Honeywell Experion PKS Series A, User Manual, Page: 82 / 560

3. Fieldbus Integration With Experion System
3.7. CIOM-A FIM Redundancy Functionality
82 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
For This CIOM-A FIM Related
Function . . .
The Related Switchover Behavior Is . . .
Display Data Display data may not be available for several
seconds during switchover. Typically, five
seconds is the time required to refresh a
display after switchover. Exact behavior of
display data during switchover will be different
on a per-configuration and per-device basis.
After a FIM switchover, display clients such as
Control Builder and Station must reform
connections to the new primary FIM. The FIM
then processes requests from reconnected
clients. It populates the FIM parameter cache
by issuing read requests on the H1 network for
device parameter data. As the read requests
complete and the FIM parameter cache is filled,
display traffic resumes. The time to recover
display data is affected by the following things:
The bandwidth available on the H1 link for
unscheduled traffic,
The number of display requests received
by the FIM,
Use of views within the fieldbus device,
and
Third-party fieldbus device behavior,
including time required to reopen
client/server VCRs.
Failure conditions and switchover
The following table identifies failure conditions that result in a switchover and those that
do not.
ATTENTION
When any failure that results in a switchover occurs in a Secondary, the
Secondary chassis/FIM loses synchronization.
In addition to the failure conditions, these events are reported as diagnostic
notifications:
Loss of view of redundant partner on H1 network (applies to FIM link).