (
Functn
)
The
Function
menu is used to select the input-to-
output transfer function applied to the input data:
linear, square root, programmable exponent, or round
horizontal tank volume calculation. Multi-point
linearization (for PV1 and PV2) is part of the linear
function selection. Scanners are set up at the factory
for linear function with 2-point linearization. The linear
function provides a display that is linear with respect
to the input data (e.g 0.000 = 0.000, 10.000 = 10.000,
and then 5.000 = 5.000).
