Schneider Electric 840 USE 106 0 manual Replacing a Hot Standby Module, Primary Backplane Hazard

Maintenance

Replacing a Hot Standby Module

Hot Swap and the Hot swapping any key module in the Primary or Standby backplane forces that

Hot Standby	backplane offline. When the module is in the Primary backplane, this causes
System	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
		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.
	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
	The following table shows the replacement procedure.
Procedure
	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.

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