Emerson Rosemount 5900S Reference Manual page 145

Reference Manual
00809-0100-5900
ALARM_TYPE Allows one or more of the process alarm conditions detected by the AI
OUT_D
VAR_SCAN
VAR_INDEX
4.11.10 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 parameter. Set the filter time constant to zero to disable
the filter feature.
Figure 4-17: Analog Input Function Block Timing Diagram
A. FIELD_VAL
B. PV_FTIME
C. 63% of Change
D. PV
E. OUT (mode in auto)
F. OUT (mode in man)
G. Time (seconds)
Rosemount 5900S Radar Level Gauge
function block to be used in setting its OUT_D parameter.
Discrete output of the AI function block based on the detection of
process alarm condition(s). This parameter may be linked to other
function blocks that require a discrete input based on the detected alarm
condition.
Time period in seconds over which the variability index (VAR_INDEX) is
computed.
Process variability index measured as the integral of average absolute
error between PV and its mean value over the previous evaluation period.
This index is calculated as a percent of OUT span and is updated at the
end of the time period defined by VAR_SCAN.
Configuration
September 2019
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