Table 8-25: PID Function Block System Parameters
(continued)
Parameter Index number Units Descriptions
ALARM_SUM 45 None The summary alarm is
used for all process
alarms in the block. The
cause of the alert is
entered in the subcode
field. The first alert to
become active will set the
Active status in the Status
parameter. As soon as
the Unreported status is
cleared by the alert
reporting task, another
block alert may be
reported without clearing
the Active status if the
subcode has changed.
ALERT_KEY 04 None The identification number
of the plant unit. This
information may be used
in the host for sorting
alarms, etc.
ALG_TYPE 74 None Selects filtering algorithm
as backward or bilinear.
BAL_TIME 25 Seconds The specified time for the
internal working value of
bias to return to the
operator set bias. Also
used to specify the time
constant at which the
integral term will move
back to obtain balance
when the output is
limited and the mode is
AUTO, CAS, or RCAS.
BIAS 66 EU of OUT_SCALE The bias value used to
calculate output for a PD
type controller.
BKCAL_HYS 30 Percent The amount the output
value must change away
from its output limit
before the limit status is
turned off.
BKCAL_IN 27 EU of OUT_SCALE The analog input value
and status from another
block's BKCAL_OUT
output that is used for
backward output tracking
for bumpless transfer and
to pass limit status.
Manual FOUNDATION
™
Fieldbus
00809-0500-4880 December 2022
Rosemount OCX8800A 169
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