Schneider Electric 890USE17700 - Manual (Page 160)

Advanced Configuration Features
160 890USE17700 April 2004
Number of Reflex
Blocks on an
Island An island can support up to 10 reflex blocks. A nested reflex action consumes two
blocks.
An individual output module can support up to two reflex blocks. Supporting more
than one block requires that you manage your processing resources efficiently. If
you are not careful with your resources, you may be able to support only one block
on an action module.
Processing resources are consumed quickly when a reflex block receives its inputs
from multiple sources (different I/O modules on the island and/or virtual modules in
the NIM). The best way to preserve processing resources is to:
z use the always enabled constant as the enable input whenever possible
z use the same module to send multiple inputs to a block whenever possible