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Using a Quantum IEC Hot Standby System
120
840 USE 106 00 January 2003
Enable Keyswitch Override
Keyswitch
Override
If both bits are set to 0, a switchover occurs and the former Primary backplane goes
offline. The new Primary backplane continues to operate.
A Software
Control Example
For example:
You have enabled the keyswitch override and set the operating mode of controller
B to Offline. Now the system is powered up and you want to put controller B in RUN
mode.
The keyswitch does not work, so you must rely on user logic. There are two ways
you can proceed.
CAUTION
Animation Mode or Reference Data Editor Hazard
If you use the animation mode or reference data editor (RDE) of
Concept to enable the keyswitch override while the Hot Standby system
is running, the Primary controller immediately reads bits 14 and 15 to
determine its own state and the state of the Standby.
Failure to follow this precaution can result in injury or equipment
damage.