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Redundancy parameters
Enable Synchronization – ENBLSYNCCMD
Enable Synchronization – ENBLSYNCCMD
This command triggers an unsynchronized redundant module pair to attempt initial-
synchronization. Additionally, the module's Auto-Synchronization State transitions to
ENABLED (if previously set to DISABLED).
Disable Synchronization – DSBLSYNCCMD
This command triggers a synchronizing/synchronized/standby redundant module pair to
abort synchronization. Also, the module's Auto-Synchronization State to DISABLED.
Enable Standby – ENBLSTBYCMD
This command triggers a redundant controller pair in the Synchronization Maintenance
State to enter the Standby State. While in the Standby State, the secondary controller
contains a database that was previously synchronized with the primary controller but the
secondary is no longer receiving synchronization-data updates from the primary
controller. This command is useful for testing the expected behavior of a configured
control strategy if the redundant controller pair ever had to invoke the 'Go-Back to Idle'
option during a controller On-Process Migration. Specifically, after entering the Standby
State, issue the switchover command, and the controller with the stale database switches
into the primary role with the CEE execution state set to Idle. In the case where the
Standby State was achieved through the Enable Standby command, the Disable
Synchronization command exits the Standby State.
Auto-Synchronization State – RDNAUTOSYNC
Read-only parameter that reflects the current state of Auto-Synchronization as follows:
Enabled upon receipt of the Enable Synchronization command. When enabled, a
•
Primary Module automatically attempts to synchronize the Secondary, upon receipt
of any
Auto-Synchronization trigger
command).
Disabled either upon receipt of the Disable Synchronization command or detection
•
of a persistent synchronization fault condition (such as: end-to-end checksum failure,
synchronization hardware failure, etc.). When disabled, user must explicitly issue
the Enable Synchronization command to reset any persistent fault condition and
(re)attempt initial-sync.
Auto synchronization triggers
When the primary controller has its Auto Synchronization State parameter set to enabled,
the redundant controller pair automatically commences initial-sync without user
intervention. More specifically, any action that results in the primary detecting a direct
compatible partner module triggers an initial sync attempt. Such as:
194
(in addition to the Enable Synchronization
Experion C300 Controller User's Guide
Honeywell
R301.1
11/06
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Troubleshooting
