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Manual
00809-0500-4881
Figure 8-13: PID Equation: Standard and Series
Where:
GAIN
t
r
s
d
a
F
e
To further customize the block use for your application, you can configure filtering,
feedforward inputs, tracking inputs, setpoint and output limiting, PID equation structures,
and block output action.
units of measure, and index numbers, and
of the PID function block.
Table 8-25: PID Function Block System Parameters
Parameter
ACK_OPTION
ALARM_HYS
ALARM_SUM
Rosemount OCX8800C
Proportional gain value
Integral action time constant (RESET parameter) in seconds
A place operator
Derivative action time rate constant (RATE parameter)
Fixed smoothing factor of 0.1 applied to RATE
Feedforward control contribution from the feedforward input (FF_FVAI parameter)
Error between setpoint and process variable
Table 8-25
Index number
46
47
45
lists the PID block parameters and their descriptions,
Figure 8-14
illustrates the internal components
Units
None
Percent
None
F
Fieldbus
™
OUNDATION
April 2023
Descriptions
Used to set auto
acknowledgement of alarms.
The amount the alarm
value must return to within
the alarm limit before
the associated active alarm
condition clears.
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.
141
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