Schneider Electric 840 USE 106 0 manual Memory Partition, Registers

Using a Quantum IEC Hot Standby System

Memory Partition

IEC HSBY	The number of IEC HSBY Registers (size of transfer buffer) is set to the maximum
Registers	whenever the IEC Hot Standby configuration extension is activated the first time for
	a particular project. So after having the IEC Hot Standby configuration extension
	activated, the state RAM is fully occupied with the default values for 0x, 1x, 3x, 4x
	and the remaining maximum for IEC HSBY Registers (3x). The dialog that follows
	shows how the number of IEC HSBY Registers can be modified.
	The diagram below shows a PLC Memory Partition.
	Concept shown

Note: The higher the number of IEC HSBY Registers (IEC Hot Standby Data in the above dialog) the bigger the transfer buffer for the IEC heap and therefore the bigger the IEC application may be. See State RAM, p. 155.

840 USE 106 00 January 2003 133