Table 8-25: PID Function Block System Parameters
(continued)
Parameter Index number Units Descriptions
RCAS_OUT 35 EU of PV_SCALE Block setpoint and status
after ramping, filtering,
and limiting that is
provided to a supervisory
host for back calculation
to allow action to be
taken under limiting
conditions or mode
change. Used when mode
is RCAS.
RESET 24 Seconds per repeat The integral action time
constant.
ROUT_IN 33 EU of OUT_SCALE Target output and status
that is provided by a
supervisory host. Used
when mode is ROUT.
ROUT_OUT 36 EU of OUT_SCALE Block output that is
provided to a supervisory
host for a back calculation
to allow action to be
taken under limiting
conditions or mode
change. Used when mode
is RCAS.
SHED_OPT 34 None Defines action to be taken
on remote control device
time-out.
SP 08 EU of PV_SCALE The target block setpoint
value. It is the result of
setpoint limiting and
setpoint rate of change
limiting.
SP_FTIME 69 Seconds The time constant of the
first-order SP filter. It is
the time required for a 63
percent change in the IN
value.
SP_HI_LIM 21 EU of PV_SCALE The highest SP value
allowed.
SP_LO_LIM 22 EU of PV_SCALE The lowest SP value
allowed.
SP_RATE_DN 19 EU of PV_SCALE per
second
Ramp rate for downward
SP changes. When the
ramp rate is set to zero,
the SP is used
immediately.
FOUNDATION
™
Fieldbus Manual
December 2022 00809-0500-4880
174 Emerson.com/Rosemount
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