5. Series 8 I/O
Configuration Form Reference
5.3. Switchover and Secondary readiness
108
Series 8 I/O User's Guide
R500
Honeywell
April 2017
Figure 30 Defining redundancy from the Main tab
5.3 Switchover and Secondary readiness
A switchover describes the process where a Secondary Series 8 module assumes the
Primary state, and the Primary Series 8 module assumes the appropriate Secondary state
of readiness, depending upon what triggered the switchover. A switchover can be
triggered immediately upon the detection of a fault in the Primary or upon the receipt of
an operator command.
The ability of a Secondary Series 8 module to take over the assigned control functions of
the Primary depends upon which one of the following readiness states reflects its current
state.
Table 27 Redundancy state and module readiness
If Secondary redundancy state is
Then, the Secondary module
NotSynced
Not synchronized
Cannot assume the Primary state. This is a
state of non-readiness. Switchover has not
occurred. Ensure redundancy has been
selected on the IOMs Main tab.
FoInProg
SwapInProg
Synchronizing
Cannot assume the Primary State. In this state,
the Secondary module is copying database
information from the Primary.