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Using a Quantum IEC Hot Standby System
840 USE 106 00 January 2003 141
Memory/Scantime optimization
IEC State RAM
Map
An illustration of the IEC State RAM Map.
Header
(Exec vers.,
timing info,...)
prog. data
configured
Program data
used
Program data
unused
Safety buffer
for future
changes/
DFB instance
data
free memory
for addtl. DFB
instance data
No. 3x regs
configured for
IEC HSBY
Space as big as IEC heap
Total 4x Total 3x Total 1x Total 0x
Transfer buffer for IEC heap
State RAM
(compl. xferred)
additions