
3Ć58 Theory of Operation: Redundancy
Original Ć June 1990CE4.2:CL6211
3.6.6 Control Action After Switchover/Switchback
A switchover (or switchback) decision can be made by the RDCU, or can
be commanded by the operator via the RDCU diagnostic package. The
RDCU commands the controller subsystem to resume control, and the
controller subsystem then commands the output relays to switch to the
new active controller units. Switchover of the RDCU/controllers system
is designed to occur within one second of failure detection of any single
point failure.
The controller which resumes control will simply discard any tracking
communications in progress, and proceed on the next Function
Sequence Table (FST) execution with normal control processing. As
soon as the other controller unit (the new standby controller) becomes
available, the active controller resumes the inter-controller tracking
operation.
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