Schneider Electric 840 USE 106 0 manual IEC Heap, Program Data, Online -- Memory Statistics

	Theory of IEC HSBY Operation
IEC Heap	The most important new terms to understand in IEC Hot Standby are the IEC Heap,
	the Currently used IEC Heap Size and the Maximum IEC Heap Size.
Program Data
	The program data area has a default size of 16 KByte whenever a new Concept
Area	project is created. Its size may be adjusted to the amount of memory that’s really
	needed for a particular application. This can be done in the Memory Statistics Dialog
	while Concept is not connected to the PLC. This dialog can be activated through
	Online --> Memory Statistics.
	Configure size of program data area at the Memory Statistics dialog in offline mode.
	Note: Changing the configured size of the program data area results in a complete
	download of the application, no download changes are possible.
	The maximum size of the IEC heap is the maximum amount of memory available for
	data in any particular IEC application. What this means in terms of IEC HSBY is
	shown in the diagram in All State RAM transferred, p. 52.

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