Page 80 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Revision 2.0
10. Fourth order polynomial based on PV
After the value of func is calculated, it is multiplied by GAIN, and then BIAS is added to
the result. Then, the high and low output limits are applied as per configured range scaling,
and PRE_OUT is updated with the calculated value. If the mode is AUTO, PRE_OUT is
copied to OUT.
Parameter List
Table 17: Arithmetic block parameters
Parameter Description
ST_REV The revision level of the static data associated with the function block.
The revision value increments each time a static parameter value in the
block is changed.
TAG_DESC The user description of the application of the block.
STRATEGY Used to identify grouping of blocks. This data is not checked of
processed by the block.
ALERT_KEY The identification number of the plant unit. This information may be used
in the host for sorting alarms, etc.
MODE_BLK The actual, target, permitted, ad normal modes of the block.
Target: The mode to “go to”
Actual: The mode the “block is currently in”
Permitted: Allowed modes that target may take
Normal: Most common mode for target.
BLOCK_ERR This parameter reflects the error status associated with the hardware or
software components associated with a block. It is a bit string so that
multiple errors may be shown.
PV It calculates the proportions of IN and IN_LO to for PV.
OUT The analog output value and status.
PRE_OUT Displays what would be the OUT value if the mode is AUTO or lower.
PV_SCALE The high and low scale values, the engineering units’ code, and the
number of digits to the right of the decimal point associated with the PV.
OUT_RANGE The high and low scale values, engineering units code, and number of
digits to the tight of the decimal point associated with OUT.
GRANT_DENY Options for controlling access of host computers and local control panels
to operating, tuning, and alarm parameters of the block. (Not used by
the device)
To Next Page
Loading...
