Emerson Rosemount 2240S, Справочное руководство, Страница: 86 / 194

76
Reference Manual
00809-0100-2240, Rev DA
Configuration/Operation
October 2017
Configuration/Operation
5.10.4 Simulation
To perform lab test of process variables and alerts, you can either change the mode of the AI block to
manual and adjust the output value, or you can enable simulation through the configuration tool and
manually enter a value for the measurement value and its status. In both cases, you must first set the
SIMULATE switch (1) on the field device to the ON position, see
“Switches and reset buttons” on page 62 .
With simulation enabled, the actual measurement value has no impact on the OUT value or the status.
5.10.5 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 5-14. Analog Input Function Block Timing Diagram
PV_FTIME
63% of Change
OUT (mode in man)
OUT (mode in auto)
PV
Time (seconds)
FIELD_VAL