Table 8-19: Definitions of AI Function Block System Parameters
(continued)
Parameter Index number Units Description
ST_REV 01 None The revision level of the
static data associated
with the function block.
The revision value will be
incremented each time a
static parameter value in
the block is changed.
TAG_DESC 02 None The user description of
the intended application
of the block.
UPDATE_EVT 20 None This alert is generated by
any change in the static
data.
VAR_INDEX 39 % of OUT Range The average absolute
error between the PV and
its previous mean value
over that evaluation time
defined by VAR_SCAN.
VAR_SCAN 40 Seconds The time over which the
VAR_INDEX is evaluated.
XD_SCALE 10 None The high and low scale
values, engineering units
code, and number of
digits to the right of the
decimal point associated
with the channel input
value.
The XD_SCALE units code
must match the units
code of the measurement
channel in the transducer
block. If the units do not
match, the block will not
transition to MAN or
AUTO.
8.8.2 Simulation
To support testing, you can either change the mode of the 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.
With simulation enabled, the actual measurement value has no impact on the
OUT value or the status.
FOUNDATION
™
Fieldbus Manual
December 2022 00809-0500-4880
152 Emerson.com/Rosemount
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