Revision 4 Foundation Fieldbus RMA803 Remote Indicator User's Guide Page 59
Parameter list
Table 20: PID block parameters
Parameter Description
ST_REV The revision level of the static data associated with the function
block. The revision value is incremented 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 or
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, and 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 on
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 The process variable used in block execution.
SP It is the target block setpoint value. It is the result of setpoint limiting
and setpoint rate of change limiting.
OUT The block input value and status.
PV_SCALE The high and low scale values, engineering units code, and number
of digits to the right of the decimal point associated with PV.
OUT_SCALE The high and low scale values, engineering units code, and number
of digits to the right 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.
CONTROL_OPTS Specify control strategy options. The supported control options for
the PID block are Track enable, Track in Manual, SP-PV Track in
MAN, SP-PV Track in LO or IMAN, Use PV for BKCAL_OUT, Direct
Acting, SP Track retain, SP-PV Track Out, Restrict SP to limits in
CAS and RCAS, No output limits in MAN.
STATUS_OPTS It helps to select options for status handling and processing. The
supported status option for the PID block is Target to Manual if Bad
IN. IFS if Bad IN, IFS if Bad CAS_IN, Use Uncertain as Good,
Target to next permitted mode if Bad CAS_IN, Target to MAN if Bad
TRK_IN_D and IFS if Bad TRK_IN_D.
IN The connection for the PV input from another block.
PV_FTIME The time constant of the first-order PV filter. It is the time required
for a 63 percent change in the IN value.
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