Become Primary Command - Becmpricmd; Redundancy History - Honeywell C300 User Manual


Secondary controller failure.

Removal of the powered Secondary controller module from its IOTA.

Inserting any controller module into a powered Secondary IOTA.

Loss of a single FTE link to Primary controller.

Loss of a single IOL channel connected to Primary C300 I/O Link.

Data communication failures with Secondary controller during synchronization.

Become Primary command - BECMPRICMD

The Become Primary command is used to cause an unsynchronized secondary module to
transition into the primary role in the absence of a partner module. Specifically, this
command applies only if the unsynchronized secondary has no view to a partner module
across the redundancy cable and the primary IP address is not occupied.
8.7

Redundancy history

The C300 and Series 8 FIM support a table with 16 entries of redundancy history. There
are 3 columns representing redundancy history time, state, and reason. The controller
internally implements a circular list so that only the most recent 16 entries are retained
once the number of redundancy history exceeds 16.

RDNHISTTIME - Redundancy History Time. The system time captured at the time
the entry was added to the table.

RDNHISTSTATE - Redundancy History State. Indicates milestones with respect to
redundancy-related activities like redundancy role states, compatibility states,
synchronization states, user commands, sync abort indication, and role change
indication. Set to dashes "- - -" when entry not yet initialized.

RDNHISTREASON - Redundancy History Reason. Optionally indicates rationale
for the occurrence of the associated RDNHISTSTATE entries. Includes reason for
loss-of-sync, redundancy role change, commencing initial sync, and partner
incompatibility. Set to dashes "- - -" when entry not applicable (or entry not yet
initialized).
R500
April 2017
Series 8 C300 Controller User's Guide
Honeywell
8. C300 Redundancy operation
8.7. Redundancy history
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