Schneider Electric 840 USE 106 0 manual IEC Applications, Needed to achieve it

Additional Guidelines for IEC Hot Standby

IEC Applications	1. There are 64K words of state RAM as a maximum for IEC HSBY Registers in an
Optimization,	IEC Hot Standby application. Using as little state RAM as possible for other
Continued	purposes besides IEC HSBY Registers, allows running medium sized IEC
	applications in IEC Hot Standby mode. When using the IEC application data very
	efficiently, the size of the application can grow from medium to large.
	2. To optimize an IEC application to consume as little memory as possible takes
	some effort and may reduce the maintainability of the application. Therefore you
	should always try to reduce data memory to what is needed. The efficient use of
	the State RAM, as described in the following section, should be considered
	whenever possible. It provides large data memory benefits compared to the work
	needed to achieve it.

154 840 USE 106 00 January 2003