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configuration
5-15
5.6
56.1
Filtering Analog Inputs
5.6.2
Function
FCODE
Option
No
Default
Selected
ValW?
WW
DO1 (A/M)
129
open
1
1
Active State
Closed
2
DO2 (WL)
130
open
1
1
Active State
Closed
2
DO3 (Aim)
131
Open
1
1
Active State
Closed
2
DO4 (Alm)
132
open
1
1
Active State
Closed
2
Process
Value (PV) Handling
Always hard wire the PV to the controller
at analog
input All.
The
controller
can monitor,
filter, calculate
or linearize
this value before it is
employed
in the controller
algorithm.
Analog-to-digital
(A/D)
conversion
of the PV has an accuracy
of 0.025 percent
of the 0 to
20mA input.
FCODE
143 value determines
how the process
value appears
on the
digital
display.
Set this value to 1 for a display
in physical
units, and 2
thru 5 for percentage
display.
Function
FCODE
Option
No
Default
Selected
Value
VallJe
Normal
143
Display process value
1
1
Display
Display All, in percent
2
Display Al2, in percent
3
Display Al3, in percent
4
Display Al4, in percent
5
Select
a first-order,
low-pass
filter for the individual
PV inputs via
FCODE
15 thru 18. Set the value of the FCODE
to indicate
the analog
time constant
in seconds,
from 0 to 9999. Set the value to 0 to disable
the filter.
Function
Parameters
FCODE
Range
Unit
Increment
Default
Selected
V&X
Value
Analog
Time constant
All
15
o-9999
s
IS
Input
Time constant Al2
16
O-9909
s
15
i
Filter
Time constant Al3
17
O-9999
s
15
0
Time constant Al4
18
o-9999
s
IS
0
Process Value Calculation
The analog
input values can be conditioned
to provide
a required
input to the controller.
Square-root
linearization
can be applied,
for
example,
in flow measuring
with differential
pressure
sensors.
The
control
provides
onboard
selectable
square-root
extraction.
May 1991
UM6.1:DPR900'9102
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