Definitions of analog input function block system parameters (continued)Table 7-20:
Parameter Index number Units Description
STRATEGY 03 None The strategy field can be
used to identify grouping of
blocks. This data is not
checked or processed by the
block.
ST_REV 01 None The revision level of the
static data associated with
the function block. The revi-
sion value will be incremen-
ted each time a static pa-
rameter 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 da-
ta.
VAR_INDEX 39 % of OUT Range The average absolute error
between the PV and its pre-
vious 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 val-
ues, 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 chan-
nel in the transducer block.
If the units do not match,
the block will not transition
to MAN or AUTO.
7.8.2 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.
Foundation Fieldbus
Reference Manual 135
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