Schneider Electric 840 USE 106 0 manual Using, Extensions, Transfer from Primary to Standby

	Using a Quantum IEC Hot Standby System
Using the	The Configuration Extension offers two check boxes regarding Hot Standby. Since
Configuration	you are using the IEC environment, check the IEC Hot Standby check box.
Extensions	When exiting the Configuration Extension dialog with OK, the CHS Hot Standby
screen	loadable is automatically added to the project, but this requires the loadable being
	part of the Concept environment (refer to Loading the Software, p. 112). There is a
	second loadable with the name IHSB added as well. It is needed for the program
	transfer from Primary to Standby.
	In turn, when the IEC Hot Standby check box is unchecked, the CHS and IHSB
	loadables are removed from the project automatically.
	The following diagram shows the Configuration Extensions dialog box.
	Concept
	Configuration extensions dialog (IEC Hot Standby activated)

IEC Hot Standby ensures that the Primary and Standby controllers contain identical IEC applications so that backup is always available in case of a Primary controller failure. The configuration of the IEC Hot Standby must be done with the Hot Standby dialog.

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