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3. Fieldbus Integration With Experion System
3.7. CIOM-A FIM Redundancy Functionality
R400
Experion PKS Series A Fieldbus Interface Module User's Guide
81
July 2010
Honeywell
Switchover behavior considerations
The following table lists some display and control data behaviors in response to a CIOM-
A FIM switchover action.
For This CIOM-A FIM Related
Function . . .
The Related Switchover Behavior Is . . .
Fieldbus to Fieldbus Device
Communication
The "on-the-wire" control is
not
affected
by a
switchover. The new Primary FIM immediately
takes over as a Link Master and resumes
execution of the link schedule.
Control Data for
Fieldbus/Experion Control
Integration
Control data is
available immediately
after
switchover. This includes data for connections
in the fieldbus to C200 and in the C200 to
fieldbus directions. The FIM may substitute a
last known good value for publication to
fieldbus devices, while network connections
reform to C200 controller. Substitute value
functionality is bounded to a maximum of
five
seconds to account for worse case timing.
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