Schneider Electric 840 USE 106 0 manual Steps to Upgrade Zoom or RDE PLC executives, While Hot

		Maintenance
Steps to Upgrade	Zoom or RDE
PLC executives
	Step	Action
while Hot
	1	Call up the Hot Standby command register, either in a Zoom screen or in the
Standby is
running		RDE. If you are using the Zoom screen, select the Without Stopping option for
		bit 12. If you are using the RDE, set the value of bit 12 in the Hot Standby
		command register to 1.
	2	Disconnect from the PLC and start the Firmware Loader Utility.
	3	Perform a firmware download to the standby controller.
	4	Do a program update from the Primary to the Standby controller as described in
		Using a Quantum 984 HSBY System, p. 67 or Using a Quantum IEC Hot
		Standby System , p. 109. At this point, you have a new system executive in the
		Standby controller with the correct ladder logic and state RAM values.
	5	Initiate a Hot Standby switchover.
	6	Perform a firmware download to the new Standby controller.
	7	Refer to Concept V 2.2 User’s Manual, 840 USE 483 00. Now both the Primary
		and the Standby controllers have the new system executive installed, and both
		are running the same logic program with the same state RAM values. If you
		initiate another switchover, the controller that was originally the Standby
		becomes the Standby again.
		Note: Some Exec upgrades may be because of new versions of Concept and
		in certain cases the project may have to be converted before downloading.
	8	Reconnect to the Primary controller and reset bit 12 of the Hot Standby
		command register back to 0 via either the Zoom screen or the RDE.

840 USE 106 00 January 2003 199