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F
Fieldbus
™
OUNDATION
December 2022
Figure 8-13: PID Equation: Standard and Series
Where:
GAIN Proportional gain value
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.
parameters and their descriptions, units of measure, and index numbers, and
Figure 8-14
Table 8-25: PID Function Block System Parameters
Parameter
ACK_OPTION
ALARM_HYS
168
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
illustrates the internal components of the PID function block.
Index number
46
47
Table 8-25
Units
None
Percent
Manual
00809-0500-4880
lists the PID block
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.
Emerson.com/Rosemount
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