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Maintenance
840 USE 106 00 January 2003 193
Replacing a Hot Standby Module
Hot Swap and the
Hot Standby
System
Hot swapping any key module in the Primary or Standby backplane forces that
backplane offline. When the module is in the Primary backplane, this causes
switchover.
Key modules include the controller, remote I/O head processor and the Hot Standby
module.
Any time you hot swap a module, you must cycle power to the backplane to ensure
proper system initialization. If you have hot swapped the controller, you must also
perform a program update, using the proper procedure.
You may replace a CHS 110 module while the Hot Standby system is running, as
long as the module is in the current Standby backplane and you follow the procedure
below
Hot swapping any key module in the Primary or Standby backplane forces that
backplane offline. When the module is in the Primary backplane, this causes
switchover.
Replacement
Procedure
The following table shows the replacement procedure.
CAUTION
Primary Backplane Hazard
Do not attempt to hot swap the CHS 110 module in the Primary
backplane.
Failure to follow this precaution can result in injury or equipment
damage.
Step Action
1 Power down the backplane.
2 Disconnect the fiber optic cable from the module and remove it from the
backplane.
3 Install the new module and reconnect the fiber optic cable.
4 Restore power to the backplane.