Appendix C Redundancy; Sync Link And Database Synchronization - Honeywell CIU 888 Configuration Manual

APPENDIX C REDUNDANCY

NOTE: A failure in the Sync Link connection will disable a synchronization.
FIGURE C-5
Part No.: 4417584_Rev12
Appendix C - Redundancy
C.10 Sync Link and database synchronization
Redundancy between a pair of CIU 888s is realized by synchronizing
the databases
synchronization ensures that all recently measured data is available to
both CIU 888s and is required to minimize switch-over time.
To achieve real-time and continuous synchronization, a dedicated
Ethernet connection between the pair of CIU 888s must be established,
called the Sync Link. The Sync Link connection is also used to
determine the actual role of each CIU 888 (active or passive). To
establish the Sync Link connection, the CIU 888s have to be connected
by means of a Cat. 5. Ethernet cable.
In a redundant CIU 888 system setup, the following data stores are kept
synchronized:
Real-time data

Active gauge commands, including status

Configuration data

Operational data (manual overwrites and gauge commands)

Clock

The Sync Link port is located at the back of the CIU 888 (see
FIGURE C-5).
CIU 888: Sync Link port
Configuration Manual
CIU 888
of the CIU 888s. Real-time and continuous
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