Filtering; Direct - Emerson FIELDVUE DVC6200f Instruction Manual

DVC6200f Digital Valve Controller
4
Uncertain if in Manual mode—The status of the
Output is set to Uncertain when the mode is set to
Manual.
Note
1. The instrument must be in Out of
Service mode to set the status option.
2. The AI block only supports the
Uncertain if in Manual and Propagate
failure. Unsupported options are not
grayed out; they appear on the screen
in the same manner as supported
options.

Filtering

The filtering feature changes the response time of the
device to smooth variations in output readings caused
by rapid changes in input. You can adjust the filter
time constant (in seconds) using the PV_FTIME [18]
160
ANALOG
MEASUREMENT
ACCESS
HI_HI_LIM
ANALOG
HI_LIM
MEAS.
LO_LO_LIM
LO_LIM
CHANNEL
ALARM_HYS
LOW_CUT
CONVERT
SIMULATE
L_TYPE
FIELD_VAL
OUT_SCALE
XD_SCALE
NOTES:
OUT_D = BLOCK OUTPUT VALUE AND STATUS
OUT_D = DISCRETE OUTPUT THAT SIGNALS A SELECTED ALARM CONDITION.
Figure 4-24. Analog Input Function Block Schematic
ALARM_TYPE
ALARM
DETECTION
CUTOFF FILTER
PV
STATUS
PV_FTIME
MODE
IO_OPTS
STATUS_OPTS
parameter. Set the filter time constant to zero to
disable the filter feature.
Signal Conversion
You can set the signal conversion type with the
Linearization Type (L_TYPE [16]) parameter. You can
view the converted signal (in percent of XD_SCALE
[10]) through the FIELD_VAL [19] parameter.
100 X (Channel Value) − EU *@0%
FIELD_VAL =
(EU *@100% − EU *@0%)
You can choose from direct, indirect, or indirect
square root signal conversion with the L_TYPE [16]
parameter.

Direct

Direct signal conversion allows the signal to pass
through the accessed channel input value (or the
simulated value when simulation is enabled).
PV = Channel Value
OUT_D
OUT
CALC.
*XD_SCALE values
November 2010