PID equation: Standard and SeriesFigure 7-13:
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. Table 7-27 lists the PID block parameters and their descriptions,
units of measure, and index numbers, and Figure 7-14 illustrates the internal components
of the PID function block.
PID function block system parametersTable 7-27:
Parameter Index number Units Descriptions
ACK_OPTION 46 None Uses to set auto acknowl-
edgement of alarms.
ALARM_HYS 47 Percent The amount the alarm value
must retrun to within the
alarm limit before the asso-
ciated active alarm condi-
tion clears.
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 be-
come active will set the Ac-
tive status in the Status pa-
rameter. As soon as the Un-
reported status is cleared by
the alert reporting task, an-
other block alert may be re-
ported without clearing the
Active status if the subcode
has changed.
Foundation Fieldbus
150 OCX 8800
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