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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