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Additional Guidelines for IEC Hot Standby
160
840 USE 106 00 January 2003
Programmed
Logic, Continued
The only problem with logic programmed like that is, for every open pin there is as
much memory allocated as its data type requires. In this case there are 13 bytes of
unused memory allocated. To reduce those 13 bytes to just 1 byte means
connecting a constant to every open pin that makes the logic work as if the pin was
open. This is always equivalent to zero, or FALSE in this case.
Therefore, the logic should look like the diagram below.