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Using a Quantum IEC Hot Standby System
840 USE 106 00 January 2003 133
Memory Partition
IEC HSBY
Registers
The number of IEC HSBY Registers (size of transfer buffer) is set to the maximum
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.
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
.
Concept shown