Emerson Rosemount OCX 8800 Reference Manual page 141

manually. The Manual mode is reflected on the output status. A discrete output (OUT_D) is
provided to indicate whether a selected alarm condition is active. Alarm detection is based
on the OUT value and user specified alarm limits.
and their units of measure, descriptions, and index numbers.
Table 7-20: Definitions of analog input function block system parameters
Parameter
ACK_OPTION
ALARM_HYS
ALARM_SEL
ALARM_SUM
ALERT_KEY
Reference Manual
Index number
23
24
38
22
04
Table 7-20 lists the AI block parameters
Units
None
Percent
None
None
None
Foundation Fieldbus
Description
Uses to set auto acknowl-
edgement of alarms.
The amount the alarm value
must return within the
alarm limit before the asso-
ciated active alarm condi-
tion clears.
Used to select the process
condition alarms that will
cause the OUT_D parameter
to be set.
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 alart 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 Ac-
tive status if the subcode
has changed.
The identification number
of the plant unit. This infor-
mation may be used in the
host for sorting alarms, etc.
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