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3. Fieldbus Integration With Experion System
3.6. Notification Scheme
74
Experion PKS Series A Fieldbus Interface Module User's Guide
R400
Honeywell
July
2010
notification system. The following table summarizes the possible fieldbus alarm
enumerations and lists the alarm/event type identification to be used in the alarm
summary and event summary displays in Station.
ATTENTION
Only the first alarm in an overlapping series of alarms associated with
BLOCK_ERR and XD_ERROR bitstring alarms is reported due to a flaw in
the Fieldbus Foundation Specifications regarding the alert state machine.
This has been reported to the Fieldbus Foundation through their Action
Request system and the Foundation has agreed to permit future devices to
issue alerts on changes to the status of any element of these bitstring alarms.
If no more than one of the bits is set at a time, the alarms are reported and
cleared properly
TIP
Fieldbus alarm functions do not support rate of change (ROC) alarms. ROC
alarms can only be generated in applications that use Control Builder Data
Acquisition blocks for input signal conditioning.
Enumeration Description
Alarm/Event
Type
UNDEF
Undefended Alarm
No Action
LO
Low Limit Alarm
PVLO
HI High
Limit
Alarm
PVHI
LO LO
Critical Low Limit Alarm
PVLOLO
HI HI
Critical High Limit Alarm
PVHIHI
DV LO
Deviation Low Alarm
DEVLO
DV HI
Deviation High Alarm
DEVHI
DISC
Standard Discrete Alarm
OFFNORM
DISC
Standard Discrete Alarm
CHNGOFST
DISC
DevCtl Fail Alarm
FBDCFAIL
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