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Loss of private path connection from Primary to Secondary (lonely event).
Failure Conditions That Result in a
Power to Primary chassis fails.
Integrated Control Protocol (ICP)
backplane in primary chassis fails
Any module in Primary chassis fails.
Both ControlNet drop cables to Primary
ControlNet module are lost.
Primary FIM fails.
Primary FIM's connection to Redundant
Remote Terminal Panel fails.
Primary RM fails.
Fieldbus network switchover considerations
The CIOM-A Fieldbus Interface Module (FIM) is a Link Master device running the link
schedule, performing network maintenance activities, publishing control data and
subscribing to control data, listening to alerts, and so on. All of these activities must be
transferred from one module to another during switchover. The redundant FIM operation
accounts for the following key considerations associated with initiating a H1 network
switchover.
For this Switchover Consideration . . .
Bumpless Switchover
R400
Experion PKS Series A Fieldbus Interface Module User's Guide
July 2010
Switchover
Honeywell
3. Fieldbus Integration With Experion System
3.7. CIOM-A FIM Redundancy Functionality
Failure Conditions That Do Not Result
in a Switchover
One or both H1 cables fail.
One or both H1 network conditioners fail.
The 24-Volt power supply fails.
FIM Redundancy Operation . . .
Assures that fieldbus devices do not:
Initiate a fault state,
Remote shed, or
Mode shed, during switchover.
The new Primary FIM does not publish
any data on the network until all
switchover actions are completed and it
has good data from the Control Data
Access (CDA) server.
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