Honeywell Series A - Page 74

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