Emerson Rosemount OCX 8800 Reference Manual page 161

Table 7-27: PID function block system parameters
Parameter
ALERT_KEY
ALG_TYPE
BAL_TIME
BIAS
BKCAL_HYS
BKCAL_IN
BKCAL_OUT
Reference Manual
Index number
04
74
25
66
30
27
31
(continued)
Units
None
None
Seconds
EU of OUT_SCALE
Percent
EU of OUT_SCALE
EU of PV_SCALE
Foundation Fieldbus
Descriptions
The identification number
of the plant unit. This infor-
mation may be used in the
host for sorting alarms, etc.
Selects filtering algorithm as
backward or bilinear.
The specified time for the
internal working value of
bias to return to the opera-
tor set bias. Also used to
specify the time constant at
which the integral term will
move back to obtain bal-
ance when the output is
limited and the mode is AU-
TO, CAS, or RCAS.
The bias value used to calcu-
late output for a PD type
controller.
The amount the output val-
ue must change away from
its output limit before the
limit status is turned off.
The analog input value and
status from another block's
BKCAL_OUT output that is
used for backward output
tracking for bumpless trans-
fer and to pass limit status.
The value and status re-
quired by the BKCAL_IN in-
put of another block to pre-
vent reset windup and to
provide bumpless transfer
of closed loop control.
151